GR-120
GR-200GR-300GR-202

1WMPD4000280A

Th is a hazard alert mark.

NOTEThis manual and/or the GR series balances may be changed at any time to improve the product without
notice.

© 2001 A&D Company Ltd. All rights reserved.
No part of this publication may be reproduced, transmitted, transcribed, or translated into any language inany form by any means without the written permission of A&D Company, Ltd.

The contents of this manual and the specifications of the instrument covered by this manual are subject tochange for improvement without notice.

Product names and company names mentioned in this manual are trademarks or registered trademarks of
their respective companies in Japan or other countries and regions.

Contents
1.1.
1.2.

Introduction .......................................................................................................................................... 5
Features ............................................................................................................................................ 5
Compliance with FCC Rules ............................................................................................................. 5

2.1.
2.2.
2.3.
2.4.

Caution ................................................................................................................................................. 6
Precautions for Installing the Balance .............................................................................................. 6
Cautions during Use (To Get Best Performance) ............................................................................. 7
Take Care of Your Balance ............................................................................................................... 8
Power Supply .................................................................................................................................... 8

3.1.
3.2.

Unpacking Your Balance ...................................................................................................................... 9
Installing Your Balance ................................................................................................................... 10
Display Symbols and Key Operation .............................................................................................. 10

1.

2.

3.

4.

Weighing Units ................................................................................................................................... 11

5.
5.1.
5.2.
5.3.

Weighing ............................................................................................................................................ 12
Basic Operation (Gram Mode) ........................................................................................................ 12Counting Mode (PCS) ..................................................................................................................... 13
Percent Mode (%) ........................................................................................................................... 13

6.1.
6.2.

Response Adjustment ........................................................................................................................ 14
Automatic Response Adjustment .................................................................................................... 14
Manual Response Adjustment ........................................................................................................ 15

7.1.
7.2.
7.3.
7.4.
7.5.
7.6.

Calibration .......................................................................................................................................... 15
Automatic Self Calibration .............................................................................................................. 17
Calibration Using the Internal Weight ............................................................................................. 17
Calibration Test Using the Internal Weight ...................................................................................... 18
Calibration Using an External Weight ............................................................................................. 19
Calibration Test Using an External Weight ..................................................................................... 20
Correcting the Internal Weight Value .............................................................................................. 21

8.1.
8.2.

Function Switch and Initialization ....................................................................................................... 22
Permission or Prohibition ................................................................................................................ 22
Initializing the Balance .................................................................................................................... 23

9.1.
9.2.
9.3.
9.4.
9.5.
9.6.

Function Table .................................................................................................................................... 24
Display and Keys of the Function Table.......................................................................................... 24
Details of the Function Table .......................................................................................................... 25
Explanation of Item "Environment, Display" ................................................................................... 27
Explanation of Item "Data output mode" ......................................................................................... 28
Explanation of Item "Data format"................................................................................................... 29
Examples of Data Format ............................................................................................................. 31

6.

7.

8.

9.

10.
ID Number and GLP Report............................................................................................................... 33
10.1.
Main Objectives .............................................................................................................................. 33
10.2.
Setting the ID Number .................................................................................................................... 33
10.3.
GLP Output ..................................................................................................................................... 34
11.
Data Memory Function....................................................................................................................... 39
11.1.
Use and the Method of Storing Data .............................................................................................. 39
11.2.
Preparation of the Function Table ................................................................................................... 40
11.3.
Enabling data memory function ...................................................................................................... 403

11.4.
11.5.

Output of Data from Memory .......................................................................................................... 40
Deleting All Data at One Time ......................................................................................................... 41

12.

Underhook ......................................................................................................................................... 41

13.

Specific Gravity (Density) Measurement ........................................................................................... 42

14.
Input and Output Interface ................................................................................................................. 46
14.1.
RS-232C Interface .......................................................................................................................... 46
14.2.
External Contact Input .................................................................................................................... 47
15.
Connection to Equipment................................................................................................................... 48
15.1.
Connection to AD-8127 Printer ..................................................................................................... 48
15.2.
Connection to AD-8121B Printer ................................................................................................... 48
15.3.
Connection to Computer ............................................................................................................... 50
16.
Commands ......................................................................................................................................... 52
16.1.
Command List ................................................................................................................................. 52
16.2.
Commands to Request Weighing Data .......................................................................................... 53
16.3.
Commands to Control the Balance ................................................................................................. 54
16.4.
Commands to Request Memory Data ............................................................................................ 55
16.5.
Acknowledge Code and Error Codes ............................................................................................. 56
16.6.
Control using CTS and RTS ........................................................................................................... 56
16.7.
Related Settings.............................................................................................................................. 56
16.8.
Command Examples....................................................................................................................... 57
17.
Maintenance ...................................................................................................................................... 60
17.1.
Treatment of the Balance................................................................................................................ 60
17.2.
Error codes ..................................................................................................................................... 60
17.3.
Other Display .................................................................................................................................. 61
18.
Specifications ..................................................................................................................................... 62
18.1.
External Dimensions ....................................................................................................................... 63
18.2.
Optional Accessories ...................................................................................................................... 64

4

1. Introduction
THANK YOU FOR YOUR A&D PURCHASEThis manual will tell you in simple language how this balance works and how to get the most out of it interms of performance.

1.1. Features
Built-in Calibration Weight (internal weight), used to calibrate and verify the calibration of yourbalance.
Automatic Self Calibration, using the built-in weight, adapting to changes in temperature.
Automatic Response Adjustment, adapting to vibration and drafts in the environment.
Data Memory Function, storing 200 weighing data.
Interval Memory Mode, storing weighing data periodically.
Good Laboratory Practices (GLP) data output using a serial interface.
Under Hook, for measuring specific gravity and magnetic substances.
The balance is equipped with the specific gravity measuring mode to calculate the specific gravity(density) of a solid.
Multiple Weighing Units, with most of the common units used around the world.
RS-232C serial interface, for transmitting data and controlling your balance.
Windows communication tools software (WinCT) to allow easy communication with a computer
using Windows. The current version of the WinCT can be downloaded from the A&D website.
Door Control Lever, a front mounted door control can easily open and close one of the side doors
if connected using the door joint.

1.2. Compliance with FCC Rules
Please note that this equipment generates, uses and can radiate radio frequency energy. Thisequipment has been tested and has been found to comply with the limits of a Class A computing device
pursuant to Subpart J of Part 15 of FCC rules. These rules are designed to provide reasonable
protection against interference when equipment is operated in a commercial environment. If this unit isoperated in a residential area it might cause some interference and under these circumstances the user
would be required to take, at his own expense, whatever measures are necessary to eliminate theinterference.
(FCC = Federal Communications Commission in the U.S.A.)5

2. Caution
2.1. Precautions for Installing the Balance
To ensure that you get the most from your balance, please try to follow these conditions as closely as
possible:
The best operating temperature is about 20°C / 68°F at about 50% Relative Humidity.
Try to ensure a stable power source when using the AC adapter.
Please warm-up the balance for at least one hour. Plug-in the AC
adapter as usual.
The weighing room should be free of dust.

OK

The weighing table should be solid and free from vibration, drafts(such as frequently opening doors or windows) and as level as
possible.
Keep the balance level by using the bubble spirit level.
Don’t install the balance near heaters or air conditioners.
Don’t install the balance in direct sunlight.
Don’t use the balance near other equipment which produces

Bubblespiritlevel

magnetic fields.
Corners of rooms are best as they are less prone to vibrations.
Calibrate the balance before using and after moving it to anotherlocation.
Do not place or use the balance where there is flammable orcorrosive gas present.

6

Leveling
footNG

2.2. Cautions during Use (To Get Best Performance)
For precise and accurate weighing, please take notice of the following.
Weighing errors may occur due to the influence of static electricity.
Note that if the ambient humidity drops below 45%RH, insulators

Chargedmaterialsuch as plastics are liable to have static electricity. Ground theMetal casebalance and perform the following as needed.
Eliminate the static electricity using the optional AD-1683A.
Increase the relative humidity at the place where the balance
is installed.
Weigh the sample in a conductive metal container or the like.

GroundWipe off charged materials such as plastic with a damp cloth
to suppress static electricity.
Influence of magnetism may cause weighing errors. Whenmeasuring magnetic materials (iron, etc.), keep the sample awayfrom the balance main body by means such as underhook weighing.
Weighing errors may occur if there is a difference between theambient temperature and temperature of the sample (and theMagnetic
material

container). For example, when the room temperature is 20°C,

Convection

convection occurs around a Petri dish or watch glass that is 40°C and20°C

the balance displays a value lighter than the actual weight. Before
weighing the sample and the container, try to acclimatize them to theambient temperature. Use tweezers when handling the sample.
Perform the weighing operation carefully and quickly. If
measurement takes a long time, error-inducing factors will
increase due to changes in temperature and humidity in theweighing chamber, air turbulence or reaction/humidity absorption
by the sample. It is advisable to use long tweezers to avoid
inserting your hands into the weighing chamber.
For weighing with 0.01 mg readability using the GR-202, it isadavisable to install the fine range breeze break ring in place of thebreeze break ring. (Refer to “3. Unpacking your balance”.) By installingit, the influence of air flow can be minimized.
When placing a sample on the weighing pan, do not drop it, or do notplace a sample greater than the balance weighing capacity. Place thesample in the center of the weighing pan.
When pressing keys, do not press with a sharp object such as a pen.
Instead, press the center of the key with your finger.
Be sure to press the RE-ZERO key before weighing in order toeliminate measurement errors.
Measurement results include error from air buoyancy. The buoyancy
of air varies depending on the sample volume, atmospheric pressure,temperature, and humidity. Correct the buoyancy for the most precise
measurement.
Prevent foreign substances such as powder, liquid, and metal pieces
from entering the balance.

7

Fine range
breeze break

40°C

2.3. Take Care of Your Balance
Don’t disassemble the balance. Contact your local A&D dealer if yourbalance needs service or repair.
Don’t use solvents to clean the balance. For best cleaning, wipe with a dry
lint free cloth or a lint free cloth that is moistened with warm water and amild detergent.
When you transport the balance, hold it as shown in the right illustration.
Never lift the balance using the weighing chamber frame.
Keep magnetic substance away from the balance.
Avoid mechanical shock to your balance.
Avoid dust and water so that the balance weighs correctly. Protect theinternal parts from liquid spills and excessive dust.
Remove and clean the floor plate of the weighing chamber.
Use the special shipping box supplied for transportation.

2.4. Power Supply
Do not remove the AC adapter while the internal mass is in motion, for example, right after the AC
adapter is connected, or during calibration using the internal mass.
If the AC adapter is removed under the conditions described above, the internal mass will be left
unsecured, that may cause mechanical damage when the balance is moved.
Before removing the AC adapter, press the ON:OFF key and confirm that zero is displayed inweighing mode.
When the AC adapter is connected, the balance is in the standby mode if the standby indicator ison (see "3.2. Display Symbols and Key Operation "). This is a normal state and does not harm thebalance. We recommend that you plug in your balance for at least an hour before use so it canwarm up.

8

3. Unpacking Your Balance
Unpack the balance carefully and keep the packing material if you want to transport the balance again in the
future. In the carton you should find this manual plus:
Weighing
Pan

BreezeBreak Ring

Weighing
Chamber
Dust Plate
Door Control Lever
A side door can be opened and closed
using the Door Control Lever when the
Door Joint is connected to a side door.

Floor Plate

Keys
Door
Joint
LevellingFoot

Display

Step
Card

Bubble Spirit
Level

Step
Card

Step Card

AC Adapter

Note

Serial Interface(RS-232C)

AC Adapter ID Lables

Grounding Terminal

External
Contact Input

AC Adapter
Jack

Please confirm that the AC adapter type is correct for your local voltage and receptable type.
Please use the dedicated AC adapter specified for the balance.
If you use the wrong AD adapter, the balance and other equipment may not operate properly.
93.1. Installing Your Balance
Step 1

Consider the section "2. Caution" for installing your balance.

Step 2Assemble the "Dust Plate", "Breeze Break Ring / Fine Range Breeze Break Ring" and "Weighing Pan" on
your balance. There is a reference illustration on the previous page.

Step 3Adjust the level of the balance using the leveling feet.

Step 4

Connect the AC adapter to the balance. Warm up the balance for at least one hour with nothing on theweighing pan.

3.2. Display Symbols and Key Operation
The amount of stored datawith memory data function

Response indicator

Processing indicator

Weighing data or
stored data

Stabilization indicatorStand-by indicator ofinterval memory function

Stand-by indicator
Displayed data number
Blinking indicators

Automatic selfcalibration notice

Active indicator of interval
memory function

There are two types of key operations: “press and release” and“press and hold”. The function of each key changes depending
on how the key is pressed. Do not press and hold a key unlessnecessary.
Key

Press (press and release) the key

Press
Press and(Press and release) holdPress and hold the key

Display ON / OFF key. The stand-by indicator is displayed, when the balance is turned off
with this key. Weighing data is displayed, when the balance is turned on with this key.
Readability of weighing data is

The function table menu is displayed. Refer tochanged.

section "9. Function Table".

Units are changed (selected from thefunction table). Refer to section "4. Response adjustment is performed.
Weighing Units".
This key performs calibration of the

Other items of the calibration menu arebalance using the internal weight.

displayed.

Weighing data is stored in the balance

Data memory menu or GLP menu is(Factory setting) or is output to the RS-

displayed. This key functions according to

232C

the function table. Factory setting is "notinterface.

This

key

functionsaccording to the function table.

used".

The key sets the display to zero. This key returns a weighing value to the center of zero
when the weighing pan is empty, and can also tare (cancel) the weight of container and/or
sample. Please use this key before each weighing to cancel possible error.
10

4. Weighing Units
The most common unit of weight used around the world is grams, but there is often a need to shift to analternative unit specific to the country where the balance is used or to select modes such as counting orpercent.
The unit can be select by the function table. The units are as follows (if some are missing, please refer to yourdealer):If a mode (or unit) of weight has been turned off, the sequence will be missing that mode or unit. There arealso the various Tael that can be included if necessary. (Tael is selected as a unit from four units installed at
the factory)

Note

If the law in your area permits, you may use all of the units, or at this software level you can disable theweighing units you don't regularly use. Also, some dealers may initially turn OFF units which are not regularly
used, but you may want to turn them back on.

Conversion table

Abbrev.
mg
oz
ozt
ct
mom
dwt
GN
TL
TL
TL
TL
t
mes

Name
Milli-gramOunce (Avoir)
Troy Ounce
Metric Carat
Momme
Pennyweight
Grain (UK)
Tael (HK general, Sing.)
Tael (HK, jewelry)
Tael (Taiwan)
Tael (China)
Tola (India)
Messghal

11

Conversion
0.001 g28.349523125 g
31.1034768 g
0.2 g
3.75 g1.55517384 g
0.06479891 g
37.7994 g
37.429 g
37.5 g31.25 g11.6638038 g
4.6875 g

Operation of unit selection

The unit can be selected in the function table. The sequence of displaying the unit can be arranged so as tofit the frequency of use in the function table. According to the sequence of displaying unit, the units can bechanged with the MODE key at the weighing mode.

Selecting a unit and arranging the sequence of display
Step 1
Step 2
Step 3
Step 4

Step 5
Step 6

Press and hold the RANGE key to bASFnc of the function table.
Press the RANGE key several times to display Unit.
Press the PRINT key to enter into unit selection.
The unit can be selected using the following keys.
The unit display sequence is in the order of pressing the RE-ZERO key.
MODE key:
The key to sequentially display the units.
RE-ZERO key: The key to select a unit. The
indicator is displayed at unit selected.
Press the PRINT key to store the units. Then the balance displays next menu id of the function
table.
Press the CAL key to exit the function table. Then the balance returns to the weighing mode.

5. Weighing
Cautions for the weighing operation
Operate your balance gently.

Press the RE-ZERO key to prevent possible error before placing material on the pan (weighing
material) each time.
Shorten the operation time as much as possible. (Opening and closing door, placing and removing
material)
Temperature changes during measurement may cause weighing error.
Use a pair of tweezers (pincette) to avoid a temperature change that is due to having your hand in
the weighing chamber.
Calibrate your balance periodically to maintain weighing accuracy. Refer to section “7. Calibration”.
Electrified material or magnetic body may cause a weighing error.
Do not press keys with a sharp instrument (such as a pencil or ball point pen).
Do not drop things on the pan, or place a weight on the pan that is beyond the weighing range ofthe balance.
Keep the area clean and dry.
Consider section "2. Caution” for weighing operation.

5.1. Basic Operation (Gram Mode)
Step 1

Calibrate your balance before use. (Refer to section “7. Calibration”)

Step 2

Place a container on the weighing pan, if necessary.
Press the RE-ZERO key to cancel net weight. The balance displays zero.
Container: A vessel placed on the pan, but not to be included in the weighing data.

Step 3

Place material on the pan or in the container.

Step 4

Wait for the stabilization indicator to be dislpayed and read the value.

Step 5

Remove the material and container from the pan.

12

5.2. Counting Mode (PCS)

Step 1

Selecting the counting mode

Select the unit "pcs" using the MODE key. If the counting mode can not be selected, refer tosection "4. Weighing Units". (pcs : pieces)

Storing a unit weight

Step 2Press the RANGE key to enter the sampling mode.

Step 3

If you want to select the number of items to be used for the sample, press the RANGE key (several
times). It may be set to 10, 25, 50 or 100.

Step 4

Place a container on the weighing pan, if necessary. Press RE-ZERO key to cancel this weight.
ex. 25

Step 5

pcs is displayed in the case of 25 items.

Place items on the pan. This number of items is the same quantity as the number displayed (10,25, 50 or 100).

Step 6

Wait for the stabilization indicator to come on. Press the PRINT key to calculate the unit weightand store it.

Step 7

Counting items

You are now able to count the items by placing them on the pan.

Counting mode using the ACAI function

ACAITM (Automatic Counting Accuracy Improvement) is a function that improves the accuracy of
the unit weight.
tep

8

If you add a few more items, the ACAI indicator turns on. (The ACAI indicator turns off if in
overload)

Step 9The balance re-calculates the unit weight while the ACAI indicator is blinking. Wait and do nottouch the items on the pan until the ACAI indicator turns off automatically.

Step10

You are now able to count items with a more accurate unit weight.

Step11

If you add a few more items, proceed to step 8.
The balance re-calculates a more accurate unit weight.

5.3. Percent Mode (%)
Step 1

Selecting the unit of percent mode

Select the unit%

using the MODE key. If the percent mode can not be selected, refer to section"4. Weighing Units". ( %: percent)

Storing 100% weight

Step 2Press the RANGE key to enter the sampling mode.

Step 3

Place a container on the weighing pan, if necessary.
Press the RE-ZERO key to cancel the container weight and possible error.
The balance displays

100 0 ..

Step 4

Place the item of 100% weight on the pan or in the container.

Step 5Press the PRINT key to store this 100% weight.

Step 6

Remove the item from the pan.
13

Step 7

Reading percentage

You are now able to read the percentage based on the stored 100% weight.

6. Response Adjustment
This function stabilizes the weight value, reducing the influence on weighing that is caused by drafts
and/or vibration at the place where the balance is installed. This function adjusts by automaticallyanalyzing the environment or by hand-operation. The function has three stages as follows:
Indicator
FAST
MID.
SLOW

Function
table

Cond 0Cond 1
Cond 2

Response Indicator
Summaries
Fast response, Sensitive value
Slow response, Stable value

Note




If the automatic response adjustment is too awkward, perform "Manual Response Adjustment".
The response adjustment can be changed at "Condition (Cond)" of "Environment & Display (bAsfnc)" in
the function table. Refer to "9. Function Table".

6.1. Automatic Response Adjustment
This way automatically updates the response adjustment by analyzing the influence of the environmenton the weight data.

Operation
Step 1Press and hold the MODE key until RESPONSE is displayed, and thenrelease the key.

Step 2The balance analyzes the influence and updates the response
adjustment. If you want to cancel this update, press the CAL key.

Caution

Do not allow vibration or drafts to affect the balance.

Step 3The balance returns to the weighing mode automatically and displays
the updated response indicator.

146.2. Manual Response Adjustment
This way updates the response adjustment manually.

Operation
Step 1Press and hold the MODE key until RESPONSE is displayed.

Press and hold
Press
again

Press the MODE key immediately.
Step 2

Select a stage of the response adjustment using the
MODE key. Either FAST or MID. or SLOW can be

Selectselected.
Step 3The balance automatically returns to the weighing mode aftera few seconds of inactivity.

Wait

7. Calibration
The GR series has the following modes concerning calibration and calibration test.
Automatic Self Calibration
Calibration using the internal weight
Calibration using an external weight
Calibration test using the internal weight
Calibration test using an external weight
Correction of the internal weight value

Note

Calibration is controlled by the parameters of "Permission or prohibition". Refer to section "8.
Function Switch and Initialization".
The weight which can be used for calibration is called "the calibration weight". The weight which
can be used for calibration test is called "the target weight". The weight which you have is called"the external weight".

CautionThis calibration achieves the adjustment for accurate weighing. It is necessary to perform calibrationin the following case.
• When the balance is installed for the first time.
• When the balance has been moved.
• When the ambient environment has changed.
• For periodical calibration.
Prevent vibration, drafts, and ambient temperature changes from the influence for the balance
during calibration.
This indicator means "the balance is measuring calibration data". Do not allow
vibration or drafts to affect the balance while this indicator is displayed.

15

The data for GLP (Good Laboratory Practice) can be output using the RS-232C interface, when the"GLP output (info)" of "Data output (dout)" is set to "1 " or " 2". Refer to section "9. Function
Table".

Caution using an External Weight

The accuracy of an external weight can influence the accuracy of weighing.
Product

Usable external weight

GR-120100 g, 50 g

GR-200200 g, 100 g

GR-300200 g, 300 g

GR-202200 g, 100 g

Adjustable range+15.9 mg – -15.0 mg

16

7.1. Automatic Self Calibration
This function automatically calibrates the balance, when the balance detects an ambient temperaturechange.
When the balance detects a change in ambient temperature, this indicator blinks
and automatic self calibration is required. If the balance is not used for several
minutes with this indicator blinking, the balance preforms automatic selfcalibration. The environment will affect the time that the indicator blinks.
This display means "the balance is measuring calibration data". Do not allow
vibration or drafts to affect the balance while this indicator is displayed.

Advice

You can use the balance while the indicator blinks. But, it is recommended that to maintain the best
accuracy, stop using the balance and confirm that there is nothing on the pan when the indicator starts
blinking.

Caution

Do not place anything on the weighing pan during automatic calibration.

Control of Automatic Self Calibration

Automatic self calibration is controlled by a parameter in "Permission or prohibition". Refer to section "8.

Function Switch and Initialization".

7.2. Calibration Using the Internal WeightThis function calibrates the balance using the internal weight.
Step 1Connect the AC adapter and warm up the balance for at least one hour with nothing on theweighing pan.

Step 2Press the CAL key to start calibration.

Step 3The balance displays

Cal in and performs calibration. Prevent vibration and drafts from

affecting the balance.
Step 4

If the "GLP output (info)" of the "Function Table" is set to "1" or "2", "Calibration Report" is output
from RS-232C interface.

Step 5The balance will automatically return to the weighing mode after calibration.

Step 6

Test the accuracy of weighing using the calibration test function or by using a certified test weight.

Control of this Calibration

Calibration using the internal weight is controlled by a parameter in "Permission or prohibition". Refer tosection "8. Function Switch and Initialization".
177.3. Calibration Test Using the Internal WeightThis function tests the balance accuracy using the internal weight.

Operation
Step 1Connect the AC adapter and warm up the balance for at least
one hour with nothing on the pan.

Step 2Press and hold theCAL

until displaying

CC inand thenPress and holdrelease the key.
Step 3The balance measures the zero point.
Prevent vibration and drafts to affect the balance.

Step 4The measured zero point data is displayed.

Step 5

Ready for the internal weight measurement.

Step 6The balance measures the internal weight.
Prevent vibration and drafts to affect the balance.
GLP output

Step 7The internal weight data is displayed.

Step 8The balance informs you when the calibration test is finished. If
the "GLP output (info)" of the "Function Table" is set to "1" or"2", "Calibration Test Report" is output by the RS-232C interface.

Step 9The balance will automatically return to the weighing mode after
the calibration test is finished.

18

7.4. Calibration Using an External WeightThis function calibrates the balance using an external weight. The weight to be used for calibration iscalled "the calibration weight". The weight which you have is called "the external weight".

Operation
Step 1Connect the AC adapter and warm up the balance for at least one hourwith nothing on the pan.

Step 2Press and hold the

CAL

key until displaying Calout and thenrelease the key
Step 3The balance displays

Press and holdCAl 0 .



If you want to change the calibration weight value,

If you use the stored calibration weight value in theproceed to step 4.
balance, proceed to step 5.
Step 4Press the RANGE key and adjust the calibration weight value
using the following keys.
RE-ZERO key... The key to set the value of the digit selected.
RANGE
PRINT

key ...... The key to select the digit to change value.
key ........ The key to store a new weight value andreturn to step 3.

Even if the AC adapter is removed, the data is
CAL

Note
Step 5maintained in non-volatile memory.
............
key
The key to cancel this change and return to step 3.

Product
Usable weight
Adjustable range
GR-120100 g, 50 g
GR-200200 g, 100 g+15.9 mg –-15.0 mg
GR-300200 g, 300 g
GR-202200 g, 100 g
Digits cyclically change using the RE-ZERO key.
ex. 0 mg+15 mg-15 mg0 mg

ex. calibration weightvalue = 200.0017g

Confirm that there is nothing on the pan and press the PRINT
key. The balance measures the zeropoint. Prevent vibration anddrafts from affecting the balance.

Step 6

Place the displayed calibration weight on the pan and press
the PRINT key. The balance displays the measured calibration
weight. Prevent vibration and drafts from affecting the balance.

Step 7

Remove the weight from the pan after the balance displays End.

Step 8

If the "GLP output (info)" of the "Function Table " is set to "1" orStep 9The balance will automatically return to the weighing mode after"2", "Calibration Test Report" is output by the RS-232C interface.
calibration.
Step10

GLP output

Test the accuracy of weighing using the calibration test function witha certified test weight.

Control of this Calibration

Calibration using an external weight is controlled by a parameter in "Permission or prohibition". Referto section "8. Function Switch and Initialization".
197.5. Calibration Test Using an External WeightThis function tests the balance for the accuracy using an external weight. A weight which is used for thecalibration test is called "the target weight". The weight which you have is called "the external weight".

Operation
Step 1Connect the AC adapter and warm up the balance for at least one
hour with nothing on the pan.
Press and hold

Step 2Press and hold the

CAL

key until displaying

Cal out andthen release the key.
Step 3The balance displays

CC 0 .

If you want to change the target weight value, proceed tostep 4.



If you use the stored target weight value in the balance,
proceed to step 5.

Step 4Press the RANGE key and adjust the calibration weight value using
the following keys.
RE-ZERO
RANGE
PRINT

key... The key to set the value of the digit selected.
key ...... The key to select the digit to change value.

key ........ The key to store a new weight value andreturn to step 3.

Even if the AC adapter is removed, the data ismaintained in non-volatile memory.

CAL

Note
Step 5

key ............ The key to cancel this change and return to step 3.

ex. target weightvalue = 200.0017g

Product
Usable weight
Adjustable range
GR-120100 g, 50 g
GR-200200 g, 100 g+15.9 mg –-15.0 mg
GR-300200 g, 300 g
GR-202200 g, 100 g
Digits cyclically change using the RE-ZERO key.
ex. 0 mg+15 mg-15 mg0 mg
Confirm that there is nothing on the pan and press thePRINT

Target weightkey.

The balance measures the zeropoint and displays it. Prevent
vibration and drafts from affecting the balance.
Step 6

Place the displayed target weight on the pan and press the

PRINT

key.

The balance displays the measured target weight and displays it. Prevent
vibration and drafts from affecting the balance.
Step 7

Remove the weight from the pan after the balance displays

Step 8

If the "GLP output (info)" of the "Function Table " is set to "1" orend .

"2", "Calibration Test Report" is output by the RS-232C interface.
Step 9The balance will automatically return to the weighing mode after
calibration.

20

GLP output

7.6. Correcting the Internal Weight Value
The balance can correct the internal mass value

Weighing the same weight

within the range shown below. This function corrects

200g

the internal mass value to conform to an external
weight. The corrected mass value is maintained in
non-volatile memory even if the AC adapter isremoved.
Model

TargetGR-120100.0000 g

GR-200GR-300200.0000 g

200.0000 g
The internal weight is corrected to +0.6 mg.
The balance is calibrated with the internal weight.

Range

200g

200.0006 g±1.5 mg

Corrected external weight

GR-202

Operation
Step 1

Turn off the display using the ON:OFF key.

Step 2Press the ON:OFF key while the RANGE key and PRINT key
are pressed and held. Then the balance displays

p5.

Step 3Press the PRINT key. Then the balance displays the switches.

Step 4

Set the following switches to " 1".
RANGE key ........... The key to select the switch to change the setting.
RE-ZERO

key ........ The key to select the setting of the switch.
Switch for the functionx x x

Switch for the internal weight
Step 5Press the PRINT key to store the new setting. The balance will returnto the weighing mode.

Step 6

Press and hold the RANGE key to enter the function table
and release the key when

Step 7ba5fnc is displayed.
Press the RANGE key several times to display C5 in .

Step 8Press the PRINT key to enter into the procedure for correcting
the internal weight value.

Step 8Correct the internal weight value using the following keys.
RE-ZERO key ........ The value is selected. (+1.5 mg – -1.5 mg)

PRINT key .................The new value is stored and id. is displayed
CAL key ................. This correction is canceled and id is displayed.

Step 9Press the CAL key. The balance will return to the weighing mode.

Step10Press the CAL key to calibrate the balance.

Control of the Correction

Correction of the internal weight value is controlled by the parametersin "Permission or prohibition". Refer to section "8. Function Switch andInitialization"

21

Press and holdPress

8. Function Switch and Initialization
8.1. Permission or Prohibition
The balance stores parameters that must not be changed carelessly (ex. Calibration data for precision
weighing, Data for adapting to environment, Control data for RS-232C interface, etc.). There are fiveswitches for the purpose of preserving these parameters. Each switch can select either "permission" or"prohibition". The "prohibition" protects careless operation.

Switches(Factory setting)

Function Table

0 To inhibit change to the function table.
1 To permit change to the function table.

Calibration with the Internal Weight0 To inhibit calibration.
1 To use calibration.

Calibration with an External Weight0 To inhibit calibration.
1 To use calibration.

Automatic Self Calibration
0 Not used
1 UsedCorrecting the Internal Weight0
1

To inhibit correction.
To use correction.

Operation
Step 1

Turn off the display using the ON:OFF key.

Step 2Press the ON:OFF key while the RANGE key and PRINT key are pressed and held. Then thebalance displays

p5.

Step 3Press the PRINT key. Then the balance displays the switch settings.

Step 4

Set the switches using the following keys.
RANGE

key

RE-ZEROPRINT
CAL

key The key to change the setting of the switch.

key

key

The key to select the switch to change the setting.
The key to store the new setting.
The key to cancel this operation.

22

8.2. Initializing the BalanceThis function returns the following parameters to factory settings.
Calibration data.
Function table.
The 100% weightThe data that is stored in the balance using data memory function.
External calibration weight and target weight.
Switch settings for "Permission or prohibition".

Operation
Step 1

Turn off the display.

Step 2Press the ON:OFF key while the RANGE key and PRINT
key are pressed and held. Then the balance display

p5

Step 3Press the RANGE key to display

Step 4Press the PRINT key. (If you want to cancel this operation,

Clr.

press the CAL key)

Step 5Press the RE-ZERO key.

Step 6

Press the PRINT key to initialize the balance. The balance
will automatically return to weighing mode.

23.

Press and holdPress

9. Function Table
The operation of the "Function Table" is to read or rewrite the parameters that are stored in the balance.
These parameters are stored until the next change, even if the AC adapter is removed.
The function table menu consists of two layers. The first layer is the "Class" and second layer is the"Item". Each Item stores a parameter. The effective parameter is the last parameter that is displayed in
the sequence. New parameters operate upon the balance after pressing the PRINT key.

Structure and Sequence of the Function Table

This example sets "use" to "Data memory" and"every minute" to "Interval time".

Start, From weighing

Item“Data memory”

Press and holdPress several times

Class

Parameter
“Use”

Item
Parameter

Press several times “Every minute”

Caution

End,

To

Item
“Interval time”

weighing

The balance may not work effectively when a combination of parameters and environment are notproper. Confirm the parameter before changing it.

Control of this Function Table

The function table is controlled by a parameter in "Permission or prohibition". Refer to section "8.
Function Switch and Initialization".

9.1. Display and Keys of the Function Table
The " " symbol is displayed at a selected parameter.
When the key is pressed and held in weighing mode, the balance enters the "function
table mode". The key to change the class or item in the function table mode.
The key to select the parameter, when the balance displays an item.
The key to move to an item from the class, when the balance displays a class. The key
to store new parameters and display the next class, when the balance displays an item.
The key to cancel new parameters and display the next class, when the balance displays
an item. The key to exit the function table mode, when the balance displays a class.

24

9.2. Details of the Function Table
Class

Item

Cond

Condition

5t-b

Stability band
width
ba5fncEnvironment,
Displaytrc

Zero tracking

5pd

Display update
rate

pnt

Decimal point

p-on

Automatic start

Parameter

0
1
2
0
1
2
0
1
0

Fast response, Sensitive value

1

Fast, 10 times/second

0
1
0
1

Point ( . )0Key mode1
prt
Data output
mode

2
3

Slow response and stable value
Stable when within ±1 digit
Stable when within ±3 digit
OFF
ON
Normal, 5 times/second

Comma ( , )OFF

Auto-print mode A (Standard
value is zero)Auto-print mode B (Standard
value is last stable value)
Stream mode /Interval memory mode

21000 digit

data

0

Data memory
function

Not used

1

Use

0
1
2
3
4
5
6
7
8
0
1
0
1

Every Measurement
Every 2 seconds
Every 5 seconds
Every 10 seconds
Every 30 seconds
Every 1 minute
Every 2 minutes
Every 5 minutes
Every 10 minutes
No output
OutputNo pause
Pause (1.6 seconds)

ap-b
Auto-print
difference for mode
A or B

int
Interval time for
Data memory
functiond-no
Data number output

pU5e
Data pause
Note: "Digit" is the unit of readability.

2

The stability indicator lights
when the display fluctuation iswithin the range per second.

The period to refresh thedisplay.
The form of decimal point.
Connecting adaptor, the display
turns on without key operation.

ON

0
1

Auto-print polarity
for mode A or B

01

Common data of "Response
adjustment".

The function to keep zerodisplay by tracking zero-drift.

Plus polarity
Minus polarity
Both polarities (Absolutevalue)
10 digit
100 digit

ap-p

dout
Data output

Summaries

Factory setting.
25

Data is output or stored with
PRINT key and stability indicator.
Data is output or stored when
the display value is stable andmeets the conditions of ap-p,
ap-b and standard value.
In case of data 0, data is output
continuously.
In case of data 1, data memory
function is used.
Display value ≥ Standard valueStandard value > Display value
Display value ≥ Standard value orStandard value > Display value
Difference between standard
value and display value

Relation: prt, ,int, d-no

Interval time is selected on
prt 3, data 1

Refer to section "11. Data
Memory Function".
Selection of output interval.

ClassItem

at-fAuto feed
dout
Data output

info
GLP output

ar-d
Zero after output

bp5
baud rate

btpr
Length, Parity bit

Crlf
Terminator
5if
SerialInterface

type
Data format

t-Up
Receive time

erCd
<AK> and error
code

Parameter

0
1
0
1
2
0
1
0
1
2
3
4
0
1
2
0
1
0
1
2
3
4
0
1
0

1
0

Ct5

d5 fncDensity fun
ction

Summaries
Not usedUse
No output
AD-8121 format
Data format
Not usedUse
600 bps
1200 bps
2400 bps
4800 bps
9600 bps
7 bits, even parity check
7 bits, odd parity check
8 bits, no parity check
CR LF
CR
A&D standard format
DP format
KF format
MT format
NU format
No limit
For one second
No output
OutputSelection of paper feed after
printing.

Not usedUsing CTS and RTS

Keep the RTS line (active) highwhile the computer receives
data.
CTS low will be set if it is busy.

CTS control

1

ldin

0

Liquid density inp
ut

Water temperature

1

Liquid density

Unit
Unit

Refer to section "4. Weighing Units"

C5 in
Correction of internal weight

Refer to section "7. Calibration"id

ID number

Caution

The GLP data output.
Function to automatically re-zeroafter data output.

CR: ASCII code 0Dh
LF : ASCII code 0Ah
Refer “9.5. Explanation of Item
"Data format"”.

Waiting time during a command.
AK: ASCII code 06h

Available only when density
mode is selected.

Refer to section "10. ID Number and GLP Report "Factory setting.

When the baud rate is set to 2400bps or less, the output rate is slower than the display update rate
and the balance may not transmit the data completely (and transmits it intermittently).
26

9.3. Explanation of Item "Environment, Display"
Condition ( Cond )Cond 0This parameter is for sensitive response to the fluctuation of a weight value.
Use for target weighing of powder, weighing of a very light sample or weighing requiring
quick response.

Cond 2This parameter is for stable weighing with slow response.
Use to prevent a weight value from drifting depended on the balance location.

Stability band width ( 5t-b )This item controls the width to regard a weight value as a stable value.
When the fluctuation per second is less than this parameter, the balance displays the stability indicatorand outputs or stores the data. This parameter influences the "Auto-print mode"

5t-b 0This parameter is for sensitive response of the stability indicator.
Use for exact weighing.

5t-b 2This parameter ignores slight fluctuation of a weight value.
Use to prevent the weight value from drifting.

Zero tracking ( trc )This function traces zero point drift and keeps a zero display automatically, when the weighing value
drifts due to changes in the environment.

trc 0

The tracking function is not being used.
Use for weighing of a very light sample.

trc 1

The tracking function is used.

Display update rate ( 5pd )The display update rate influences "Baud rate", "Data pause" and "Stream mode".

Decimal point ( pnt)

The decimal point form can be selected.

Automatic start ( p-on)

When the AC adapter is connected, weighing is automatically started without key operation. Use for abuilt-in balance in a system. Warm-up for at least one hour is necessary for accurate weighing.

27

9.4. Explanation of Item "Data output mode"
The PRINT key can be used at any time for transmitting data.

Key Mode

When you press the PRINT key and the display value is stable, the balance outputs the weighing data
and the display blinks one time.
Required setting dout
prt 0
Print key mode

Auto-Print Mode A

When the display value is stable and meets the conditions of "Auto-print polarity", "Auto-print band" andstandard value (of zero point), the balance outputs the weighing data. If you press the PRINT key , thebalance outputs the data and the display blinks one time.
Required setting dout
prt 1
Auto-print mode A

Example

dout

ap-p

Auto-print polarity

dout

ap-b

Auto-print band

"The ar-d 1 (zero after output) is set. A sample is placed and removed for weighingeach time."

Auto-Print Mode B

When the display value is stable and meets the conditions of "Auto-print polarity", "Auto-print band" andstandard value (of last stable value), the balance outputs the weighing data. If you press the PRINT key,
the balance outputs the data and the display blinks one time.
Required setting dout
prt 2
Auto-print mode B

Example

dout

ap-p

Auto-print polarity

dout

ap-b

Auto-print band

"Transmitting the data of each operation."

Stream Mode

The balance outputs the weighing data continuously.
Required setting dout
prt 3
Stream mode

ExampleCautiondout

data 0

Data memory function is not used.

ba5fnc5pd

Display update rate

5if

bp5

Baud rate"Monitoring data on a computer"

When the baud rate is set to 2400bps or less, the display update rate is faster than the output rate
and the balance may not transmit the data completely (and transmits it intermittently).

Interval Memory Mode

This is the data memory function mode. Weighing data is periodically stored in the balance. The interval
memory mode can not be used, while stream mode is used.
Required setting dout
prt 3
Interval memory mode

Exampledoutdata 1

Data memory function is used.

dout

int

Interval time

"Periodical weighing without computer command and outputting all of the data to acomputer at one time"28

9.5. Explanation of Item "Data format"
A&D standard format

5iftype 0This format is used when the peripheral equipment is capable of receiving A&D format. If an AD-8121

is used, set the printer to mode 1 or 2.
This format consists of fifteen characters (excluding the terminator).
A header of two characters indicates the status of the stability.
The plus sign is placed before the data, when the data is zero or positive.
The weight data uses leading zeros.
The unit has three characters.
S T ,

+

0

0 0

Header. 1

2

7

g CR LF

8

Data

Unit

S T Stable header
U S Unstable header
O L Overload header

Q

T

Terminator

Stable header for counting mode

D.P. (Dump print) format

5iftype 1This format is used when the peripheral equipment can not process the A&D format. If an AD-8121 isused, set the printer to mode 3.
This format consists of sixteen characters (excluding the terminator).
A header of two characters indicates the status of the stability without overload.
The polarity sign is placed before data, if not zero or overloaded.
The weight data has spaces in place of the leading zeros.
The unit has three characters.

W TT

+

Header0 .

1 2

g CR LF

7 8

Data

Unit

W T Stable header
U S Unstable header

Q T

Terminator

Stable header for counting mode

KF format

5iftype 2This is the Karl-Fischer moisture meter format, and is used when the peripheral equipment can only
communicate using this format.
This format consists of fourteen characters (excluding the terminator).
This format has no header characters.
The polarity sign is first, if not zero or overloaded.
The weight data uses spaces in place of leading zeros.
This format outputs the unit "g" only for a stable value.
+

0 .
Data

1

2

7

8

g
Unit
g

CR LF

Terminator
Stable value
Unstable value29

MT format

5iftype 35if

type 4dout

d-no 1This format has a two character header.
The polarity sign is used only for negative data.
The weight data uses spaces in place of the leading zeros.
The character length of this format changes dependent upon the unit.
S

0 .
Header

S
S
S

1

2 7

8

Data

g CR LF
Unit

Terminator

Stable header
D Unstable header
I Overload header

NU (numerical) format

This format has only numerical data.
This format consists of nine characters (excluding the terminator).
The polarity sign is first.
The weight data uses leading zeros.
+ 0
+

0 0

.

1 2

7 8 CR LF

Data

Terminator

Data number format

This data number format is output just before data is transmitted to the RS-232C interface.
This format consists of six characters (excluding the terminator).

N

o

. 0 0

Data number

1 CR LF
Terminator

30

9.6.
StableUnstable

Overload(Positive error)

Overload(Negative error)

Data number

Examples of Data Format
A&D S T , + 0 0
DP W T
KF
0 .
+
S
MT
NU + 0 0 0 . 1

A&D U S ,DP U SKF
1
MT S D
NU
0 1 8

0
+
1
0
2

.
0
2
.
7

1 2 7 8. 1 2 7 8g
7 8
1 2 7 88 CR LF

g CR LF
g CR LF

CR LF

g CR LF

g CR LF
0 1 8 . 3 6 9 0
g CR LF
1 8 . 3 6 9 0
CR LF
8 . 3 6 9 0
CR LF
g
1 8 . 3 6 9 0
CL. 3 6 9 0 R F

A&D O L , + 9 9 9 9 9 9 9 E + 1 9 CR LF
CR LF
DP
E
C
L
KF
H
R F
MT S I + CR LF
NU+ 9 9 9 9 9 9 9 9 9 CR LF

A&D O L ,9 9 9 9 9 9 9 E + 1 9 CR LF
CR LF
DP
E
C
L
KF
L
R F
CR LF
MT
S I
NU
9 9 9 9 9 9 9 9 9 CR LF

N o.

0 0 1 CR LF

S T , +

0

0 0

. 1 2

Space, ASCII 20h
CR
LF

Carriage Return, ASCII 0Dh
Line Feed, ASCII 0Ah

31

7

8

g CR LF

UnitsSymbolA&D

D.P.

Gram mode
Milligram mode
Counting mode
Percent mode
Ounce (Avoir)
Troy Ounce
Metric Carat
Momme
Pennyweight
Grain
Tael (HK general, Sing.)
Tael (HK, jewelry)
Tael (China)
Tael (Taiwan)
Tola (India)
MessghalDensitySpace, ASCII 20h

32

KF

MT

10. ID Number and GLP Report
10.1.Main Objectives
The ID number is used to identify the balance when Good Laboratory Practice (GLP) is used.
The ID number is output on the "Calibration Report", "Calibration Test Report" and "Title block".
The GLP output format is selected at the "GLP output (info)" of the "Function Table".
The balance can output the following reports for GLP.
"Calibration Report" of the calibration using the internal weight.
"Calibration Report" of the calibration using an external weight.
"Calibration Test Report" of the calibration using the internal weight.
"Calibration Test Report" of the calibration using an external weight.
"Title block" and "End block" for weighing data.

10.2.Setting the ID Number
Step 1Press and hold the RANGE key to display

Step 2Press the RANGE key several times to display

Step 3Press the PRINT key. You can set the ID number using the following keys.
RANGE

key

RE-ZEROba5fnc .
id .

The key to increment the digit.

key

The key to select the character of the digit. Refer to the following table forthe "Display Character Set".

CAL

key

PRINT

key

The key to cancel the new ID number and display

ba5fnc .

The key to store the new ID number and display

ba5fnc .

Display Character Set

Step 4With

ba5fncdisplayed, press the CAL key to return to the weighing mode.

33

10.3.GLP Output
Set the following parameters to output the report.
If the report is printed, set the "GLP output (info)" to "1". The AD-8121B printer is used in this
explanation. Refer to "15.2. Connection to AD-8121B Printer". The AD-8121B uses MODE 3.
The report is output to the RS-232C interface of a computer, set the "GLP output (info)" to "2".

Calibration report using the internal weight
Key operation
Step 1Press the CAL key to display

Step 2

If the calibration report is output,

Cal in . The balance calibrates automatically.

Step 3The balance returns to the normal weighing mode automatically.

glp

is displayed and the GLP data is output.

AD-8121B format

Data format

info 1

info 2
Manufacturer
Model
Serial number
ID
Date
Time
Calibration type
Signature: Space, ASCII 20h<TERM> : Terminator, CR LF or CR
CR : Carriage return, ASCII 0Dh
LF : Line feed, ASCII 0Ah

Example of GR-200

34

Calibration test report using the internal weight
Key operation
Step 1Press and hold the CAL key until displaying

Step 2The balance displays

Step 3The zero point is measured and this value is displayed.

Step 4The internal weight is measured and this value is displayed.

Step 5

If the calibration test report is output,

Step 6The balance returns to the weighing mode automatically.

CC

CC in . Release the key.

and performs the calibration test automatically.

glp

is displayed and the GLP data is output.

Command operation
Step 1

Transmit the TST command to the balance.

Step 2The balance performs the calibration test automatically.

Step 3

If the calibration test report is output, the GLP data is output.

Step 4The balance returns to the weighing mode automatically.
AD-8121B format

Data format

info 1

info 2
Manufacturer
Model
Serial number
ID
Date
Time
Calibration test type
Zero point result
Loaded weight result
Target weight used

Signature

Example of GR-200: Space, ASCII 20h<TERM> : Terminator, CR LF or CR
CR : Carriage return, ASCII 0Dh
LF : Line feed, ASCII 0Ah

35

Calibration Report using an external weight
Key operation
Step 1Press and hold the CAL key until displaying

Step 2The balance displays

Calout . Release the key.

Cal 0 .

If you want to change the calibration weight value, proceed to step 3.
If you use the stored calibration weight value in the balance, proceed to step 4.
Step 3Press the RANGE key and adjust calibration weight using the following keys.
RANGE

key

RE-ZERO
PRINT
CAL

key

key

key

The key to select the digit to change value.
The key to set the value of the digit selected.
The key to store a new weight value and return to step 2.
The key to cancel this change and return to step 2.

Step 4Press the PRINT key. The zero point is measured and this value is displayed.

Step 5

Place the calibration weight on the pan and press the PRINT key. The weight is measured and thisStep 6

Remove the weight afterStep 7

If the calibration report is output,

Step 8The balance returns to the weighing mode automatically.

value is displayed.
end

is displayed.
glp

is displayed and the GLP data is output.

AD-8121B format

Data format

info 1

info 2
Manufacturer
Model
Serial number
ID
Date
Time
Calibration type
Calibration weight
Signature

Example of GR-200: Space, ASCII 20h<TERM> : Terminator, CR LF or CR
CR : Carriage return, ASCII 0Dh
LF : Line feed, ASCII 0Ah

36

Calibration Test Report using an external weight
Key operation
Step 1Press and hold the CAL key until displaying

Step 2The balance displays

CC out . Release the key.

CC 0 .

If you want to change the target weight value, proceed to step 3.
If you use the stored target weight value in the balance, proceed to step 4.
Step 3Press the RANGE key and adjust target weight using the following keys.
RANGE

key

RE-ZERO
PRINT
CAL

key

key
key

The key to select the digit to change value.
The key to set the value of the digit selected.
The key to store a new weight value and return to step 2.
The key to cancel this change and return to step 2.

Step 4Press the PRINT key. The zero point is measured and this value is displayed.

Step 5

Place the calibration weight on the pan and press the PRINT key. The weight is measured and thisStep 6

Remove the weight afterStep 7

If the calibration test report is output,

Step 8The balance returns to the weighing mode automatically.

value is displayed.
end

is displayed.
is displayed and the GLP data is output.

glp

AD-8121B format

Data format

info 1

info 2
Manufacturer
Model
Serial number
ID
Date
Time
Calibration test type
Zero point result
Loaded weight result
Target weight used

Signature

Example of GR-200: Space, ASCII 20h<TERM> : Terminator, CR LF or CR
CR : Carriage return, ASCII 0Dh
LF : Line feed, ASCII 0Ah

37

Title Block and End Block
Use

When a weight value is recorded as the GLP data, the GLP report can put the weighing value between"Title block" and "End block".

CautionIf data memory function is used, the "Title block" and "End block" cannot be output. Use MODE 3 of
the AD-8121.

Key operation
Step 1Press and hold the PRINT key to display

Step 2The weighing data is output.

Step 3Press and hold the PRINT key to display

start

and release the key. The "Title block" is output.

recendand release the key. The "End block" isoutput. The "Title block" and "End block" are output alternately by pressing the PRINT key.
AD-8121B format

Data format

info 1

Title block
Manufacturer
Model
Serial number
ID
Date
Time

Weight data

Time
Signature

End block: Space, ASCII 20h<TERM> : Terminator, CR LF or CR
CR : Carriage return, ASCII 0Dh
LF : Line feed, ASCII 0Ah
38

info 2

11. Data Memory Function
11.1.Use and the Method of Storing Data
The data memory function can store 200 sets of weighing data. If the power switch is turned off, AC
power is interrupted or the AC adapter is removed, the data is maintained in non-volatile memory.
It is not necessary that the printer or computer be continually connected to the balance, because thebalance stores the weight data in memory.
There are four types of operating modes to store the data.
Key Mode

When you press the PRINT key and the display value is stable, thebalance stores the weighing data.

Auto-Print Mode A

When the display value is stable and meets the conditions of "Auto-print
polarity", "Auto-print band" and standard value (of zero point), thebalance stores the weighing data.

Auto-Print Mode B

When the display value is stable and meets the conditions of "Auto-print
polarity", "Auto-print band" and standard value (of last stable value), thebalance stores the weighing data.

Interval Memory Mode

Weighing data is periodically stored in the balance. This mode can bestarted or stoped using the PRINT key.

The data number can be appended just before the weighing data. (This is the serial number of the data
in memory.)

Symbols

The amount ofdata in memory
Full memory

Display ofweighing

Current data number

Display of data inmemoryInterval memory modeStandby indicatorInterval memory mode
Operation indicator

CautionWhen weighing data is being placed in memory, the data can be not output to the RS-232C interface.

The "fUl" means full memory. More data can be not stored until deletion of the stored data.
Automatic self calibration can not be used while the interval memory mode is working.
The following commands can not be used during data storage.
Q

Query command for weighing data.

S

Request command for stable weighing data.

SI

Query command for weighing data.

SIR

Request command for continuous weighing data.

3911.2.Preparation of the Function Table
Item

Mode
Key mode

Data output
mode
prt 0

Data memory
function

Auto-print polarity

Interval time—Auto-Print Mode A

prt 1

ap-p 0 – 2

Auto-Print Mode B

prt 2

ap-b 0 – 2Interval Memory Mode

prt 3

Not used data number

d-no 0Use data number

d-no 1—

data 1

int 0 – 8—Note

The data memory function does not work with data 0.

11.3.Enabling data memory function
Step 1Press and hold theRANGE

Step 2Press theRANGE

key several times to display

key until

dout .

Step 3Press thePRINT .

Step 4Press theRANGE

key three times to display

data 0 .

Step 5Press theRE-ZERO

Step 6

Press thePRINT

Step 7

Press theCAL

key to changeof the function table is displayed.

ba5fncdata 0todata 1 .

key to save a new parameter.

key to return to the weighing mode.

11.4.Output of Data from Memory
Displaying and Transmitting the Data
Step 1Press and hold thePRINT

Step 2Press thekey to enter the mode. Use the following keys.

PRINT

RE-ZERO

key until displaying

reCalland release the key.

key ...... The key to proceed to the next data.

MODE

key ........... The key to go back to the previous data.

PRINT

key ........... The key to transmit the current data to the RS-232C interface.

RANGE

key ........ While holding down the RANGE key, press the

CAL

key to delete thecurrent data..
CAL
Step 3Press thekey ............... The key to exit the
CAL

reCallTransmitting All data at One Time
Step 1mode.

key. The balance returns to weighing mode.

Setup the RS-232C interface using "" of the function table. Refer to “9. Function Table” and5if“15. Introduction”.
Step 2Press and hold theStep 3Press theRANGE

key to display

Step 4Press thePRINT

key to enter this mode.

Step 5Press theRE-ZERO

Step 6

Press thePRINT

Step 7The balance displays Clear

Step 8Press the

CAL

PRINT

key until displaying

reCalland release the key.

out .

key. Then the balance displaysout go .

key to transmit all data to RS-232C interface.
after the finish.

key to return to weighing mode.
40

The Data Number

When the "Data number output (d-no) “ is set to “1 ” and the data that is stored in the balance memory

is to be output, the "Data number" can be appended just before each data. This format consists of six
characters (excluding the terminator).

11.5.Deleting All Data at One Time
Step 1Press and hold the PRINT key until displaying

reCallStep 2Press the RANGE key several times to display

Clear .

Step 3Press the PRINT key to enter this mode.

Step 4Press the RE-ZERO key. Then the balance displays

Step 5Press the PRINT key to delete all data.

Step 6The balance displays

Step 7

Press the CAL key to return to weighing mode.

reCalland release the key.

Clr go .

after the finish.

12. Underhook
The underhook can be used for weighing large items, magnetic material or density measurement.
The built-in underhook is behind the plastic cap on the under-side of the balance.

CautionWhen not using the underhook, attach the plastic cap to prevent dust from getting into the balance.

The underhook can only be used to support items within the weight range of the balance. Do not
overload it.
Operate the underhook gently.
Underhook

Cap

Screw

41

13. Specific Gravity (Density) Measurement
GR series balances are equipped with the specific gravity measuring mode. It calculates the density ofa solid according to the weight of the sample in air and weght in liquid.
The specific gravity measuring mode is not ready for use upon receiving the balance. To use the mode,change the function table and activate the specific gravity measuring mode.
Two ways to set the density of a liquid are available:
by entering the water temperature and by entering the density directly.

Formula to obtain the density

The density can be obtained by the following formula.
A
ρ=
x ρ0
A B
ρ:

Density of sample

A:

Density of sample in air

B:

Weight of sample in liquid

ρ0:

Density of liquid(1) Changing the function table1

Setting the specific gravity measuring mode
The specific gravity measuring mode is available as one of the units. To use the mode, select it in thefunction table. For how to select the specific gravity measuring mode, see “Selecting a unit andarranging the sequence of display” in “4. Weighing Units” (Select2

Unit d)Selecting the way to set the density of a liquid
Select the liquid density method from the function table below. The function table is available only when
the specific gravity measuring mode is selected. For how to select, see “9. Function Table”.
Class
d5 fncSpecific gravity
measuring mode

Item

Parameter

Summaries

ldin0Enter the water temperature.

Liquid density

1

Enter the density directly.

Factroy setting(2) Setting the density of a liquid(3) 1

Press theMODE

key as necessary to select the specific gravity measuring mode.

When the processing indicator (upper left

) flashes with the unit “g” displayed, it indicatesthat the specific gravity measuring mode is selected.

2

In the specific gravity measuring mode, press and hold the MODE key to enter the mode to set the liquiddensity.

Note

In the normal weighing mode, the same procedure will activate the automatic response adjustment. Thisfunction is not available in the specific gravity measuring mode.

42

(4) Entering the water temperature （ldin 0）
In the specific gravity measuring mode, press and hold theMODE

key until thewater temperature currently set (unit: °C, factory setting: 25°C) is dsiplayed. Use
the following keys to change the value.
key ....... Increases the temperature by one degree. (0-99°C)
MODE key............. Decreases the temperature by one degree. (0-99°C)
PRINT key............. Saves the change, displays end and returns to the specific gravity measuring mode.
RE-ZEROCAL

key ................ Ruturns to the specific gravity measuring mode without saving the change.

The relation between the water temperature and density.
°C
+0
+1
+2
+3
+4
+5
0
0.99984 0.99990 0.99994 0.99996 0.99997 0.99996
10 0.99970 0.99961 0.99949 0.99938 0.99924 0.99910
20 0.99820 0.99799 0.99777 0.99754 0.99730 0.99704
30 0.99565 0.99534 0.99503 0.99470 0.99437 0.99403
40 0.99222 0.99183 0.99144 0.99104 0.99063 0.99021
50 0.98804 0.98758 0.98712 0.98665 0.98618 0.98570
60 0.98320 0.98268 0.98216 0.98163 0.98110 0.98055
70 0.97777 0.97720 0.97662 0.97603 0.97544 0.97485
80 0.97180 0.97117 0.97054 0.96991 0.96927 0.96862
90 0.96532 0.96465 0.96397 0.96328 0.96259 0.96190+60.99994
0.99894
0.99678
0.99368
0.98979
0.985210.98001
0.974250.96797
0.96120(5) Entering the density directly（ldin 1）
In the specific gravity measuring mode, press and hold the

MODE

+7
0.999900.99877
0.99651
0.99333
0.989360.98471
0.97946
0.973640.967310.96050+80.99985
0.99860
0.99623
0.99297
0.988930.984220.978900.97303
0.966650.95979+90.99978
0.998410.99594
0.99259
0.98849
0.98371
0.97834
0.972420.96600
0.95906

key until thedensity currently set (unit: g/cm3, factory setting: 1.0000g/cm3) is displayed. Use
the following keys to change the value.
(+) key .. Changes the numerical value of the digit selected.
RE-ZERO (-) key ... Changes the numerical value of the digit selected.
RANGE key ........... Selects the digit to change the value.
RE-ZERO

PRINT

key............. Saves the change, displays

end

and returns to the specific gravity measuring

mode.

CAL

key ................ Returns to the specifics gravity measuring mode without saving the change.

Note

The range to set the density is 0.0000–1.9999 g/cm3. (Displayed up to four decimal places)43(6) Measuring the density

In the density measurement, the balance displays the weight of the sample in air, the weight in liquid
and then the density.
Measuring the weight of the sample in air.

The processing indicator flashes with the unit “g” displayed.
Measuring the weight of the sample in liquid.

The processing indicator illuminates with the unit “g” displayed.
Displaying the density.

The processing indicator illuminates with no unit displayed.
To siwtch between the above three, use the RANGE key.

44

(7) Measuring procedure
Step 1 Confirm that the balance is in the mode to measure theweight of the sample in air. (“g” displayed and processing
indicator “” flashing)

Step 2 Confirm that the balance indicates zero. If it does notindicate zero, press the RE-ZERO key to reset thedisplayed value to zero.
Step 3 Place the sample on the upper pan (in air). When thevalue displayed on the balance becomes stable, press
the RANGE key to confirm the value (the weight ofsamaple in air). The balance enters the mode to measure
the weight of sample in liquid (“g” displayed andprocessing indicator “Note:

Measuring the weight in air:” ” flashing.

“ illuminating).

If a negative value or E (error) is displayed, the RANGE
key is disabled.

Step 4 Place the sample on the lower pan (in liquid). When thevalue displayed on the balance becomes stable, press
the RANGE kye to confirm the value (the weight ofPress

sample in liquid). The balance enters the mode to display
the density (“g” not illuminated).
Note:

If E (error) is displayed, the RANGE key is disabled.

Measuring the weight in air:” ” illuminated.

Step 5 To output or save the density, press the PRINT key. The
unit for outputting the density is “DS”. To measure thedensity of another sample, press the RANGE key toreturn to the mode to measure the weight in air andPress

repeat the procedure described above.
Note:

If the liquid temperature or the type of liquid is changed
during measurement, reset th evalue of the liquid

Displaying the density:
No “g” displayed.

density as necessary. For details, see “(2) Setting thedensity of a liquid”.

Press

45

14. Input and Output Interface
14.1.RS-232C Interface
Transmission system:

EIA RS-232C

Transmission form:

Asynchronous, bi-directional, half duplex

Data format:

Baud rate: 600, 1200, 2400, 4800, 9600 bps
Data: 7 or 8 bits
Parity: Even, Odd (7 bits), None (8 bits)
Stop bit: 1 bit
Code: ASCII

Data bits
Start bit
Pin connections
Pin No.
1
2
3
4
5
6
7
8–25

Signal name
FG
RXD
TXD
RTS
CTS
DSR
SG
N.C.

-5V

–

-15V

+5V

–

+15V

Stop bit
Parity bit
Direction
Input
OutputInput
OutputOutput-Circuits

Description
Frame ground
Receive data
Transmit data
Ready to send
Clear to send
Data set ready
Signal ground-

Inside

2.6 mm
RS-232C interface
D-sub 25 pin, female connector

PC side (DTE)
Terminal example

46

Balance side (DCE)14.2.External Contact Input
External contact input terminal

Appearance diagram

Compatible plug:

φ3.5 mm 3-pole stereo plug
MP-013LC or the equivalent

External contact input

Example of external contact input terminal
External contact input circuit

Pin assignments
Pin No.

Description

1

GND

2

RE-ZERO

External contact input

3

PRINT

External contact input

When pin 1 and pin 3 or pin 1 and pin 2 are shorted 100 ms or longer, the switch can operate thebalance in the same way as the balance PRINT key or the RE-ZERO key, respectively.
□ AX-SW137-PRINT or AX-SW137-REZERO (optional foot switches sold separately) can be used.

47

15. Connection to Equipment
15.1. Connection to AD-8127 PrinterWhen connecting an AD-8127 printer to the balance for printing weighing data, configure the printer and thebalance as follows.
Printer
AD-8127
Printing mode settings

Example of use
For printing the weighing data of the balance using the balance's
PRINT key or auto print mode.
For printing weighing data of the balance using the printer's print
key or interval printing mode.
For printing in chart printing mode of the printer.

EXT.KEYMANUAL
AUTO
TIMER
CHART

For printing the statistical calculation results of the balance.
DUMP
For printing the GLP output of the balance.
□ To change the settings of the AD-8127 printer, refer to the AD-8127 instruction manual.
Balance
Balance

Balance

Data output mode

Data format

Example of use
For printing the weighing data of the balance using
the balance's PRINT key or auto print mode.
For printing weighing data of the balance using theprinter's print key or interval printing mode.
For printing in chart printing mode of the printer.
For printing the GLP output of the balance.

,

,

,

,

□ To change the settings of the balance, refer to “9. Function Table”.

15.2. Connection to AD-8121B PrinterWhen connecting an AD-8121B printer to the balance for printing weighing data, configure the printer andthe balance as follows.
Class

Item

dout
Data output

prt
Data output mode
ap-p
Auto-print polarity
ap-b
Auto-print differenced-no
Data number output
pU5e
Data pause
at-fAuto feed

Default

AD-8121B
MODE 1AD-8121B
MODE 2AD-8121B
MODE 300,1, 2

3

0,1, 2*1

No setting
required

*1

0

0

0

0, 1

0

0

0

0, 1

0

0

0

0, 1

0
1

48

bp5
Baud rate
btpr
Length, Parity bit
Crlf
Terminator
type
Data format
Ct5
CTS, RTS control

5if
Serialinterface

* 1

2

2

2

2

0

0

0

0

0

0

0

0

0

0

0

1

0

0

0

0

Set when the data output mode is auto print mode (prt 1 or prt 2).

Note
For print samples, "10. ID Number and GLP Report".
AD-8121B settings
Mode

AD-8121B
DIP switch

Description

MODE 1Prints when data is received
Standard mode, statistical calculation mode

MODE 2Printed by DATA key and built-in timer
Standard mode, interval mode, chart mode

MODE 3

Prints when data is received
Dump printing mode

The DIP switch 3 is for unstable data:ON

To print unstable data.

OFF

Not to print unstable data.

The DIP switch 4 is for data input specification:ON

To input via current loop.

OFF

To input via RS-232C.

49

15.3. Connection to Computer
The GR series balance is of the DCE type (Data Communication Equipment), which can be connected
to a personal computer using the RS-232C interface. Before connection, read the personal computer
manual thoroughly. Use a standard DCE cable for connection (cable type: straightthrough). To connect
to a computer that does not have a serial port, we recommend using an optional USB converter (AXUSB-25P).

Using Windows Communication Tools Software (WinCT)

When Windows is used as an operating system in a personal computer, the WinCT software can beused to transmit the weighing data to the personal computer. The current version of the WinCT can be
downloaded from the A&D website. Confirm the windows version supported by this software when
downloading. Refer to the WinCT instruction manual on the A&D website. The WinCT software has

three communication methods: "RsCom" , "RsKey" and "RsWeight".

”RsCom”

Can transmit commands to control the balance.
Can make a bi-directional communication between the balance and a personal computer using the RS-

232C interface.
Can display or store the data using a text file format. Can also print the data using a printer connectedto the personal computer.
When several ports of a personal computer have balances connected, can communicate with eachbalance simultaneously.
Can share a personal computer with other application software.
Can receive the balance GLP report.

”RsKey”

Can transmit the weighing data output from the balance directly to other application software such as
Microsoft Excel.
Can be used with most application software.
Can receive the balance GLP report.

”RsWeight”

Can retrieve the weight data from the balance and display the data as a graph in real time.
Can calculate and display the maximum, minimum, average, standard deviation and coefficient ofvariation.

Using the WinCT software, the balance can do the following:
Analyzing the weighing data and the statistics input by "RsKey"

The weighing data can be input directly into an Excel worksheet. Then, Excel can analyze the data toobtain total, average, standard deviation, maximum and minimum values, and display them in a graph.
Controlling the balance using commands from a personal computer
By using "RsCom", the personal computer sends commands such as "re-zero" or "send weighing data"
to the balance and controls the balance.
Printing the balance GLP report using your printerThe balance GLP report can be printed using a printer connected to the personal computer.
Receiving weighing data at a certain interval
The weighing data can be received at a certain interval and data characteristic with elapsed time canbe obtained.
50

Using the balance memory function
The data can be stored in the balance’s memory. Of the data stored, the weighing data and calibrationdata

can be transmitted to a personal computer at one time.

Using a personal computer as an external indicator
With the "RsKey" test mode function, a personal computer can be used as an external weight indicator
for the balance. (To do this, set the balance data output mode to stream mode.)5116. Commands
16.1.Command List
Commands to request weighing data
C

Cancel command for the SIR command.

S

Request command for stable weighing data.

SIR

Request command for continuous weighing data.

Q

Query command for weighing data.

SI

Query command for weighing data.

Commands to control the balance
CAL

Calibration command.

MD:nnnCommand to delete data of data number nnn.

ON

Display ON command.

PRT

Same as the PRINT key.

RNG

Same as the RANGE key, Range command.

U

Same as the MODE key, Unit command.

MCL

Command to delete all stored data.

OFF

Display OFF command.

P

Same as the ON:OFF key, Display ON/OFF command.

R

Same as the RE-ZERO key, RE-ZERO command.

TST

Calibration test command.

Commands to request stored data?MA

Output command to transmit all memory data.

?MX

Query command for last data number.

?MQnnnRequest command to transmit data of data number nnn.

nnn: numerical value of three figures52

16.2.Commands to Request Weighing Data
Cancel command for the SIR commandC

The balance will stop sending data in stream mode.
Command
Reply(Output is stopped)

Query command for weighing data

Q

The balance will respond with the weighing data immediately.
Command
Reply
Request command for stable weighing data

S

The balance display will blink when the data is transmitted.
Command
Reply

SIR

Request command for continuous weighing data
The balance sends the data in stream mode.
Command
Reply

CautionWhen the baud rate is set to 2400bps or less, the display update rate is faster than the output rate
and the balance may not transmit the data completely (and transmits it intermittently).

53

16.3.Commands to Control the Balance
CAL

Calibration command
Balance performs calibration using the internal weight.
Command
Reply

MCL

Command to delete all stored data.
Command
Reply

MD:nnn(<AK> code is replied)

Command to delete data of data number nnn.
Command
Reply

OFF(Balance is calibrated)(<AK> code is replied)

Display OFF command
If the balance is ON, it will turn OFF. If the balance is already off, nothing will happen.
Command
Reply

ON

Display ON command If the balance is OFF, it will turn ON.
Command
Reply

P(Balance turns off)

(Balance turns on)

Same as the ON:OFF key, Display ON/OFF command.
The balance turns on (or turns off). The command works as the ON:OFF key.
Command
Reply

PRT

Same as the PRINT key, Print command. The command works as the PRINT key.
Command
Reply

R(Balance turns on or off alternately)(Data is output once)

Same as the RE-ZERO key, RE-ZERO command.
The balance will display zero. The command works as the RE-ZERO key.
Command
Reply

RNG(Zero is displayed)Same as the RANGE key, Range command.
The range can be changed. The command works as the RANGE key.
Command
Reply(Sample weight is stored in the balance)

54

Calibration test command

TST

The balance performs the calibration test using the internal weight.
Command
Reply(Calibration test is performed)

Same as the MODE key, Unit command.

U

The unit can be changed. The command works as the MODE key.
Command
Reply(Unit is changed)

16.4.Commands to Request Memory Data?MA

Output command to transmit all memory data.
Command
Reply?MQnnnRequest command to transmit data of data number nnn.
Command
Reply?MX(when the data number is used)(when the data number is not used)

Query command for last data number.
CommandReply

55

16.5.Acknowledge Code and Error Codes
This is an explanation of erCd of the function list
<AK> (06h) ----Acknowledge in ASCII code.

In the Case of erCd 0
The balance does not output <AK> code or the error code.

In the Case of erCd 1
When the balance received a command requesting data and cannot process it, the balance transmits
an error code (EC, Exx). When the balance is able to process a command requesting data, the balance
outputs the data.
When the balance receives a command to control the balance and can not process it, the balancetransmits an error code (EC, Exx). When the balance receives a command to control the balance andcan process it, the balance transmits <AK> (06h) code.
There are some commands that transmit plural <AK> (06h) code from the balance. See "Command
Examples"CAL command (Calibration command)

ON command (ON command)

P command (ON:OFF command)

R command (RE-ZERO command)

TST command (Calibration test)

When a communication error has occurred due to external noise, or a parity error has occurred due totransmission error, the balance transmits an error code. In this case, send the command once more.

16.6.Control using CTS and RTS
This is an explanation of Ct5 of the function list.

In the Case of Ct5 0
Regardless of whether the balance can receive a command or not, the balance keeps the CTS line to
HI. The balance outputs data regardless of the condition of the RTS line.

In the Case of Ct5 1
The CTS line is kept HI normally. When the balance can not receive the next command (ex. processing
last command), the balance sets CTS line to LO.The balance confirms the level of the RTS line whendata can be output. If the RTS level is HI, the balance outputs data. If the RTS level is LO, data is not
output (It cancels data output).

16.7.Related Settings
The balance has internal settings related to RS-232C output, "data output ( dout )" and "serial interface( 5if )." Set according to usage.

56

16.8.Command Examples
This example is set to “ erCd 1 “of “ 5if“ so as to output the <AK> code.

ON command (to turn on the display)
Computer

Time

BalanceStandby display

ON command

Confirmation ofcommand receipt
All segments

All segments

Command completion
Zero display

R command (to zero the display)
Computer

Time

Balance
Weighing mode

R command

Confirmation ofcommand receipt
Processing command

Command completion
Zero display

57

CAL command (to calibrate the balance)
Computer

Time

Balance
Weighing mode

CAL command

Confirmation ofcommand receipt
Message of “start”
Ready
Measurement ofzero point
Ready
Measurement ofinternal mass
Message of “end”
Process of zero display

Command completion
Weighing mode

58

Error code and command cancellation

Example: When the R command is received, but the balance cannot process it and an error code is
output. This example is set to “ erCd 1 “of “ 5if“ .

Computer

Time

Balance
Weighing mode

R command

Confirmation ofcommand receipt
Processing command
Assure that the balancecannot stabilize due tovibration.
The balance sends an error
code and displays it.

If a CAL command isreceived, the R commandis canceled.

CAL command

Weighing mode59

17. Maintenance17.1.Treatment of the Balance
Do not disassemble the balance. Contact your local A&D dealer if your balance needs service or repair.
Please use the original shipping box for transportation.
Do not use organic solvents to clean the balance. Use a warm lint free cloth that is damp, along with adetergent for cleaning.
The "Floor Plate of the Weighing Chamber" can be removed and cleaned.
Consider section "2. Caution“.

17.2.Error codes
Display

Error code
EC,E00EC,E01

EC,E02

EC,E03EC,E04EC,E06EC,E07

EC,E11

EC,E16EC,E17

Description of the error
Communications error
A protocol error occurred in communications.
Confirm the format, baud rate and parity.
Undefined command error
An undefined command was received.
Confirm command.
Not readyA received command cannot be processed.
Adjust the delay time to transmit the command.
ex. The balance received a Q command, but not in theweighing mode.
ex. The balance received a Q command while processing a
RE-ZERO command.
Time over error
If t-Up 1 of the function list is set, the balance did not receive thenext character of a command within the time limit of one second.
Confirm communication.
Excess characters error
The balance received excessive characters in a command.
Confirm command.
Format error
A command includes incorrect data.
Confirm command.
ex. Data is numerically incorrect.
Range error for a parameter
The received data exceeds the range that the balance can accept.
Confirm parameter range of command
Stability error
The balance cannot stabilize due to an environmental problem.
Press the CAL key to return to the weighing mode.
Prevent vibration, drafts, temperature changes, static electricity andmagnetic fields.
Read "2.1. Precautions for Installing the Balance" and "2.2. Cautions
during use (To get best performance)" and be well informed on how
to use the balance.
Internal weight error
This is a calibration error.
Confirm that there is nothing on the pan and retry the calibration orcalibration test.
Internal weight error
This is a calibration error.
Retry the calibration or calibration test.
60

Display

Error code
EC,E20EC,E21

Description of the error
Calibration error
The calibration weight is too heavy. Press the CAL key to return to
the weighing mode.
Calibration error
The calibration weight is too light. Press the CAL key to return to
the weighing mode.
Over load
This is a warning that a weight beyond the balance capacity has
been placed on the pan.
Remove the weight from the pan.
Weighing pan Error
This is a warning that the weight value is too light.
Confirm that the weighing pan and the pan support are properly
installed.
Unit weight, 100% weight error
The unit weight of the sample is very light in the counting mode, or
the 100% sample is too light in percent mode. The balance can notcalculate it. Increase the unit weight or 100% weight.
Unit weight information
This is advice regarding the sample number that is needed to set
the unit weight. When the unit weight is computed and the sample
number is too few, the required number is displayed for counting
accuracy.
Count and place the samples on the pan. Press the PRINT key
to store the correct value.
ARA Zero error
The ARA (Automatic Response Adjustment) cannot be performed,
because there is something on the pan.
Remove all matter from the pan. Press the CAL key to return to theweighing mode.
ARA Unstable error
The ARA (Automatic Response Adjustment) cannot be performed
because of unstable weighing value.
Correct the environment for the balance. Press the CAL key toreturn to the weighing mode.
Low battery (low voltage) error
The voltage supplied to the balance is low.
Check if the correct AC adapter is used.

(blinking)Full memory
The memory data has reached 200 items.
When data is deleted, new data can be stored.
Memory data error
The memory data is lost.
Clear all memory data.

17.3.Other Display
When this indicator () blinks, automatic self calibration is required. The indicator

blinks when the balance detects changes in ambient temperature. If the balance is not
used for several minutes with this indicator blinking, the balance performs automatic
self calibration. The blinking period depends on the operating environment.
AdviseThe balance can be used while this indicator is blinking. We recommend that you
perform automatic self calibration for precision weighing.
6118. Specifications
GR-120GR-200GR-300Weighing capacity

120 g

210 g

310 g

GR-202210 g/42 g

Readability
Repeatability(Standard deviation)
Linearity

0.1 mg

0.1 mg

0.1 mg

0.1 mg/0.01 mg

0.1 mg

0.1 mg

0.2 mg

0.1 mg/0.02 mg±0.2 mg±0.2 mg±0.3 mg±0.2 mg/0.03 mg

Stabilization time (approx.)

3.5 sec

3.5 sec

3.5 sec

3.5 sec/8 sec

Sensitivity drift (10°C – 30°C)
Ambient temperature±2 ppm/°C (when automatic self calibration is not used)
5°C – 40°C (41°F – 104°F), 85%RH or less (no condensation)

Min. unit weight

0.1 mgMin. 100% weight0.01 gInterface

RS-232C

Calibration weight
External calibration weight

Built-in weight
100 g

200 g

200 g

200 g

50 g

100 g

300 g

100 g

Weighing pan

φ85 mmWeighing chamber

178(W) x 160(D) x 233(H) mm

External dimensions

249(W) x 330(D) x 327(H) mm

Power consumption

Approx. 30VA (supplied to AC adapter)

Current consumption

DC12V, approx 0.3A (excluding the AC adapter and options)

AC adapter, Power supply

Please confirm that the AC adapter is correct for your receptacle type andvoltage [factory preset].

Net weight

Approx. 6.0 kg

62

18.1.External Dimensions(Inside: 178)

Height above theweighing pan: 219.5

Opening: 101)

Unit: mm63

18.2.Optional Accessories
List of accessories (sold separately)
AD-8127: Multi printerSmall dot impact printer that connects to the balance via the RS-232C interface.
Statistical calculation mode, calendar/clock function, interval printing mode, chart printing mode,
dump printing mode.

AD-1687: Weighing environment logger
A data logger equipped with 4 sensors for temperature, humidity, barometric pressure and vibrationthat can measure and store environmental data. When connected to the RS-232C interface of thebalance, the AD-1687 can store environmental data along with weighing data. Therefore, it ispossible to store data in an environment where a computer cannot be used. Special software is not
required to read the data.

AD-1688: Data logger

When connected to the RS-232C interface of the balance, the AD-1688 can store the data in anenvironment where a personal computer cannot be used.

AD-8526: Ethernet converter

This converter can be used to connect the RS-232C interface of the balance to the Ethernet (LAN)port of a computer. This allows management of the balance weighing data with a computerconnected to a network.
WinCT can be downloaded from our website https://www.aandd.jp.

AD-8527: Quick USB adapter

Transmits the weighing data directly to software applications such as Excel and Word. IP65
compliant.

AD-8920A: Remote display
A remote display for displaying the weighing data transmitted by the balance using either RS-232C
or current loop.

AD-8922A: Remote controller
Connected to the RS-232C interface, display ON/OFF, calibration, data output, readability switching,unit switching, rezero, etc. can be operated remotely from the balance.

AX-USB-25P: USB converter

Can use serial communication software such as WinCT on a personal computer without COM ports.
Enables bi-directional communication between the personal computer and the balance when a USB
driver is installed.

AD-1671: Anti-vibration table
With a weight of approx. 27 kg and shock-absorbing rubber, it reduces vibrations from the floor andis effective for stable weighing display on the balance.

AD-1672: Tabletop breeze breakProtects the balance from wind from sources such as air conditioning or people passing by, thereby
reducing balance weighing errors. The transparent panel assembly consists of antistatic plastic
material that protects the balance from static electricity.

64AD-1683A: Ionizer (Static eliminator)
Prevents error which can be caused when weighing samples are electrically charged.
Its direct-current system and plentiful ion content enable weighing without breeze, which is ideallysuited for precisely measuring powder and such.
The built-in IR Sensor enables removal of static electricity in a touchless way.

AD-1684A: Electrostatic field meter

Measures the amount of the static charge on the sample, tare or peripheral equipment and displays
the result. If those are found to be charged, discharge them using an ionizer such as AD-1683A.

AD-1682: Rechargeable battery

Allows use of the balance in a place where AC power is not available.

AD-1689: Tweezers for calibration weight

A pair of tweezers ideally suited for holding calibration weights of 1 g to 500 g.
Total length 210mm. With tweezer tip caps.

AX-SW137-PRINT： Foot switch print function with a plug
The foot switch has the same function as the PRINT key.

AX-SW137-REZERO： Foot switch rezero function with a plug
The foot switch has the same function as the RE-ZERO key.

65

A&D Company, Limited

3-23-14 Higashi-Ikebukuro, Toshima-ku, Tokyo 170-0013, JAPAN
Telephone: [81] (3) 5391-6132
Fax: [81] (3) 5391-1566

A&D ENGINEERING, INC.

47747 Warm Springs Blvd, Fremont, California 94539, U.S.A.
Tel: [1] (800) 726-3364
Weighing Support:[1] (888) 726-5931

A&D INSTRUMENTS LIMITED

Inspection Support:[1] (855) 332-8815

Unit 24/26 Blacklands Way, Abingdon Business Park, Abingdon, Oxfordshire
Telephone: [44] (1235) 550420
Fax: [44] (1235) 550485

OX14 1DY

United Kingdom

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32 Dew Street, Thebarton, South Australia 5031, AUSTRALIA
Telephone: [61] (8) 8301-8100
Fax: [61] (8) 8352-7409

A&D KOREA Limited

한국에이.엔.디(주)OOO A&D RUS

OOO "ЭЙ энд ДИ РУС"서울특별시 영등포구 국제금융로6길33 (여의도동) 맨하탄빌딩 817 우편 번호 07331( 817, Manhattan Bldg., 33. Gukjegeumyung-ro 6-gil, Yeongdeungpo-gu, Seoul, 07331 Korea )전화: [82] (2) 780-4101
팩스: [82] (2) 782-4264

Почтовый адрес:121357, Российская Федерация, г.Москва, ул. Верейская, дом 17Юридический адрес: 117545, Российская Федерация, г. Москва, ул. Дорожная, д.3, корп.6, комн. 8б
( 121357, Russian Federation, Moscow, Vereyskaya Street 17 )тел.: [7] (495) 937-33-44
факс: [7] (495) 937-55-66

A&D Instruments India Private Limited( 509, Udyog Vihar, Phase- , Gurgaon - 122016, Haryana, India ): [91] (124) 4715555: [91] (124) 4715599

A&D SCIENTECH TAIWAN LIMITED.

A&D台灣分公司 艾安得股份有限公司

台湾台北市中正區青島東路 5 號 4 樓
( 4F No.5 Ching Tao East Road, Taipei Taiwan R.O.C. )Tel : [886](02) 2322-4722
Fax : [886](02) 2392-1794

A&D INSTRUMENTS (THAILAND) LIMITEDบริษัท เอ แอนด์ ดี อินสทรูเม้นท์ (ไทยแลนด์) จำกัด
168/16 หมู่ที่ 1 ตำบลรังสิต อำเภอธัญบุรี จังหวัดปทุมธานี 12110 ประเทศไทย
( 168/16 Moo 1, Rangsit, Thanyaburi, Pathumthani 12110 Thailand )Tel : [66] 20038911