TD-240A
OPERATION MANUALTEAC INSTRUMENTS CORPORATION
Rev.1.35
2005.JULIntroduction

Introduction
We appreciate your kind purchase of TD-240A Digital Indicator.
To take full advantage of high performance of TD-240A, Thoroughly read this operating
manual first before use and understand the explanations contained herein for correct
operating procedures.

Safety Precautions

Safety Precautions

Be sure to read for safety.

In order to have an TD-240A Digital Indicator used safely, notes I would like you to surely
follow divide into

WARNING and

CAUTION , and are indicated by the following

documents.Notes indicated here are the serious contents related safely.Please use after
understanding the contents well.

WARNING
Misuse may cause the risk of death or serious
injury to persons.

CAUTION
Misuse may cause the risk of injury to persons
or damage to property.

Safety Precautions

WARNING● Use TD-240A with correct supply voltage.

● Do not carry out the direct file of the commercial power supply to a signal input terminal.

● Carefully check wiring, etc. before applying power.

● Set the correct Excitation Voltage for the sensor. （10V is set when TD-240A is
dispatched from us.）

● Do not disassemble the main body for modifications or repair.

● Be sure to ground the protective ground terminal.

● When smoke, a nasty smell, or strange sound, please shut off a power supply
immediately and extract a power supply cable.

● Do not install in the following environments.
- Placeｓ containing corrosive gas or flammable gas.
- Where the product may be splashed with water, oil or chemicals.

Safety Precautions

CAUTION● Be sure to disconnect the power cable when performing the following.
- Attachment/detachment of connectors of options.
- Wiring/connection of cables to terminal blocks.
- Connection of the ground line.

● Take an interval of more than 5 seconds when repeating ON/OFF.

● For connection to the signal I/O terminal block, wire correctly after checking the signal
names and terminal block numbers.
Also, turn off the power of the main body before connection/wiring to the signal I/Oterminal block.

● Use shielded cables for the connection of strain gauge type sensor, displacement
sensor, External input and output or options.

● Take adequate shielding measures when using at the following locations.
- Near a power line.
- Where a strong electric field or magnetic field is formed.
- Where static electricity, relay noise or the like is generated.

● Do not install in the following environments.
- Where the temperature and/or humidity exceeds the range in the specifications.
- Placeｓ with large quantities of salt or iron powder.
- Where the main body is directly affected by vibration or shock.

● Do not use it, broken down.

● When you send TD-240A by repair etc., please take sufficient measures against a
shock.

CONTENTS

CONTENTS
1．FUNCTIONAL DESCRIPTIONS ............................................. 1
1-1．Front Panel ............................................................................................ 1
1-1-1．Status Display .................................................................................. 1
1-1-2．Numerical Display ........................................................................... 2
1-1-3．Setting Key Pad ............................................................................... 2

1-2．Rear Panel ............................................................................................. 4
1-2-1．Guard Ground................................................................................... 4
1-2-2．Frame Ground (Functional ground) ............................................... 4
1-2-3．Options Slot ..................................................................................... 4
1-2-4．AC Power Input Terminal Board .................................................... 4
1-2-5．Signal Input/Output Terminal Board .............................................. 5

2．CONNECTION ........................................................................7
2-1．Connecting to Cage Clamp Terminal Block ....................................... 7
2-2．Connecting Strain Gauge Sensor ....................................................... 8
2-3．Connecting Power Input Terminal ...................................................... 92-4．Connecting SI/F .................................................................................. 10
2-5．Connecting High / Low Limit Relays ................................................. 11
2-6．Connecting Hold and Digital Zero Signals ........................................ 12
2-7．Connecting Voltage Output (VOL OUT) ............................................ 13

3．SETTING MODE CONFIGURATION ....................................143-1．Selection of Setting Items .................................................................. 14
3-2．Display of Setting Items ..................................................................... 16
3-3．List of Values ...................................................................................... 17
3-4．Setting Procedure ............................................................................... 19

CONTENTS

4．CALIBRATION ......................................................................20
4-1．Equivalent Input Calibration Procedure ........................................... 21
4-2．Actual Load Calibration ..................................................................... 26

5．SETTING OF FUNCTIONS ...................................................31
5-1．High /Low Limit Value ........................................................................ 31
5-2．High / Low Limit Comparator Mode .................................................. 33
5-3．Hysteresis ............................................................................................ 34
5-4．Digital Offset ....................................................................................... 37
5-5．Near Zero ............................................................................................. 38
5-6．Digital Filter ......................................................................................... 39
5-7．Analog Filter ........................................................................................ 40
5-8．Motion Detect ...................................................................................... 41
5-9．Zero Tracking ...................................................................................... 43
5-10．Hold Mode ......................................................................................... 45
5-11．Automatic Printing ............................................................................ 46
5-12．Hold Value Printing ........................................................................... 48
5-13．LOCK .................................................................................................. 49
5-14．Scale Division ................................................................................... 50
5-15．Display Frequency ............................................................................ 51
5-16．Excitation Voltage ............................................................................. 52

6．HOLD FUNCTION ..................................................................53
6-1．Peak Hold ............................................................................................ 53
6-2．Sample Hold Operation (Digital Hold) ............................................... 56

7．DIGITAL ZERO FUNCTION ..................................................58

CONTENTS

8．BCD DATA OUTPUT（TD-2403）.........................................59
8-1．Connector Pin Assignment ................................................................ 59
8-2．Logic Switching .................................................................................. 60
8-3．Equivalent Circuit ............................................................................... 60
8-4．Signal Timing ...................................................................................... 61
8-5．BCD Data Update Rate Selection ...................................................... 62

9．RS-232C INTERFACE（TD-2404）.......................................64
9-1．Communication Specifications ......................................................... 64
9-1-1．Standard ......................................................................................... 64
9-1-2．Connector Pin Assignment .......................................................... 65
9-1-3．About Cables ................................................................................. 65

9-2．Setting RS-232C Interface ................................................................. 66
9-3．Communication Mode ........................................................................ 67
9-4．Communication Format ..................................................................... 67

10．D/A CONVERTER（TD-2407） ...........................................72
10-1．Obtaining Voltage Output Signal .................................................... 73
10-2．Obtaining Current Output Signal .................................................... 73
10-3．About Resolution .............................................................................. 74
10-4．Setting D/A Zero Full Scale .............................................................. 75
10-5．About D/A Output Error .................................................................... 76

11．DC POWER SOURCE ........................................................77

12．OVERSCALE/ERROR DISPLAYS .....................................78
12-1．Overscale Display ............................................................................. 78
12-2．Calibration Error Display ................................................................. 78

CONTENTS

13．SELF-CHECK FUNCTION AND INITIALIZATION .............79
13-1．Self-Check ......................................................................................... 79
13-2．Initialization ....................................................................................... 81
13-3．TD-240A Block Diagram ................................................................... 83

14．DIMENSIONS ......................................................................84

15．SPECIFICATIONS ..............................................................85
15-1．Analog Section .................................................................................. 85
15-2．Indicator Section ............................................................................... 86
15-3．Setting Section .................................................................................. 86
15-4．External Signals ................................................................................ 86
15-5．Interface.............................................................................................. 86
15-6．Option ................................................................................................ 87
15-7．General Specifications ..................................................................... 87
15-8．Accessories ....................................................................................... 88

16．CONFORMITY TO EC DIRECTIVES ..................................89

1.FUNCTIONAL DESCRIPTIONS

1. FUNCTIONAL DESCRIPTIONS
1-1. Front Panel
STATUSDISPLAY

NUMERICALDISPLAYSETTINGKEY PAD

1-1-1. Status Display
The TD-240A status is indicated. Setting items are indicated when setting.

HI：

This LED turns on when the indicated value is larger than the set value of thehigh limit（indicated value ＞ high limit）
Operation of the high limit relay is on.

OK：

This LED turns on when the indicated value is smaller than the set value ofthe high limit and larger than the set value of the low limit（low limit ≦ indicated value ≦ high limit）

LOW： This LED turns on when the indicated value is smaller than the set value ofthe low limit（indicated value ＜ low limit）
Operation of the low limit relay is on.

PEAK： This LED is blinking when the Peak Hold function is activated.

HOLD： This LED turns on when the indicated value is the held value.

11.FUNCTIONAL DESCRIPTIONS

1-1-2. Numerical Display
The three types of display are provided.
1）Indicated value2）Set value

3）Overflow display• Minus overflow of the A/D converter（－ LOAD）• Plus overflow of the A/D converter（LOAD）• Indicated value overflowed （indicated value ＜－ 19999）（OFL1）• Indicated value overflowed （indicated value ＞ 19999）（OFL2）

1-1-3. Setting Key Pad
These are keys for commanding settings and operations.
Increments by one the numeric in the blinking digit of the settingUP

item selection or set value.

Decrements by one the numeric in the blinking digit of the setting

DOWN

item selection or set value.

Enters the setting mode. Setting mode“F1”is indicated.

FNC

This key sets a decimal point in the span calibration.
Indicated value display
FNC

Setting mode“F1”displayEnters the actual load calibration mode.

SEL

Select the setting mode number and the blinking digit of the setting
value in setting.
SHIFTEnters the equivalent input calibration mode.
CAL

2

Inputs the minus sign in setting.

1.FUNCTIONAL DESCRIPTIONS

ENTValidates setting items and set values.

HOLD

Starts the Hold function. To cancel the Hold function,
press

ZERO

HOLD

key again.

Forcibly resets the indicated value to zero （digital zero function）.
When the calibration LOCK is turned off, the digital zero function is
not activated using this key.External DZ input is also disabled.

ESC

Cancels setting and returns to the indicated value display.
setting in progress

Indicated Value display
ESC

3

1.FUNCTIONAL DESCRIPTIONS

1-2. Rear Panel1234

AC INPUTTERMINAL BOARD

5
6

SIGNALINPUT/OUTPUTTERMINAL BOARD

7
8
9

L
AC IN
N
F.G.

OPTION SLOT

10
11

SER. No.

12
13

FRAME GROUND

14
15

GUARD GROUND

MADE IN JAPAN

1-2-1. GUARD GROUNDThis is a guard ground terminal block. Be sure to ground the guard ground terminal toprevent electric shocks and failures due to static electricity.（The frame and the guard
ground terminal are conducted.）

1-2-2. Frame Ground (Functional ground)This is a F.G terminal of AC input.（The frame and the F.G terminal are conducted.）

1-2-3. Options Slot
One option board can in stall in the option slot.

・TD-2403

BCD Parallel data output

・TD-2404

RS-232C Interface

・TD-2407

D/A Converter

1-2-4. AC Power Input Terminal Board
Connect AC power code. The input voltage is 100V-240V AC.
The frequency is 50/60Hz.

4

1.FUNCTIONAL DESCRIPTIONS

1-2-5. Signal Input/Output Terminal Board
This terminal board is used for input/output of control signals, SI/F data output, andinput of strain gauge sensor signals.

・Terminal board Assignment

1

SI/F

2


10

11

SER.N
㧿㧱㧾㧚㧺


12

13

14

15

Connect the shield
cable of the sensor.

3

N/O

4

COM

5

N/O

6

COM

High limit relay

Low limit relay

7

Hold input

8

COM

9

DZ input

10

Analog voltage output

11

Analog COM

12

＋ EXC

13

－ SIG

14

－ EXC

15

＋ SIG

Strain gauge
sensor input

SHIELD

1・2 ： Two-wire serial interface （SI/F）for connecting printers and external display
from TEAC.
This interface has no polarity and can connect up to three external devices.
Use parallel two-core cables or captire cables.

3 ～ 6： Output terminals of the high/low limit relays.
3・・・High limit relay （N/O）
4・・・High limit COM
5・・・Low limit relay （N/O）
6・・・Low limit COM
Rating is 250V AC and 0.5A.

5

1.FUNCTIONAL DESCRIPTIONS

７・８： Terminals for inputting hold signals
7・・・Hold input
8・・・ COM

８・９： Terminals for inputting digital zero signals. Available in LOCK ON only.
9・・・DZ input
8・・・ COM

10・11： Terminal for output of a voltage proportional to the sensor input.
Output voltage is approx. 2V per 1mV/V(sensor input).
10・・・Voltage output （0 to Approx. ± 6V）
11・・・ COM

12 ～ 15：Terminal for connecting a strain gauge sensor
12・・・＋ EXC
13・・・ － SIG
14・・・－ EXC
15・・・ ＋ SIG

6

2.CONNECTION

2. CONNECTION
2-1. Connecting to Cage Clamp Terminal Block
1.Strip the casing 0.2in (6mm) on the cable to be connected.
0.2in

2.Twist the bare wire to fit the terminal hole.

3.Insert the supplied screwdriver into the upper hole and lift upward.

4.Insert the twisted wires into the lower hole.

5.Make sure cable is clamped securely and does not come out with a slight tug.

Request・Cable can be from 24 to 14AWG (0.2 to 2.5mm2)・It is not necessary to solder the cable wires or to fix a solderless terminal.
・If several cables to be inserted to the same hole,twist those cable wires
together and insert.

7

2.CONNECTION

2-2. Connecting Strain Gauge Sensor
・4-wire sensor

12 （＋ EXC）
＋ IN
－ OUT

＋ OUT

13 （－ SIG）

14 （－ EXC）

－ IN

TD-240A

15 （＋ SIG）

（SHIELD）

・6-wire sensor＋ IN

12 （＋ EXC）

－ OUT

＋ OUT

13 （－ SIG）

14（－ EXC）－ IN

15 （＋ SIG）

（SHIELD）

8

TD-240A

2.CONNECTION

2-3. Connecting Power Input Terminal
AC spec.
Before connecting cables to the terminal block, put on
climp-style terminals (M3) to the cables as shown in the
figure so that the cables tips might not straggle.
Black

L
AC IN
N

White
Green

F.G.
6mm or lessConnect AC power code. The input voltage is 100V-240V AC.
The frequency is 50/60Hz.

DC spec. (Depending on the request at the time of order)

Red

＋
DC IN
－
F.G.

6mm or less

Black
緑

Connect the positive (+) side of the power source to the red screw side of the terminal
block on the back of the TD-240A, and its negative (-) side to the black screw side.The
input voltage is 12V-24V DC.

CAUTIONBe aware that the voltage drops depending on the wire thickness and length.
Also, never input an AC power source. Doing so will cause a failure.

92.CONNECTION

2-4. Connecting SI/F
Two-wire serial interface （SI/F）for connecting printers and external display from
TEAC.
This interface has no polarity and can connect up to three external devices.
Use parallel two-core cables or captire cables.

TD-240A

１
SI/F
２

Printer← Inside Outside →10

Display

Converter

2.CONNECTION

2-5. Connecting High / Low Limit Relays
・Connecting External Load
[ High limit relay ]AC Power Supply
TD-240A

Varistor

N/O

Load

３

[ Low limit relay ]Spark Killer
Connect a spark killer asnear the load as possible.

TD-240A

AC

Power Supply

N/O
５

COM
COM

４

６

← Inside Outside →← Inside Outside →DC Power Supply
TD-240A
N/O[ Low limit relay ]３

Spark Killer

Load

Connect a diode asnear the load as possible.

TD-240A

DC

Power Supply

N/O
５

COM
COM

４

６

← Inside Outside →← Inside Outside →CAUTION
Overvoltage and overcurrent may cause breakdown of the relay as well
as shortening its life.
It is recommended to connect a spark killer etc. to the connected load
according to AC/DC (refer to the connection examples). With a noise
killer, you can make the life of the relay longer as well as making it
resistible against noise.
Never short-circuit the load.
Should you do it, the equipment will break down.

11

2.CONNECTION

2-6. Connecting Hold and Digital Zero Signals
・Equivalent circuit （input）[ Hold input ]TD-240A← Inside Outside →Vcc

Toggleelay
switch+12V

RelayContact
Ic=Approx.8mA

Transistor

7
COM

Push
switch8＊IN[ DZ input ]IN

TTL opencollect output

ON when IN is ’H

Connect 9 and 8.
Ic=Approx.8mA
9
COM

Push
switch8

CAUTION・Avoid applying external voltages to the signal
・Use external elements which withstands Ic=10mA・Leakage current from external element must be 30μA or below.

122.CONNECTION

2-7. Connecting Voltage Output (VOL OUT)
Terminal for out put of a voltage proportional to the sensor input .
Output voltage is approx. 2V per 1mV/V(sensor input).

TD-240A← Inside Outside →
10

SIG

＋
External device

11

－
GND

Load resistance2kΩor above13

3.SETTING MODE CONFIGURATION

3. SETTING MODE CONFIGURATION
3-1. Selection of Setting Items
FNC

Setting Mode 1

Setting Mode 2
SEL

DOWN

UP

DOWN

SEL

High Limit
DOWN

UP

UP

Digital Filter（P.31）（P.39）DOWN

UP（P.31）

Analog Filter（P.40）

High/LowLlimit（P.33）
Comparison Mode

Motion Detect（time）（P.41）（P.34）

Motion Detect（band）（P.41）（P.37）

Zero Tracking（time）（P.43）

Zero Tracking（band）（P.43）

Hold Mode（P.45）

Automatic Printing（P.46）

Low Limit

Hysteresis

Digital
OffsetNear Zero（P.38）

Hold Value Printing

14（P.48）

3.SETTING MODE CONFIGURATION

Setting Mode3

Setting Mode4
SEL

DOWN

UP

DOWN

LOCK
DOWN

UP

UP

BCD Data
Update Rate

（P.49）DOWN

Scale
Division

DisplayFrequency

Excitation
Voltage（P.62）
UP（P.50）
RS-232C（P.66）

D/A Zero Setting（P.75）

D/A Full Scale
Setting（P.75）（P.51）（P.52）

15

3.SETTING MODE CONFIGURATION

3-2. Display of Setting Items

Blnking・Mode1(1) High Limit(2) Low Limit(3) High/Low Limit Comparison

OFF

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

Mode

(4) Hysteresis(5) Digital Offset(6) Near Zero・Mode2(1) Digital Filter(2) Analog Filter(3) Motion Detect（time）(4) Motion Detect（band）(5) Zero Tracking （time）(6) Zero Tracking（band）(7) Hold Mode

(8) Automatic Printing(9) Hold value Printing

16

3.SETTING MODE CONFIGURATION

・Mode3(1) LOCK(2) Scale Division(3) Display Frequency(4) Excitation Voltage

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

HI

OK

LOW

PEAK

HOLD

・Mode4(1) BCD Data Update Rate(2) RS-232C(3) D/A Zero Setting(4) D/A Full Scale Setting

3-3. List of Values
Setting Mode1
Item

Default

Set Value
LOCK

1High Limit

075.00○2

Low Limit

025.00○3

High/Low Limit Comparison Mode

0

○

4

Hysteresis

00.00

○

5

Digital Offset

000.00○

6

Near Zero

001.00○Calibration
LOCK

17

3.SETTING MODE CONFIGURATION
Setting Mode2
Item

Default

Set Value
LOCK

1Digital Filter

0

○

2

Analog Filter

2

○

3

Motion Detect（time）

1.5

○

4

Motion Detect（band）

05

○

5

Zero Tracking（time）

0.0

○

6

Zero Tracking（band）

00

○

7

Hold Mode0○8

Automatic Printing

1

○

9

Hold Value Printing0○

Default

Set Value
LOCK

Calibration
LOCK

Setting Mode3
Item

Calibration
LOCK

1

LOCK

0000

2

Scale Division

0.01

○

3

Display Frequency

3

○

4

Excitation Voltage

1○

Setting Mode4
Item

Set Value
LOCK

0

○

1

BCD Data Update Rate2

RS-232C

13010

○

3

D/A Zero Setting

000.00○4

D/A Full Scale Setting

100.00○※ default：factory-set value

18

Default

Calibration
LOCK

3.SETTING MODE CONFIGURATION

3-4. Setting Procedure
FNC“F1”of setting Mode1
is displayed.

SEL

SEL

SEL

“F2”of setting Mode2
is displayed.

“F3”of setting Mode3
is displayed.

“F4”of setting Mode4
is displayed.

UP

DOWN

UP

Select asetting item..

UP

DOWN

Select asetting item..

ENT

SEL

UP

SEL

UP

DOWN

Select asetting item..

DOWN

Select asetting item..

The most significant digit starts blinking
to prompt setting.

Select a digit where setting is desired.

DOWN

Set a value.
If wishing to affix a sign to the high/low limit
and digital offset, D/A zero setting full scale
SHIFT
setting, press
key.
CAL

ENT

ESC

If one minute has elapsed after
beforeENT

FNC

Set Value is validated.

Setting Mode is terminated to return tothe indicated value display.

key is pressed without any key hit

key is pressed,the setting is canceled and the indicated value is displayed

again. The set value is not stored in this case.

19

4.CALIBRATION

4. CALIBRATION"Calibration" refers to an operation whereby matching between the TD-240A and astrain gauge sensor is obtained. The TD-240A uses the two calibration methods as
described below.

◇ Equivalent Input Calibration
This approach uses no actual loads but key entry of the rated output value of the strain
gauge sensor (mV/V) and the rating value (value to be displayed).
This method is simple and employed when actual loads cannot be applied.
For example
Gain will be automatically decided by registering the values indicated as follows:
for load: 2.001mV/V - 100.0kgf
for pressure: 2.002mV/V - 10.00kgf/cm2, andfor torque: 2.502mV/V - 15.00kgf•m.
TD-240A

Strain gauge sensor
Rated output value（mV/V）＋

Indicated value

A data sheet will be attached to a strain gauge sensor you buy.
On the data seat, the following values are listed.
Capacity ................................... Load (unit: Kg, t, etc.)
Rated Output............................ Voltage (unit: mV/V)
Non-Linearity，

Hysterisis，Input Resistance，Output Resistance，
Zero Balance, etc.
The Capacity and the Rated Output are necessary values for theequivalent input calibration. Input these two values to TD-240A.

20

4.CALIBRATION◇ Actual Load Calibration
This approach provides calibration by applying an actual load to the strain gauge sensor
and inputting the actual load value. This calibration is without little errors and morecorrect.

TD-240A

Actualload

Strain gauge sensor
Indicated value

4-1. Equivalent Input Calibration Procedure
The equivalent input calibration uses the following procedure :Releasing Calibration LOCK

Setting Scale Division

Release the Calibration LOCK that inhibits calibration.

Set the minimum value of the digital change desired（omissible if no desired value is present）

Equivalent Input Calibration

Set the rated output vale and zero point of the strain
gauge sensor.

Inhibit Calibration
Calibration LockSet the calibration of ON to prevent misoperation.

21

4.CALIBRATION

・Releasing Calibration LOCK

Releasing Calibration LOCK
1)Select setting mode 3.
SEL

FNC

SEL

2)Select calibration lock.
DOWN

ENT

SEL

Calibration LOCK
1：ON
0：OFF

Use

UP

and

OFF（0）．then use

DOWN

ENT

key to set the calibration lock of
key to validate the setting.

To return to the indicated value display, press

22

ESC

key.

4.CALIBRATION

・Setting of Scale Division （Omissible if no change is needed）

Setting of Scale Division
1) Select setting mode 3.
SEL

FNC

SEL

2) Set the scale division.
DOWN

Press twice.

ENT

Scale Division（001 to 100）Usethen use

DOWN

UP

ENT

and

SEL

keys to set the scale division,

key to validate the setting.

To return to the indicated value display, press

ESC

key.

23

4.CALIBRATION

・Equivalent Input Calibration

Equivalent Input Calibration
1) Start the equivalent input calibration.

Example of a sensor having the output
value of 2.010mV/V for rated 100.00kgf（N）

ENT

SHIFT
CAL

Rated Output Value（0.500 to 3.000mV/V）
2) Set the rated output value of the sensor.
Use

DOWN

UP

and

SEL

keys

to set the rated output value,
ENT

then use

key to validata the setting.
Rated Value（00000 to 19999）

3) Set the rated value.

Usethen use

DOWN

UP

ENT

and

SEL

keys to set the rated value,

key to validate the setting. Press

FNC

key at a blinking

digit to place a decimal point immediately after the digit.

4) Place the sensor without load and set the zero point. Check that the sensor is
unloaded,then press

ZERO

and

ENT

keys in this order.

If the indicated value following the display CAL2E iszero, the equivalent input calibration is terminated.

If a calibration error display appears, take a proper action according to the error,
then perform calibration again.
c…Span set value is "00000". Set a correct span value.

On completion of calibration, turn on the calibration LOCK.

24

4.CALIBRATION

・Calibration LOCK

CalibrationLOCK
1) Select setting mode 3.
SEL

FNC

SEL

2) Select calibration lock.
DOWN

ENT

SEL

Calibration LOCK
1：ON
0：OFF

3) UseUP

andON（1）．then use

DOWN

ENT

key to set the calibration lock of
key to validate the setting.

To return to the indicated value display, press

ESC

key.

25

4.CALIBRATION

4-2. Actual Load Calibration
The actual load calibration uses the following procedure

Releasing Calibration LOCK

Setting of Scale Division26

Release the calibration LOCK that inhibits calibration.

Set the minimum value of the digital change desired.
（omissible if no desired value is present）.

Zero Calibration

Set the zero point of the strain gauge sensor.

Actual Load Calibration

Set the span(gain) point of the strain gage sensor.

Calibration LOCK

Set the calibration of ON to prevent misoperation.

4.CALIBRATION

・Releasing Calibration LOCK
Releasing Calibration LOCK
1) Select setting mode 3.
SEL

FNC

SEL

2) Select calibration lock.
DOWN

ENT

SEL

Calibration LOCK
1：ON
0：OFF

Use

UP

and

OFF（0）．then use

DOWN

ENT

key to set the calibration lock of
key to validate the setting.

To return to the indicated value display, press

ESC

key.

27

4.CALIBRATION
・Setting of Scale Division（omissible if no change is needed）
Setting of Scale Division
1) Select setting mode 3.
SEL

FNC

SEL

2) Set the scale division.
DOWN

Press twice.

ENT

Scale Division（001to 100）
Use

DOWN

UP

then use

ENT

and

SEL

keys to set the scale division，

key to validate the setting.

To return to the indicated value display, press

ESC

key.

・Zero Calibration

Zero Calibration

1)Check that the sensor is unloaded, then press

ZERO

and

ENT

keys inthis order.

If the indicated value following the display CAL2E iszero, the zero calibration is terminated.

28

4.CALIBRATION

・Actual Load Calibration

Actual Load Calibration
1) Apply an actual load to the sensor and set the actual load value.
ENT

SEL

Indicated Value of（00000 to 19999）
Actual Load Value

Use
then

DOWN

UP

ENT

and

SEL

keys to set the actual load value，

key to validate the setting.

To move the decimal point, press

FNC

key at a blinking digit.

If the indicated value following the display CALSP is
Actual Load, the Actual Load calibration is terminated.

If a calibration error display appears, take a proper action according to the error, thenperform calibration again.

…Span set value is "00000".
Set a correct span value.

…Output of the strain gauge sensor does not reach the span adjustment
range.
Confirm whether an actual load is put on the strain gauge sensor.
Calibration may not be performed without load

…Output of the strain gauge sensor is on the minus side.
Check to see if the +SIG and -SIG wiring if the sensor is reversed.

On completion of calibration, turn on the calibration LOCK.

29

4.CALIBRATION

・Calibration LOCK

Calibration LOCK
1) Select setting mode 3.
SEL

FNC

SEL

2) Select calibration lock.
DOWN

ENT

SEL

Calibration LOCK
1：ON
0：OFF

3）Use

UP

and

ON（1）．then use

DOWN

ENT

key to set the calibration lock of
key to validate the setting

To return to the indicated value display, press

30

ESC

key.

5.SETTING OF FUNCTIONS

5. SETTING OF FUNCTIONS
5-1. High /Low Limit ValueHigh / Low limit value are functions whereby the high output is turned on when theindicated value exceeds the high / low output is turned on when it drops below the low
limit.

＜ HIGH/LOW output conditions ＞
HIGH：Indicated value ＞ High limit value

LOW：Indicated value ＜ Low limit value

Indicated value
High limit value

Low limit value

Time

HIGH OFF
ON

LOW

OFF
ON

31

5.SETTING OF FUNCTIONS

Setting of High/Low Limit Value
1) Select setting mode 1.
FNC

2) Select high limit value.
ENT

DOWN

High Limit Value（00000 to ± 19999）

Use
Press

DOWN

UP

SHIFT
CAL

and

SEL

keys to set the high limit value.
ENT

key to place a minus sign. press

key to validate thesetting.

3) Select low limit value.
DOWN

ENT

Low Limit Value（00000 to ± 19999）

Use
Press
Press

DOWN

UP

SHIFT
CAL

ENT

and

SEL

key to set the low limit value.

key to place a minus sign.
key to validate the setting

To return to the indicated value display, press

32

ESC

key.

5.SETTING OF FUNCTIONS

5-2. High / Low Limit Comparator ModeHigh / Low Limit Comparator Mode
1)Select setting mode 1.
FNC2)Select high / low limit comparator mode.
DOWN

Press three times.

ENT

High / Low Limit
Comparator Mode
3：Comparison is made at stablestatus except for near zero.

2：Comparison is always madeexcept for near zero
1：Comparison is made in thestabl status.
0：Comparison is always made.

Usethen use

UP

and
ENT

DOWN

keys to set the high / low Limit Comparator Mode,key to validate the setting.

To return to the indicated value display, press

ESC

key.

Except for Mode 0 （Comparison is always made）of the High / Low
Limit Comparator Mode, setting is closely related to Near Zero andMotion Detect functions. For details, see Near Zero on page 38 andMotion Detect on page 41 .

33

5.SETTING OF FUNCTIONS

5-3. Hysteresis
The Hysteresis function provides a range of high/low limit comparator off. Usually thehigh limit comparator is turned on when the indicated value is above the high limit value
and turned off when below. If you set a hysteresis range, the comparator is turned off
when the indicated value is below the high limit value by the hysteresis setting. This iseffective in preventing chattering caused when signals are slightly varying （vibrating) .

〈Comparison conditions〉

・High limit
ON conditions ：Indicated value ＞ High limit value
OFF conditions：Indicated value ≦（High limit value － Hysteresis set value）

・Low limit
ON conditions ：Indicated value ＜ Low limit value
OFF conditions：Indicated value ≧（Low limit value ＋ Hysteresis set value）

34

5.SETTING OF FUNCTIONS・Hysteresis operation

Indicated value

High limit
value

Hysteresis range

Low limit
value
＋
0
－

Time

High limit relay
HI LED

Low limit relay
LO LED

OK LED

Relay ON
LED ON

Relay OFFLED OFF

Relay ON
LED ON

Relay OFFLED OFF

Relay OFFLED OFF

Relay ON
LED ON

35

5.SETTING OF FUNCTIONS

Setting of Hysteresis
1) Select setting mode 1.
FNC

2) Select hysteresis.
DOWN

Press four times.

ENT

Hysteresis（0000 to 9999）

DOWN

UP

Use
then use

ENT

and

SEL

keys to set the hysteresis range，

key to validate the setting.

To return to the indicated value display, press

ESC

key.

Hysteresis setting is the same for high / low limit.

36

5.SETTING OF FUNCTIONS

5-4. Digital Offset
This function subtracts a set value from the indicated value. If you make digital offset,
the value which is obtained by subtracting the set value from the indicated value will be
displayed. This is convenient when you cannot obtain zero by unloading the equipment
for some reason or when you want to give offset.
(Indicated value to be displayed) = (Actual indicated value) - (Digital offset setting value)

Setting of Digital Offset
1) Select setting mode 1.
FNC

2) Select digital offset.
DOWN

Press five times.

ENT

Digital Offset (00000 to ± 19999)

Input an digital offset setting value withand validate it with

ENT

DOWN

UP

key. Press

To return to the indicated value display, press

SHIFT
CAL

ESC

and

SEL

keys

key to put minus sign.
key.

37

5.SETTING OF FUNCTIONS

5-5. Near Zero
The Near Zero function detects that the indicated value is near zero.

Near Zero ON/OFF is closely related to Automatic Printing and Highand Low Limit Comparator Mode.
For details, see High and Low Limit Comparator Mode on page 33 andAutomatic Printing on page 46 .

Setting of Near Zero
1) Select setting mode 1.
FNC

2) Select near zero.
DOWN

Press six times.

ENT

Near Zero（00000 to 19999）

DOWN

UP

Use
then use

ENT

and

SEL

keys to set the near zero.

key to validate the setting.

To return to the indicated value display, press

ESC

key.

The Near Zero function operates at an absolute value.

38

5.SETTING OF FUNCTIONS

5-6. Digital Filter
The Digital Filter function obtains the moving average of Analog-to-Digital（A/D）
converted data and stabilizes the indicated values. The moving average count can beselected from 4 to 64.

Setting of Digital Filter
1) Select setting mode 2.
SEL

FNC

2) Select digital filter.
DOWN

ENT

Digital Filter
5：64 times
4：32 times
3：16 times

Usethen use

UP

and
ENT

DOWN

2：8 times
1：4 times
0：OFF

keys to set the digtal filter,

key to validate the setting.

To return to the indicated value display, press

ESC

key.

39

5.SETTING OF FUNCTIONS

5-7. Analog Filter
This is a lowpass filter filtering the strain gage sensors input signal and cutout the noiseelement.
Lowpass filter cutout freguency is selectable in the 4/10/100/3k Hz.

Setting of Analog Filter
1) Select setting mode 2.
SEL

FNC

2) Select analog filter.
DOWN

Press twice.

ENT

Analog Filter
3：3kHz2：100Hz
1：10Hz
0：4Hz

Use
then use

UP

and
ENT

DOWN

keys to set the analog filter,

key to validate the setting.

To return to the indicated value display, press

40

ESC

key.

5.SETTING OF FUNCTIONS

5-8. Motion Detect
Setting of parameters for detecting stable measurement is required.
If the difference between the current indicated value and that of 100msec before fallwithin the specified range and the status last for a specified time, indicated values are
assumed stable.

Indicated value

Set
range
Time

100mSec

Set period

Whether the indicated value is stable or not is closely related toAutomatic Printing and High and Low Limit Comparator Mode. For
details, see High and Low Limit Comparator Mode on page 33 andAutomatic Printing on page 46

41

5.SETTING OF FUNCTIONS

Setting of Motion Detect
1) Select setting mode 2.
SEL

FNC

2 ) Select motion detect（time）.
DOWN

Press three times.

ENT

Motion Detect(time)（0.0 to 9.9s）

Use

DOWN

UP

ENT

then use

andSEL

keys to set the motion detect（time）

key to validate the setting.

3) Select motion detect（range）.

Motion Detect（range）（00 to 99division）

Use
then use

DOWN

UP

ENT

and

SEL

keys to set the motion detect（range）

key to validate the setting.

To return to the indicated value display, press

42

ESC

key.

5.SETTING OF FUNCTIONS

5-9. Zero Tracking
The Zero Tracking function automatically tracks and compensates a fine shift of the zero
point due to a factor such as a drift.

Setting of Zero Tracking
1) Select setting mode 2.
SEL

FNC

2) Select zero tracking（Time）.
DOWN

Press five times.

ENT

Zero Tracking（Time）（0.0 to 9.9S）

DOWN

UP

Use

ENT

then use

andSEL

keys to set the zero tracking （time），

key to validate the setting.

3) Select zero tracking（range）.
DOWN

ENT

Zero Tracking（range）（00 to 99）

Usethen use

DOWN

UP

ENT

and

SEL

keys to set the zero tracking （range），

key to validate the setting.

To return to the indicated value display, press

ESC

key.

43

5.SETTING OF FUNCTIONS・The Zero Tracking function automatically resets the zero point to zero at a specified
time interval when the zero point move amount is below the specified range.
・The time（tracking delay）is set in units of 0.1 seconds, from 0.1 to 9.9 seconds. The
range（tracking band）is set in units of quarters of the indicated value.（The indicatedvalue 02 corresponds to 0.5 scales and 12, 3 scales.）If the time is set to 0.0 sec. andrange to 00, the Zero Tracking function does not work.

Boundary of zero track

From the point when it returned within the range,
counting will be resumed.

＋+COUNT
0-COUNT

BAND

－
DELAY

Indicated Value

DELAY

BAND=COUNT × the minimum digital scale × 2

RequestThe Zero Tracking works from where the indicated value is zero. It does not work when
the indicated value exceeds the tracking band. In this case,specify the zero point using
the Digital Zero or Zero Calibration.

44

5.SETTING OF FUNCTIONS

5-10. Hold Mode
The TD-240A provides the Peak Hold function to hold and display the peak value（maximum value）of the input signal, and the Sample Hold function to hold and display
an optional point.

Setting of Hold Mode
1) Select setting mode 2.
SEL

FNC

2) Select hold mode.
DOWN

Press seven times.

ENT

Hold Mode
1：Peak Hold
0：Sample Hold

Use

UP

and

DOWN

keys to set the hold mode, then use

ENT

key

to validate the setting.
To return to the indicated value display, press

ESC

key.

45

5.SETTING OF FUNCTIONS

5-11. Automatic Printing
The Automatic Printing function automatically prints out indicated values on a TEAC
printer connected to the TD-240A over the SI/F. Printing is made when indicates vales
are stable. （Parameter for stabilization is set in the Motion Detect function.）The
stabilized indicated value can be held for three seconds（indicated value hold function）.

・Operation of the indicated value hold function

Indicated
value
Hold function …
Indicated value
SI/F
Output signal（HI, LOW）

Near zero0

StableNear zero

Time

OFF

OFF
ON

ON

ON

OFF
ON

ON
※ 3 seconds
Hold↑
Automatic printing※ If the state of Near Zero ON is not keeping for threeminutes, the hold values was not canceled.

46

5.SETTING OF FUNCTIONS

Time

0

Near zero

Indicated
value

OFF

Stable

OFF
ON

ON

ON

OFF

Near zeroONON
3 seconds
Hold↑
Automatic printing

Setting of Automatic Printing
1) Select setting mode 2.
SEL

FNC

2) Select automatic printing.
DOWN

Press eight times.

ENT

Automatic printing
2：Automatic printing ON,

Indicated value HOLD

1：Automatic printing ON
0：Automatic printing OFF

Usethen use

UP

and
ENT

DOWN

keys to set the automatic printing，

key to validate the setting.

To return to the indicated value display, press

ESC

key.

47

5.SETTING OF FUNCTIONS

5-12. Hold Value Printing
The Hold Value Printing function automatically prints out the peak value （held value）
on a TEAC printer connected to the TD-240A over the SI/F.

Setting of Hold Value Printing
1) Select setting mode 2.
SEL

FNC

2) Select hold value printing.
DOWN

Press nine times.

ENT

Hold Value Printing
1：Hold value printed when Holdis canceled
0：No printingUP

Usethen use

and
ENT

DOWN

keys to set the hold value printing.

key to validate the setting.

To return to the indicated value display, press

ESC

key.

If setting Hold Value Printing when the hold value canceled,
Automatic Printing did not work.

48

5.SETTING OF FUNCTIONS

5-13. LOCKThe Setting value LOCK function inhibits changes to setting to prevent changes to set
values or calibrated values through misoperation.

Setting of LOCK
1) Select setting mode 3.
SEL

FNC

SEL

2) Select lock.
DOWN

SelectENT

Hold key
operation

Setting Value LOCK
1：LOCK
0：LOCK released

1：Invalid
0：Valid

Calbration LOCK

1：LOCK
0：LOCK released

Usethen use

DOWN

UP

ENT

and

SEL

Zero key operation
1：Invalid
0：Valid

key to set the lock，

key to validate the setting.

To return to the indicated value display, press

ESC

key.

For setting items locked by using set value LOCK and calibration
value LOCK , see the set value list on page 17.
The Digital Zero function by using theZERO

key on the front

panel is not effective when the Setting value LOCK （calibrated
value）is released（nor is it effective from the rear panel DZ）.
On completion of calibration set the calibration value LOCK.

49

5.SETTING OF FUNCTIONS

5-14. Scale DivisionThis function sets the minimum value of the digital change.
Setting of Scale Division
1) Select setting mode 3.
SEL

FNC

SEL

2) Select scale division.
DOWN

Press twice.

ENT

Scale Division（001 to 100）Usethen use

DOWN

UP

ENT

and

SEL

key to set the scale division,

key to validate the setting.

To return to the indicated value display, press

50

ESC

key.

5.SETTING OF FUNCTIONS

5-15. Display Frequency
The Display frequency function is used to select the times the indicated values are
displayed per second. A/D conversion count is fixed to 100 per second.

Setting of Display Count
1) Select setting mode 3.
SEL

FNC

SEL

2) Select display frequency.
DOWN

Press three times.

ENT

Display Frequency
3： 25/sec.
2： 13/sec.
1： 6/sec.
0： 3/sec.

Usethen use

UP

and
ENT

DOWN

keys to set the display frequency,

key to validate the setting.

To return to the indicated value display, press

ESC

key.

51

5.SETTING OF FUNCTIONS

5-16. Excitation Voltage
This function selects the bridge excitation voltage to be supplied to the strain gauge
sensor.

Setting Excitation Voltage
1) Select setting mode 3.
SEL

FNC

SEL

2) Select excitation voltage.
Press four times.

DOWN

ENT

Excitation Voltage
1： 10 V
0： 2.5V

Set excitation voltage with
with

ENT

UP

and

DOWN

keys and validate it

key.

To return to the indicated value display, press

ESC

key.

CAUTIONUse a strain gauge sensor to be connected to the TD-240A whose
maximum excitation voltage is above the bridge excitation voltage
specified.
If the bridge excitation voltage is greater than the maximum excitation
voltage of the sensor, the sensor may overheat or may be damaged.

52

6HOLD FUNCTION

6 HOLD FUNCTION
6-1. Peak Hold・Peak Hold Operation

Indicated value
Sensor input value

Peak hold section Peak hold release
Time

HOLD

Key input
HOLD LED

LED lighting
Peak hold start

Peak hold reset

53

6HOLD FUNCTION

Indicated value
Sensor input value

Peak hold section Peak hold release
Time

Hold input

HOLD LED

LED lighting
Peak hold start

54

Peak hold reset

6HOLD FUNCTION

・Timing Chart

Indicated value
Sensor input

t3

Time

Hold
input

t4

t1

Display andBCD output
t2

t1： MAX 25mS
t2： MAX 10mS
t3： MAX 25mS
t4： MIN 25mS

t1 ： Time from the short-circuiting of the hold input (OFF → ON) to the display of thepeak hold value.

t2 ： Time until the A/D conversion of the analog value.
t3 ： Time from the input of the hold input (ON → OFF) to the reset of the analog peakhold value.

t4 ： The minimum tracking (resetting) time required for resetting the display of theheld value.

55

6HOLD FUNCTION

6-2. Sample Hold Operation (Digital Hold)・Sample Hold Operation

Indicated value
Sensor input value

Time

HOLD

Key input

HOLD LED

Hold section

LED lighting

Indicated value
Sensor input value

Time

Hold input

HOLD LED

56

Hold section

LED lighting

6HOLD FUNCTION

・Timing Chart

Indicated value
Sensor input

Time

t3

Hold input

t4
t1

Display andBCD output
t2

t1： MAX 25mS
t2： MAX 25mS
t3： MAX 25mS
t4： MIN 25mS

t1 ： Time from the short-circuiting of the hold input (OFF → ON) to the display of thehold value.

t2 ： Time from start of the hold to the A/D conversion of the hold value.
t3 ： Time from the input of the hold input (ON → OFF) to the reset of the analog hold.
t4 ： The minimum tracking (resetting) time required for resetting the display of theheld value.

57

7.DIGITAL ZERO FUNCTION

7. DIGITAL ZERO FUNCTION
This function makes the indicated value zero instantly by a key operation.

Setting of Digital Zero
1) Perform digital zero.
ZERO2) When the indicated value becomes zero, digital zero is completed.

Digital zero will not work when the calibration value LOCK isturned off.
It only works when the calibration value LOCK is turned on.
If you turn off the power, digital zero will be reset.

588.BCD DATA OUTPUT（TD-2403）

8. BCD DATA OUTPUT（TD-2403）
The BCD Data Output Interface is for transferring indication values in BCD (Binary
coded Decimal) from to

PC's PLC's or sequences for controlling, processing andrecording data.
The internal and external circuits are opto-isolated.

8-1. Connector Pin Assignment
Amphenol Connector （36-Pin）
No.

SignalNo.

Signal

1

＊

COM

19

COM

2

Out

1

20

3

Out

2

21

4

Out

4

22

Out

Near Zero

5

Out

8

23

Out

Minus（polarity）

6

Out

10

24

Out

OVER

7

Out

20

25

Out

P.C（stable）

8

Out

40

26

Out

STROBE

9

Out

80

27

In

BCD Data hold

10

Out

100

28

In

Logic Switching

11

Out

200

29

12

Out

400

30

13

Out

800

31

14

Out

1000

32

15

Out

2000

33

16

Out

4000

34

17

Out

8000

35

18

Out

10000

36

＊

Compatible connector is DDK57-30360 or equivalent.

59

8.BCD DATA OUTPUT（TD-2403）

8-2. Logic Switching
The logic Switching function is used to switch between the signal output logics, positive
logic and negative logic. Pin 28 is used for this purpose.
When COM and pin 28 are left open, the negative logic is used. When COM and pin 28
are short-circuited, the positive logic is used.

8-3. Equivalent Circuit
・Output
The signal output circuit employs the TTL open collector output

Vcc

+5V

TD-240A

Vext

Inside outside
Vceo=30V(max)Ic =50mA (max)COM● Internal transistor status● Output pin level

Output data

Negative

Positive

Output data

Negative

Positive

0

OFF

ON

0

Ｈ

Ｌ

1

ON

OFF

1

Ｌ

Ｈ

Through logic switching（pin 28）

60

8.BCD DATA OUTPUT（TD-2403）
・Input

Vcc

Open OFF

TD-240A+5V

InsideOutsideShort

ONTransistor

Ic=Approx. 6mA

SwitchTTL open collector output

COM

＊

注意
・Avoid applying external voltages to the signal input circuit.
・Use external elements which withstands Ic=10mA or above
・Leakage current from external element must be 30μA or below.

8-4. Signal Timing
・P.C
P.C goes on with the BCD data when measurement is stable.

Perform data readapproximately 25msec. after the trailing edge of the P.C

BCD data

P.C

01
25msec. or more

・OVER
Output when LOAD or -LOAD, and OFL1 or OFL2 are specified.

61

8.BCD DATA OUTPUT（TD-2403）
・STROBEBCD data is updated on a per A/D conversion and the strobe pulse synchronous with the
BCD data is output.Use the rising edge of the pulse to read data

BCD data

OVER
0

STROBE1

strobe range

8-5. BCD Data Update Rate Selection

BCD Data Update Rate Selection
1) Select setting mode 4.
FNC

SEL

2) Set the update rate of BCD parallel data output.
DOWN

ENT

BCD Update Rate
0：100 times/sec.
1： 50 times/sec.
2： 20 times/sec.
3： 10 times/sec.
4： 5 times/sec.
5： 2 times/sec.
6： 1 times/sec.

62

STROBE Range
5msec〃
10msec〃25msec〃50msec〃100msec〃
250msec〃
Approx. 500msec

8.BCD DATA OUTPUT（TD-2403）

Normaly，BCD data update synchronous the A/D conversion (100times/sec).
When the BCD input equipment is low ability and can not read out
the high rate of 100 times/sec.，set the BCD data update rate is low.

63

9.RS-232C INTERFACE（TD-2404）

9. RS-232C INTERFACE（TD-2404）
RS-232C interface is used to read out the indicated value and the state of TD-240A andto write set values into TD-240A. It is convenient to connect TD-240A with a computer,a process controller and a sequencer, etc. to make processing such as control,
aggregation, recording and so on.

1
2
3
4
5
6
7
8
9

L
AC IN
N
F.G.

10
11

SER. No.

12
13
14
15
MADE IN JAPAN

9-1. Communication Specifications
9-1-1. Standard
Signal level：Based on RS-232C

Transmitting distance ：Approx.15m
Transmitting method ：Asynchronous，Full duplex
Transmitting speed：1200，2400，4800，or 9600bps selectable

Bit configuration：Start bit 1
Character length 7 or 8 bit selectable
Stop bit 1or 2 bit Selectable
Parity none,odd or even selectable

Code

64

：ASCII

9.RS-232C INTERFACE（TD-2404）

9-1-2. Connector Pin Assignment

Adaptable plug :25-pin D-sub connector
1
2
3
4
5
6
7
8
9
10
11
12
13

＊
out
in
out
in

FG
TxD
RxD
RTS
CTS

＊

SG

14
15
16
17
18
19
20
21
22
23
24
25

out

DTR

9-1-3. About Cables

TD-240A
1
2
3
4
5
8
6
20
7

FG
TｘD
RｘD
RTS
CTS
(CD)
(DSR)
DTR
SG

PC etc…

cross cable
1
2
3
4
5
8
6
20
7

FG
TｘD
RｘD
RTS
CTS
CD
DSR
DTR
SG

※ The avobe diagram is for connecting a personal computer as a DTE(Data Terminal
Equipment)device.
If it is a DCE (Data Circuit-terminating Equipment)device,connect pin to pin (DTR
to DTR, DSR to DSR etc.)※ Cables should be prepared after checking connector type and pin assignments of theconnected device.

65

9.RS-232C INTERFACE（TD-2404）

9-2. Setting RS-232C Interface
This will set the RS-232C communication conditions of TD-240A.

Setting of RS-232C
1) Select setting mode 4.
SEL

FNC

Press three times.

2) Select RS-232C.
DOWN

Press twice.

ENT

Stop Bit

CommunicationMode

1： 2bit
0： 1bit

2： Communication Mode 2(transmits when printed)

Parity Bit
2： Even number
1： Odd number
0： None

1：Communication Mode 1(transmits continuously)

0： Communication Mode 0(performs communication
by a command)

Character Length
1： 8bit
0： 7bitBaud Rate
3： 9600bps
2： 4800bps
1： 2400bps
0： 1200bps

3) Input RS-232C with
it with

ENT

UP

DOWN

and

keys and validate

key.

To return to the indicated value display, press

66

SEL

ESC

key.

9.RS-232C INTERFACE（TD-2404）

9-3. Communication Mode
1. Communication Mode 0This mode performs communication by a command from the host computer.
In this mode, you can read out the indicated value, status, set values and write in set
values.

2. Communication Mode 1
This mode continuously transmits the indicated values and the status.

3. Communication Mode 2This mode transmits the indicated values when they are printed.

9-4. Communication Format
1. Communication Mode 0・Reading Out the Indicated Value (the sign, indicated value with 5 digits and decimal point)
Host

R

A CR
R

TD-240A

A

＋

1

0

0

.

0

0 CR LF

D

0

0

0

0

0

0

0 CR LF

・Reading Out the Status (seven digits)
Host

R

D CR
R

TD-240A

Hold

1:ON
0:OFF

Stable1:ON
0:OFF

Near zero output signal 1:ON
HI output signal 0:OFF
HI

1:ON

LO output signal 0:OFF※ Undefined

LO

1:ON

OK

1:ON

output signal 0:OFF
output signal 0:OFF

67

9.RS-232C INTERFACE（TD-2404）
・Write in of the set value

High Limit

W

0

1

CR LF （Set value

Low Limit

W

0

2

CR LF （Set value

LOCK）

LOCK）

High/Low Limit
Comparison Mode

W

0

3

0

0

Hysteresis

W

0

4

0

0

0

0

0

CR LF （Set value

LOCK）

CR LF （Set value
LOCK）

CR LF （Set value

W

0

W

0

Digital Filter

W

1

1

0

0

0

0

0

CR LF （Set value

Analog Filter

W

1

2

0

0

0

0

0

CR LF （Set value

Digital Offset

Near Zero

5

LOCK）

6

CR LF （Set value

0

LOCK）

LOCK）

LOCK）

MD（stable time）

W

1

3

0

0

0

0

CR LF （Set value
LOCK）

MD（stable band）

W

1

4

0

0

0

0

CR LF （Set value
LOCK）

Zero Tracking（time） W

1

5

0

0

0

0

CR LF （Set value

Zero Tracking（band） W

1

6

0

0

0

0

CR LF （Set value

Hold Mode

1

7

0

0

0

0

W

LOCK）

LOCK）

0

CR LF （Set value
LOCK）

Automatic Printing

W

1

8

0

0

0

0

0

CR LF （Set value
LOCK）

Hold Value Printing

W

1

9

0

0

0

0

0

CR LF （Set value
LOCK）

Set value No.

Max 5digits

Sign bit
0：In signed setting, this will be recognized
as plus.
－：This will be recognized as minus.
※ Do not put other than zero into a place which is set zero.

689.RS-232C INTERFACE（TD-2404）

CR LF

LOCK

W

2

1

0

0

Scale Division

W

2

2

0

0

0

0

0

CR LF

Display Frequency

W

2

3

0

0

0

0

0

CR LF （calibration

Excitation Voltage

W

2

4

0

0

0

0

0

CR LF

BCD Data Update Rate

W

3

1

0

0

0

0

0

CR LF （calibration

RS-232C

W

3

2

0

D/A Zero Setting

W

3

W

3

D/A Full Scale Setting（calibration
LOCK）

LOCK）

（calibration
LOCK）

LOCK）

CR LF

（calibration
LOCK）

3

CR LF

（calibration
LOCK）

4

CR LF

（calibration
LOCK）

Set value No.

（calibration
LOCK）

Max 5digits

Sign bit
0：In signed setting, this will be recognized
as plus.
－：This will be recognized as minus.

※ Do not put other than zero into a place which is set zero.

It is impossible to write Ｗ ２４ and Ｗ ３４ .

・Reading out Set Values

Host
TD-240A

Ｗ

CR

Set value No.

Ｗ

CR LF

Set value No. The same format as write-inof set values.

69

9.RS-232C INTERFACE（TD-2404）
・Command (host → TD-240A)Hold

Ｃ Ｅ CR

Hold ResetＣ Ｆ CR

Digital ZeroＣ Ｇ CR

Digital Zero ResetＣ Ｈ CR (This is effective only when the calibration
value LOCK is "1.")Print Instruction

Ｃ Ｉ CR(This is effective only when the calibration
value LOCK is "1.")(This will issue print a command
onto SIF.)

2. Communication Mode 1
This mode will continuously transmit the indicated values.

0

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15 16 17 18 19

GS， *1 ， * 2 ， * 3 ， * 4 ， ±Sign＋ or －HEADER

CR LF
Five digits of the indicatedvalue and decimal point

3. Communication Mode 2This mode will transmit when the indicated value is printed.

0

1

2

G

S

， *1 ， * 2 ， * 3 ， * 4 ， ±HEADER

70

3

4

5

6

7

8

9 10 11 12 13 14 15 16 17 18 19
Sign＋ or －CR LF
Five digits of the indicatedvalue and decimal point

9.RS-232C INTERFACE（TD-2404）＊1
O........ Over Load（LOAD，OFL）
S ........ Stable
M....... Not Stable
H........ Hold
＊ 1 Priority

H ＞ O ＞（Ｓ or Ｍ）＊2
A........Zero Tracking OFF
T ........Zero Tracking ON＊3
H........High Limit ON
L ........Low Limit ON
G........High / Low Limit OFF
N........High / Low Limit ON
F ........Compare OFF＊ 3 Priority

N ＞（H or L ） F ＞ G＊4
N........Zero Near OFF
Z ........Zero Near ON

71

10.D/A CONVERTER（TD-2407）

10. D/A CONVERTER（TD-2407）
This is a converter to obtain an analog output which is linked with the indicated values of
TD-240A.
The range of the analog output is from 0 to +10V for the voltage output or from 4 to
20mA for the constant current output.
For any digital value you have set with the D/A zero setting and the D/A full scale setting
functions, you can obtain from zero (0V, 4mA) to full scale (+10V, 20mA) of analog
output.
The output circuit and the main circuit are isolated. The resolution is 1/3000 for thevoltage from 0 to +10V and the conversion rate is 100 times per a second. The output
has an overrange of about ± 10%FS.

1
2
3
4
5
6
7
8
9

L
AC IN
N
F.G.

10
11
12
13
14
15
MADE IN JAPAN72

SER. No.

V OUT
I OUT

These are terminals to obtain
voltage or current signal of thevoltage/current output terminal.
+ is for signal and - for ground.
You can obtain voltage from 0
to +10V or current from 4 to
20mA.

10.D/A CONVERTER（TD-2407）

10-1. Obtaining Voltage Output Signal
Use + and - terminals of TD-240A connecting to them an external equipment (with load
resistance of 2KΩ or more).

TD-240A← Inside

Outside →

＋

SIG

＋
External equipment－－

Load resistance: 2KΩ or more

GND

10-2. Obtaining Current Output Signal
Use + and - terminals of TD-240A connecting to them an external equipment (with load
resistance of 350Ω or less).
TD-240A← Inside

Outside →

＋

SIG

＋
External equipment－－

Load resistance: 350Ω or less

GND

73

10.D/A CONVERTER（TD-2407）

10-3. About Resolution
The D/A converter has the resolution of 1/3000 for 0 to 10V (4 to 20mA).

CAUTION
・The D/A converter is an option.
・Do not apply voltage externally. If you do, it will break down.
・Do not short-circuit the voltage output. Short-circuiting may
cause failure. Connecting a capacity load might cause oscillation.

74

10.D/A CONVERTER（TD-2407）

10-4. Setting D/A Zero Full Scale
This will set the D/A zero full scale of TD-240A.
Setting D/A Zero Full Scale
1)Select setting mode 4.
SEL

FNC

Press three times.

2)Set D/A zero.
DOWN

Press three times.

ENT

D/A Zero Value (00000 to ± 19999)

Set D/A zero with
SHIFT
CAL

SEL

and

keys. Press

key to put minus sign. When you have made setting, validate it
ENT

with

DOWN

UP

key.

3）Set D/A full scale.
DOWN

Press one times.

ENT

Set D/A full scale with
SHIFT
CAL

with

UP

DOWN

and

SEL

keys. Press

key to put minus sign. When you have made setting, validate it

ENT

key.

75

10.D/A CONVERTER（TD-2407）

10-5. About D/A Output Error
This is an error which is output only when D/A option is provided.

D/A output is less than the range of output.

For current output: 4mA - 25% or less (about 0mA or less)
For voltage output: 0V - 25% or less (about -2.5V or less)

The D/A output exceeds the range of the output.

For current output: 20mA + 25% or more (about 24mA or more)
For voltage output: 10V + 25% or more (about 12.5V or more)76

11.DC POWER SOURCE

11. DC POWER SOURCE
By specifying at the time of shipment, TD-240A can be used with DC power supply.

1
2
3

Red
Black

4
5
6
7
8
9

＋
ＤＣＩＮ
DC IN
－

F.G.
10
11

SER. No.

12
13
14
15
MADE IN JAPAN

Connect the positive (+) side of the power source to the red screw side of the terminal
block on the back of the TD-240A, and its negative (-) side to the black screw side.

Input voltage range ( voltage between terminals of the F340A)
DC12 ～ 24V（± 15%）

CAUTIONBe aware that the voltage drops depending on the wire thickness and length.
Also, never input an AC power source. Doing so will cause a failure.

Power consumption
15W max
RequestUse a source power (or battery) of 3A DC or more.

77

12.OVERSCALE/ERROR DISPLAYS

12. OVERSCALE/ERROR DISPLAYS
12-1. Overscale Display

Minus overflow of the A/D converter（under -3.2mV/V between ± SIG）
Plus overflow of the A/D converter（over 3.2mV/V between ± SIG）
Indicated value overflowed（indicated value<-1999）
Indicated value overflowed（indicated value>1999）

12-2. Calibration Error Display

Span set value is "00000"
Output of the strain gauge sensor does not reach the span
adjustment range.
Output of the strain gauge sensor is on the minus（negative）side.

78

13.SELF-CHECK FUNCTION AND INITIALIZATION

13. SELF-CHECK FUNCTION AND INITIALIZATION
13-1. Self-Check
The TD-240A incorporates the Self-check Function to detect errors in the internal
circuits and in programs and the Visual-check Function to visually check the indicator.

Setting Method
1）Turn off the power to the TD-240A.
2）Turn on the power withESC

key held down.

The self-check is completed in 30 seconds. The display "" should appear, thenthe indicate value should follow.This ensures that the TD-240A is in normal operation.

79

13.SELF-CHECK FUNCTION AND INITIALIZATION

Self-check（Visual-Check Sequence）

80

13.SELF-CHECK FUNCTION AND INITIALIZATION

13-2. Initialization
The Initialization is an operation to reset the memory to the factory setting. This
operation resets all set values except calibrated values（obtained through zero calibrationand span calibration）to the factory setting

Setting Method
1）Turn off the power to the TD-240A.
2）Turn on the power with

ESC

and

ENT

keys held down．

The initialization follows the self-check.

81

13.SELF-CHECK FUNCTION AND INITIALIZATION

Initialization Sequence

82

+12V

SI/F 用F.G

Isolation+5V +5V

VCC

Referrence
Voltage

Excitation
VoltagePower Supply Unit

+12V -12V

FRAME

－ EXC

＋ EXC

－ SIG

＋ SIG × 100

Low-pass
Fillter

FRAME

F.G

N

L
AC IN

A/D
Conversion

BufferGND

VOL OUTKey Input

Display
LED

Port

Serial
Port

Port

MPU
16bit

CPU

Serial
Port

Port

BCD

SI/F

Parallel
Output2Line

Parallel
Input
2Line

D/A

RS-232CRAM
4KbyteFlash
ROM 128K

Watch
Dog

SIF

LO

HI

DZ

HOLD

NOV.RAM
1024bit

13.SELF-CHECK FUNCTION AND INITIALIZATION

13-3. TD-240A Block Diagram83

14.DIMENSIONS

14. DIMENSIONS

HI

OK

LOW

PEAK

HOLD

OPTIONOPTION
BCO
BCO
232
232
DAC
DAC

96

F340A

DIGITAL
INDICATOR

TD-240A

B.V
10V
2.5V
B.V
10V
F340A
2.5V
100 - 240V ~DIGITAL
TRANSDUCER INDICATOR

UP

DOWN

HOLD

FNC

SEL

ZERO

DIGITAL
INDICATOR

50 - 60Hz
15W

GAIN
SHIFT

ENT

MADE IN JAPAN

11
22
33
HI
HI
44
55
LO
LO
66
77
HOLD
HOLD
88
DZ
DZ
99
10
10
VOLOUT
OUT
VOL
GG 11
11
+EXC
+EXC
12
12
-SIG
-SIG
13
13
-EXC
-EXC
14
14
+SIG
+SIG
15
15
SI/F
SI/F

F.G

F.G

ESC

CAL

96

13

122

2.5

（Front）（Side）

R5
4-

4-

R3

以下

1
2
3
4
5
6

91

8
9

L

AC IN
N

92 +1
-0

7

Panel cut out dimensions

F.G.
10
11

SER. No.

12
13
14
15

2.5

MADE IN JAPAN

2.5

91

2.5

92 +1
-0

（Rear）

Unit：mm84

15.SPECIFICATIONS

15. SPECIFICATIONS
15-1. Analog Section
Bride Voltage

DC 10V ± 10％
DC 2.5V ± 10％
Output current of ｍax 30mA
Changable by setting key Pad

Signal input range－ 3.0 to 3.0mV/V

Equivalent input calibration range 0.5 ～ 3.0mV/V

Equivalent input calibration error ＜ 0.1％FS（0.5mV/V input）

Actual load calibration range

0.5 ～ 3.0mV/V

Zero adjustment range

0 ～± 2.0mV/V

Analog input signal sensitivity

1μV/count

AccuracyNon-linearity：＜ 0.02%FS（of 3mV/V input）
Zero drift：＜ 0.5μV/ ℃
Gain drift：＜ 25ppm/ ℃

A/D converter

100 times /sec. Resolution：16 bits （binary）

Analog filter

4Hz，10Hz，100Hz（Initial），3ｋHz
Changable by setting key pad

Peak hold function （high-speed analog hold system）
Operation response speed：Approx. 1kHz
（Sin wave : 3mV/V input，Analog Filter.3kHz）
Accuracy： ＜ 0.1%FS
Reset time：＜ 50μS

85

15.SPECIFICATIONS

15-2. Indicator Section
Indicator

Items

Numeric display （5 digits）, 15mm in height, red LED
Numeric

5digits ±Indicatid value－ 19999 to 19999

Decimal point

Selectable

Status

HI，OK，LOW，PEAK，HOLD
Red LED 5

Count

3，6，13，25times/sec. Selectable15-3. Setting Section
Items

Calibration：Zero/Span calibration （actual load calibration,equivalent input calibration）
High limit value，Low limit value，High/Low limit comparison mode，
Hysteresis, Digital offset, Near zero，Digital filter, Analogfilter，Motion detect, Zero tracking, Hold mode，Automatic printing，Hold value printing，LOCK，Scale division，Display frequency,
Excitation Voltage，BCD data update rate，RS-232C，D/A converter
setting，D/A converter fullscael setting.

15-4. External Signals
High limit relay，Low limit relay，Analog voltage output，Hold signal input, Digital zero signal input.

15-5. Interface
SI/F output

86

15.SPECIFICATIONS

15-6. Option
・TD-2403

BCD Parallel data output

・TD-2404

RS-232C Interface

・TD-2407

D/A Converter

15-7. General Specifications
Power voltage- AC spec: 100V to 240V AC ( ＋ 10% － 15%)

[Free power supply 50Hz/60Hz]- DC spec: 12V to 24V DC ( ± 15%)
(Depending on the request at the time of order)

Power consumption- AC spec: 15W max.
- DC spec: 15W max.

Rush current (Typ)20A, 2.5 msec.: 100V AC mean load state(ordinary temperature, at cold-start time)
40A, 2.5 msec.: 200V AC mean load state(ordinary temperature, at cold-start time)Ambient conditions

Temperature：Operation
Storage－ 10 to ＋ 40 ℃
－ 40 to ＋ 80 ℃

Humidity：＜ 85％RH（non-condensation）

Dimensions

96W × 96H × 135D（mm）（excluding protrusions）

Panelcutout dimension 92 × 92 ＋ 1（mm）－0

WeightApprox.0.9kg

87

15.SPECIFICATIONS

15-8. Accessories
・AC power cord. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
・Mini screwdriver for terminal board connection . . 1
・Ferrite core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
・3P － 2P conversion adapter . . . . . . . . . . . . . . . . . 1
・BCD Output connector . . . . . . . . . . . . . . . . . . . . . 1（when BCD option is supplied）
・TD-240A operational manual

8816.CONFORMITY TO EC DIRECTIVES

16. CONFORMITY TO EC DIRECTIVESThe TD-240A digital indicator conforms to EC directives (based on the EC council ofministers), carrying a CE mark.
- Low voltage directive:

EN61010-1- EMC directive:

EN61326-1
EN55011，EN61000-4-2，EN61000-4-3，EN61000-4-4
EN61000-4-5，EN61000-4-6，EN61000-4-8
EN61000-4-11，EN61000-3-2，EN61000-3-3

When installing, attention should be given to the following.
1. Since the TD-240A is defined as an open type (built-in equipment), be sure to install
the TD-240A and fix to a panel or the like for use.
2. Use the attached power cable.
3. Use shielded cables for others (load cell, external I/O, option).

Attachment of a ferrite core
It is necessary to twist a power supply cable and sensor cables, such as a load cell,around an attached ferrite core.（Common to AC spec. and DC spec.）

A cable is twisted arounda ferrite core.（One roll）

Ferrite core

TD-240A

power supply cable
Load cell89

16.CONFORMITY TO EC DIRECTIVES
Connection of Lightning serge protect
The F340A main body conforms to EMC directive EN61000-4-5 (lightning surge
immunity) in combination with the lightning surge protect.

● AC Spec.
TD-240A

Lightning surge protect The cable of the EU outlet shape is required for connection
MAINTRAB MNT-1Dof lighting serge protect. (Option)＊ MAINTRABCONTACT.

MNT-1Dis a trademark of PHOENIX● DC Spec.
TD-240A

Lightning surge protect
PT 2-PE/S-24AC-ST

PT-BE/FM（DIN rail attachment type）＊ PT-BE/FM、PT 2-PE/S-24AC-ST is a trademark of
PHOENIX CONTACT.

This lightning surge protect is not a standard accessory (optionally available).
Purchase it from PHOENIX CONTACT or us.

90

TEAC INSTRUMENTS CORPORATION
83 IMAIKAMIMACHI, NAKAHARA-KU, KAWASAKI JAPAN
Phone：(044)-711-5221
Fax：(044)-711-5240