RoHS

READ THE INSTRUCTION MANUAL BEFORE USINGINSTRUCTION MANUALMANOSTAR DIGITAL SENSOR
EMD8A066

No. TR-EMD8A066-E01

1-2-3,Nishi-shiriike-cho,Nagata-ku,Kobe,Hyogo 653-0031 JAPANTEL. +81（78）-631-6000 FAX. +81（78）-631-6020

TABLE OF CONTENTS
PAGE

INTRODUCTION .............................................................................................................................. 1

Ⅰ．PRECAUTIONS .............................................................................................................. 2
Ⅱ． SPECIFICATIONS
1．Outline drawing .......................................................................................................... 3
2．Function
2-1 Display function ................................................................................................. 4
2-2 Digital communication function (MODBUS) .......................................... 5
2-3 Max. and min. value memory function...................................................... 5
2-4 Function of low power consumption ........................................................ 5
2-5 Function of test mode .................................................................................... 5
2-6 Function to clear set value .......................................................................... 5
2-7 Function of set value protecting................................................................ 6

Ⅲ．INSTALLATION
1．Installation conditions ............................................................................................ 6
2．Installation of instrument .................................................................................... 6
3．Wiring................................................................................................................................. 6
4．Piping
4-1 Measured pressure and connection of piping ...................................... 8
4-2 Piping material .................................................................................................... 9
4-3 Caution of piping ............................................................................................... 9

Ⅳ． OPERATION
1．Before trial running .............................................................................................. 10
2．Operation panel....................................................................................................... 10
3．How to operate
3-1 Change-over procedure of mode ........................................................... 10
3-2 Basic operation in each mode .................................................................. 13
3-3 Operation of test mode ............................................................................... 14
3-4 Calibration for zero adjustment ............................................................... 14

4．MODBUS communication
4-1 Communication specifications ................................................................. 15
4-2 Communication setting................................................................................ 15
4-3 Structure of message frame ..................................................................... 15
4-4 Message examples......................................................................................... 15
4-5 MODBUS address map................................................................................ 18
4-6 Status history list .......................................................................................... 19
4-7 List of communication error history ..................................................... 19

Ⅴ．INFORMATION ON SOFTWARE .............................................................. 20
Ⅵ．PRODUCT WARRANTY ...................................................................................... 21

INTRODUCTION
Thank you very much for purchasing of “MANOSTAR DIGITAL SENSOR EMD8A”.

Features
・Compact size
This instrument is a compact digital micro differential pressure gage composed of the diaphragm type detection part anddisplay part incorporated in 24 × 48 size.
・Digital communication input/output (MODBUS)
Thanks to the compatibility with RS-485 (MODBUS/RTU), it is possible to acquire measurement values as digital values
and change settings from a remote location.
・Employing an easy-to-see large seven segments LED
Red-colored seven segment LED, 12 mm high character of high visibility, is used for 3･1/2 digits.
・Simple operability
This machine, designed for dedicated to pressure measurement, has simple operation set menu.
・Low power consumption
The electric power consumption is reduced by lowering the display luminance of LED.
・Setting value protecting function
It prevents a setting value to mistake by incorrect operation.
・Test mode function
Even when pressure is not actually applied, by setting a simulated pressure, it is possible to check the operation at the timeof installation and inspection.
・Max. and min. value memory function
Max and min value of the measurement pressure are retained and it displays it.

△！

CautionTo ensure your safety in using this instrument:
・Be sure to read the instruction manual carefully before using this instrument so that you can use
it properly.
Wrong use may result in failure of this instrument and lead to its damage and accident.
・This manual should be kept in a proper place so that you can refer to it any time you need.

1

Ⅰ．PRECAUTIONS△Warning！

・Do not use the instrument where flammable gas is present.
The instrument is not explosion-proof. Do not use instruments in the circumstance where flammable gas is present. It
may cause explosion.
・Do not use the instrument at the place where corrosive gas is present.
he instrument is not corrosion resistance construction. Measuring corrosive gas may corrode the receiving element andhousing material of the instrument. It is expected that corrosive gas leaked out of the instrument will harm a person.
・Do not apply the pressure to the instrument more than it can withstand.
The diaphragm and the retainer are broken and cause of injury or accident, etc. disaster if the pressure exceeding
withstanding pressure of the pressure receiving element is applied to the instrument. The case body and the transparent
cover of the instrument are broken and cause of injury or accident, etc. disaster if the pressure exceeding withstanding
pressure of the instrument body is applied to the instrument.
・The instrument is measurable for air and non-corrosive gas only.
The machine is exclusive use of dry air (85%RH or less). Using measuring the water or oil it may be damaged and causes
the accident.
・Avoid using where instrument is exposed to many vibration and impact.
Using this instrument where intensified vibration and impact may be damaged instrument. It is expected that gas leaks of
instrument which harms a parson.
・Do not exceed rated voltage in using.
Using this instrument by exceeding rated voltage may cause fire or electric shock.
・Wire correctly.
Incorrect wiring may cause fire.
・Do not exceed rated surrounding temperature, humidity and altitude in use.
Using this instrument by exceeding rated surrounding temperature and humidity and altitude it may be damaged andcause the accident.
・Do not disassemble or reconstruct your instrument.
It may void your warranty.

△Caution！

・Operate the keys on the operation panel with the fingers.
Pressing a key with a hard or sharpened object may damage or break the surface of the key, possibly leading to a failure.
・As to where to install and how to install the instrument, be sure to follow the instruction manual so as to ensure a proper
method.
・Use the instrument indoors.
・In case of not being installed in dry and well-kept clean locations, the instrument must be enclosed in box.
・Keep as great a distance as possible from a device that generates strong electromagnetic fields, and then use thissensor.
If the surrounding area of the installation location has a strong electromagnetic field, the pressure indication accuracy
may be lowered.
・As the DC power supply to be connected to this sensor, use NEC (National Electrical Code) Class 2 power supplies or
LPS (Limited Power Source) power supplies.
・Do not use organic solvent for cleaning.
Use of organic solvent, such as thinner and benzene, to remove surface dirt and stain may cause melting and cracking on
the surface. To remove dirt and stain, be sure to wipe them off with a wet cloth using diluted neutral cleanser.
・Dropping the product.
Product is a precision instrument. If you drop the product, there is a possibility that the exterior, also the interiormechanism damage.
・Removal of the piping
If you replace the old pipes, please do not pull the pipe with a strong force. There is a possibility that the pipe cap isbroken.

2

Ⅱ． SPECIFICATIONS
1．Outline drawing
Fig.2-(1) EMD8A066

outline drawing

（

3

）

2．Function
The pressure sensor of this product can measure differential pressures. If the pressure on the H side is higher than thatof the L side, the pressure display shows a positive value.
This sensor performs A/D conversion of the signal from the pressure sensor, then performs zero compensation andmovement average processing, and finally displays the value and performs the digital communication output.
Fig.2-(2) Function block diagram
LED display
Movingaveragefor display

AmplifierPressure sensor

A/D
converting

Movingaveragefor output

Value to bemeasured processing
Zero correction

RS-485
communication
circuit

Digitalcommunication

2-1 Display function
1）Display filter
The number of the moving average filter for display is set in the display filter setting mode. When the change ofthe measurement pressure is large, the change of the display value can be reduced by enlarging the average
number of the moving average function. The response is late according to large a set value of the filter mode.
It is possible to independently set the movement average filter for display use and that for digital communication
output use.
When the instrument is shipped from our factory, is set to standard "1.0 sec.".
Display filter mode

Average processing (Response time)

F0.2

High speed (0.2 sec.)

F1.0Standard speed (1.0 sec.)

F2.0

Low speed 1 (2.0 sec.)

F4.0

Low speed 2 (4.0 sec.)

Setting value

2）Overrange warning
The display pressure "FFF" and informs of the over range when pressure which exceeds the ratings pressure
joins in this instrument. The display pressure "-FFF" when the difference pressure is negative.
・Over range pressure
Mono (single) pressure range： 110% or more and -10% or less of the ratings pressure.
Zero center (+-) pressure range： 60% or more and -60% or less of the ratings pressure.
3）Function of display low cut
It is a mode that compulsorily sets the indicated value to 0 when the measurement pressure indicated value isabout 0. When setting value is “CT2” (2%FS), the value of less than ±2%FS becomes 0 displays. Please set
CT0 (0%FS) when you do not use the function.
The low cut function applies only to the displayed value and does not affect the digital communication output.
4）Function of sign reversal of display measured
The sign of the display of the pressure display mode and the max and the min value display mode is inverted. Thisfunction is used to invert the sign when negative pressure is measured. Please refer to P.8 “4-1 Measured
pressure and connection of piping“ for the usage of this function.

4

2-2 Digital communication function (MODBUS)
1）Digital communication (input/output)
By means of RS-485 (MODBUS/RTU) communication, it is possible to acquire pressure measurement values,
execute zero adjustment, and change the various settings.
For the items and effective value ranges, refer to P.18 “4-5 MODBUS address map“.
2）Output filter
The number of the moving average filter for digital communication output is set in the output filter setting mode.
When the change of the measurement pressure is large, the change of the output value can be reduced byenlarging the average number of the moving average function. The response is late according to large a set valueof the filter mode. It is possible to independently set the movement average filter for display use and that for
digital communication output use.
When the instrument is shipped from our factory, is set to standard "1.0 sec.".
Output filter mode

Average processing (Response time)

F0.2

High speed (0.2 sec.)

F1.0Standard speed (1.0 sec.)

F2.0

Low speed 1 (2.0 sec.)

F4.0

Low speed 2 (4.0 sec.)

Setting value3）Function of sign reversal of digital communication output
This function inverts the signs of pressure measurement value, maximum value, and minimum value, and thenoutputs them. This function is used to invert the sign when negative pressure is measured. Please refer to P.8“4-1 Measured pressure and connection of piping“ for the usage of this function.
2-3 Max. and min. value memory function
Each value is displayed and the max. value and the min. value of the pressure measurement value can be reset in
the max. value memory display mode or the min. value display mode. the max. value and the min. value memory is
reset once the power supply to this sensor is turned off.
2-4 Function of low power consumption
The electric power consumption is reduced by lowering the display luminance of LED. It is not influenced aboutother functions at all. The display luminance only at the pressure display mode falls and other program modes etc.
become usual luminance’s when the function is on.
2-5 Function of test modeThis function tests whether the parameter setting is correctly set when the device is set up and checked. In thismode, simulative pressure can operate the device without applying actual pressure. This function is used to checkthe operation by changing the simulative pressure. The simulative-pressure-value is automatically set topresent-pressure-value at the time of shifting to test-mode. A simulative setting pressure is not preserved. The
display blinks for the test mode recognition when shifting to the test mode. It is recognized that the blinking
display is not a pressure display mode. The pressure display mode by the passage of 15 seconds in the no operation
time doesn't return in this mode automatically.
2-6 Function to clear set value
In the setting clear mode, it is possible to revert the setting values in each mode to the factory default setting
values.
For the factory default setting values, refer to P.12 “Mode table“.

△！

Caution

Performing setting clear deletes the current setting values.

52-7 Function of set value protecting
It becomes impossible to change set value by each program mode when set value protecting is set. It prevents a set
mistake by the miss operation etc. etc. Please release protecting only when the setting change is necessary.

Ⅲ．INSTALLATION
1．Installation conditions
The following places should be avoided for installation of this unit.
・Don't install where there are intense vibration and impact are applied to this unit.
・Don't install where there is sudden fluctuation of surrounding temperature or place where this unit is exposed todirect sunlight.
・Don't install where high humidity exists, where water or oil splashes over the unit or where there is much dust.
・Don't install where corrosive gas or flammable gas is generated.

2．Installation of instrument
Insert EMD8A body into the panel hole and press the flange of EMD8A enough against the panel so that it hits the panel
surface.

△！

Caution・installation position : Vertical only.

3．Wiring
External connection diagram is shown in Fig.3- (1). The connection example when an external equipment is connected
is shown in Fig.3- (2).
When using MODBUS communication, it is possible to connect multiple pieces of this sensor to a single master.
(According to RS-485 standard, it is possible to connect 31 pieces of this sensor at maximum.)While the maximum communication distance is 500 m, it varies depending on the installation conditions (number ofconnected products and noise environment).
Connect a terminating resistor at the end of the line as necessary.

△！

CautionFig.3-(1)・Do not let rating of each terminal go beyond the specifications.
・When wiring, be sure to separate the wiring from the wiring of power supply.

External connection diagram EMD8A066

type
CN1-1
CN1-2
CN1-3
CN1-4
CN1-5
CN1-6

6

Power supply +（12 to 24 VDC）
Power supply -（0 V）
RS-485 A+
NC（unused）
NC（unused）
RS-485 B-

Fig.3-(2)Example of connection EMD8A066

type

Accessory
・RITS plug connector 6P (produced by TE Connectivity)
Applied cable
Product code

Color of cover

1473562-6

Yellow△！

CautionNominalO.D of the wire covercross-sectional areas
0.1

0.5mm21.0

1.15mm・For crimping wire to connector, a RITS plug connector must be used.
・RITS plug connector is not compatible to other manufacturer's connector because it is not compliant
with the industry standard "e-CON". (The standard "e-CON" is only used in Japan.)・For crimping wire to connector, a specific RITS plug connector (TE Connectivity),
product number 1729940, must be used.
・For further inquiry on the detail of RITS plug connector and the other tools, please contact
TE Connectivity directly.

7

4．Piping
The instrument, a differential pressure gage, is provided withtaps at the rear side : one for high pressure (HIGH) and theother for low pressure (LOW).
Depending on the application and use, connect piping as follows.
4-1 Measured pressure and connection of piping
Please connect the piping shown in the table below according
to the measured pressure, and set the function of inverting
sign of measurement display.

Fig.3-(4) Layout of tube tap

Low pressure
side tube tap(LOW)High pressure
Side tube tap(HIGH)

Measurement pressure

Differential pressure

Usage

Differential pressure
measurement

Positive pressure
measurement

Negative pressure
measurement

High pressure side
tube tap
HIGH

Measurement pressure(high)

Measurement pressure(positive pressure)Open to atmosphere

Low pressure side
tube tap
LOW

Measurement pressure(low)Open to atmosphere

Measurement pressure(negative pressure)

Function sign reversal of
display measured

oFF

oFF

on

Function of sign reversal of
digital communication output

oFF

oFF

on

Piping△！

CautionGage pressure

For gage pressure measurement with the instrument of zero-center range (+ -) , connect piping to highpressure tap in order to match symbol on the display (+ , -) and the actual polarity inside the tubingpressure.
For zero-center range (+−) , unless there is a special reason, set P.4 “Function of sign reversal of
display measured“ and P.5 “Function of sign reversal of digital communication output“ to OFF.

Fig.3-(5)△！

CautionWhen one side of tap is open toatmospheric air, be sure to provide air ventat the outside of panel, or the port released
and open in the panel (box of device etc.) ,has been exposed to in-panel pressure
generated by air flow to cool down inside ofpanel forcibly by fan, etc.

84-2 Piping material
For tubing material used for taps of this unit, be sure
to use tubing material of I.D 4.
Vinyl or rubber tubes are suitable.
As shown in Fig.3-(6), when inserting the piping into
the tap, be sure to push it in until the piping hit thebottom of tap.

Fig.3-(6)EMD8A body
Vinyl, plastic orrubber tube

Tube tap

Fig.3-(7)△！

CautionWhen connecting or disconnecting the piping
to the tube tap, please be sure to grasp thesides of case (the shaded area in Fig.3-(7))
firmly with your fingers.
Do not apply strong force to either the top or
bottom surfaces of the case.

4-3 Caution of piping
Prohibition of common piping
Piping each of pressure detectors and pressure receiving
instruments tube exclusively dedicated for it, and do notconnect the piping commonly with the adjacent system asshown in Fig.3-(8).
Errors caused by long distance piping
The speed of response is delayed when the product is used
for remote monitoring. In such application, the I.D. of theconnection tube should be as large as possible.
If the piping conditions of the high and low pressure side
are significantly different, the difference in the piping
resistance between high and low pressure side causes thedifference in pressure transmission time, and themeasurement becomes inaccurate.

Fig.3-(8)Prevention of clogging at tubes caused by drain･If drain remains within the line, it causes measurement error. Be sure to install the pressure receiving instrument
above the pressure outlet port of the pressure detector and arrange the line so that the drain water should not
remain in the slack piping.
･If the arrangement mentioned above in not possible, install a drain tank and clean it once in a while.
･After the cleaning of the tank, check that the air tightness is fully kept.

9

Ⅳ． OPERATION
1．Before trial running
Before supplying power to this unit for the first time after installation, take care of the following matters.
1）Make sure again of the followings and see if they are correct: location of installation, environment and how the
instrument is installed, wiring and piping etc.
Supplying power with wrong wiring and piping may lead to instrument failure and accidents.
2）Before supplying power, take measures on other devices and the machine in which this sensor is incorporated so thatthey will not be affected.

2．Operation panel
Fig.4-(1)Display and key function

Comparison output 1 display(Not in use)

Pressure and mode indicator(3・1 / 2 digits segment LED)

Comparison output 2 display(Not in use)

Enter Key:
Register set value of each mode.
By pressing, the display blinks twice
to notify registration.

Mode Key:To change the mode

Down Key:To lower the numerical value ofsetting value of each mode.
One pushing up or down key changes
Figure one by one and continuous pushingup or down key changes figure continuously.

Up Key:To raise the numerical value ofsetting value of each mode.

3．How to operate
3-1 Change-over procedure of mode
Please switch to each mode one by one by《Mode》key operation as shown in the Fig.4-(2). Holding down 《Mode》
key for two seconds or longer enters the setting mode.
It automatically returns to the pressure display mode when there is no key input even if 15 seconds or more passfrom the last key input. However, it excludes 《Up》《Down》key input waiting state of setting mode.
Even if the power supply is intercepted, a set value of each mode is maintained excluding the max. and the min.
value memory, and the test mode.
Please refer to P.12 “Mode table“ for the factory default setting.

10

Fig.4-(2) Change-over of mode (Please refer to P.10 “3．How to operate“ for a basic operation in each mode.)

Max. and min. value display

Zero adjustment

Setting value
protecting

Setting mode
Sets the address in MODBUS communication.

Every
one
second01 to FE(hexadecimal)

Memory reset
Setting / release
alternate operates

Selects the communication speed
in digital communication.
9.6kbpsEveryone
second

19.2kbps

Memory reset

Selects the display filter.
0.2 seconds
1.0 second
2.0 seconds＋

Display mode of
the pressure value

Continuouspressing

4.0 seconds＋

Continuouspressing

Selects the output filter.
0.2 seconds
1.0 second

2.0 seconds

Normal display
Upper limit over range display
Single pressure range：+ 110 % FS or more
Zero point center range：+ 60 % FS or more
Lower limit over range display
Single pressure Range：- 10 % FS or less
Zero point center range：- 60 % FS or less

It automatically returns to
the display mode of thepressure value when a key is
not pressed for 15 seconds.
(exclude it at the time of ▲and ▼ key input waiting of
the setting mode.)

Continuouspressing

4.0 seconds

Sets the indication low cut value.
0 to 5%FS(in units of 1%FS)

Continuouspressing

Sets the sign inversion for measurement
indication value.
Symbol inversion
NormalSets the sign inversion for digital output value.

Explanation of markSymbol inversion：《Mode》key is pushed

Normal：《Up》 key is pushed：《Down》 key is pushed

Sets the power consumption mode.

：《Enter》 key is pushed
Continuous ： Continuous pressing forpressing two seconds or more

Low power consumption mode
Normal power modeEnters the test mode, and sets a simulatedpressure value.
Pressure setting range：
Single pressure range： -10 to +110%FS
Zero point center range：-60 to +60%FS
Unit：Pa, kPa

This function reverts the setting value
to the factory default.
Does not clear the setting value.
Clears the setting value.

11Mode table
Mode typePressure
display

Mode nameModedisplay

Factory default setting
Setting range

Display

Set value

Unit

Normal――Pa / kPa―

Upper limit over range

―

―

―

―

Lower limit over range

―

―

―

―

Zero adjustment―

No zero corrections――

Protecting release―

UnL / LoC

Seting value protecting

―

Quick
Max. value display――

Pa / kPa―

Min. value display――

Pa / kPa―MODBUS slave address

01―

01～FE（hexadecimal）

Communication speed

9.6kbpsbps

9.6k / 19.2k

Display

Response time 1.0 seconds

seconds

OutputResponse time 1.0 seconds

seconds

Display low cut

±2%FS

±%FS

0～5%FS (every 1%FS)

Sign reversal of
display measuredOff―on / oFF

Sign reversal of
Digital communication output

Off―on / oFF

Low power consumptionOff―on / oFF―

Mono: -10～+110%FS± ： -60～+60%FS――

FilterSetting

0.2sec/1sec/2sec/4sec

Test mode――

Setting clear mode

（factory default setting）*All setting values are set to the factory default setting in the setting clear mode.

123-2 Basic operation in each mode
Please refer to P.11 “Fig.4-(2) Change-over of mode“ for the order of shifting each mode etc. As for the following
items, it is executable from the pressure display mode according to a quick operation. All basic operations of othereach program mode are united as shown in Fig.4- (3).
Quick operation▲ ＋ ▼ ＋ LP
MODE ＋ ▼ ＋ LP

Zero adjustment
Setting value protecting
Max. value display
Min. value display
Ｌ ：Continuous pressing for two seconds or more▲▼

Fig.4-(3） Common setting operations
One pushing《Up》or《Down》key changes
figure one by one and continuous pushingup or down key changes figure continuously.

A target setting value is displayedby operating《Up》or《Down》key.

Set completion（It is registered in memory）

Next setting item

＜Operation example＞
Set completion

Low power consumption mode
Normal power mode

Explanation of mark
Next setting item

：

Mode

key is pushed： Up key is pushed：

Down

key is pushed

：

Enter

key is pushed1）Registration of set value
It moves from the pressure display mode to each mode one by one by《Mode》key operation. When《Enter》key ispressed with becoming the display of a target mode, present value is displayed, and state moves in the state ofvalue input. Next, after the display value is adjusted to a target set value by operating《Up》《Down》key, 《Enter》
key is pushed. Then, the display blinks twice and registration to the memory is completed. It is not registered
until《Enter》key is pushed even if setting display value is changed.
2）Operation of set value
When a set value is changed in each mode, a set value grows if《Up》key is pushed, and if《Down》key is pushed, a
set value becomes small. It becomes a lower bound if《Up》key is pushed when the indicated value is an upper
limit, and if《Down》key is pushed at the lower bound, it becomes an upper limit. The value increases anddecreases continuously when press and hold a key (key repeat operation). The range which can be set is different
depending on each mode.
3）Error and command protecting when setting is operated
The display becomes
and registration becomes invalid at the time of the command protecting. The
setting and release alternately change into the setting value protecting at each quick operation.
( MODE ＋ ▼ ＋LP)

134）Clearing of the Max. and Min. value
It becomes the following with 《Enter》 key in the following mode.
Max. value display mode
: The max.value is reset.
Min. value display mode
: The min.value is reset.
5）Set value clear mode : A set each value is returned to the state of the factory shipment.
When ”YES” is selected in set value clear mode and《Enter》key is pressed, all set values are restored in thestate of factory shipment. When ”no” is selected, clearness is not executed. Default is ”no” so as not to clear
by mistake.
3-3 Operation of test mode
The measurement pressure value immediately before is set as simulative pressure value immediately after the shiftof the test mode. And, the state becomes a test mode at once. Even if《Enter》key is not pressed, the increase anddecrease of value with《Up》《Down》key becomes effective at once.
3-4 Calibration for zero adjustment
To set the current pressure indication value to 0% FS, adjust the offset between the indicated value and the digitalcommunication output value.
As the zero adjustment processes internal data whose accuracy is higher than the indicated pressure, this function
works even when the pressure indication is “0.”[Operation procedure]
1）Leaving pressure tubes open to atmospheric air on the H side as well as L side, let this unit have no pressure
applied.
2）In accordance with P.10 “3-1 Change-over procedure of mode“,return to the pressure display mode.
3）Press《Up》key and《Down》key at the same time for two seconds or more. The display informs of zero adjustmentcompletion by the display's becoming ”000” and blinking twice.
4）Reconnect tubes back to normal and this puts an end to operation.
Note)
When the pressure display value shifts by ±20% or more to the factory shipment, zero adjustment can not to be
done. At this time, the display shows.

△！

Caution・Before conducting zero adjustment, perform a warm-up operation for 15 minutes or longer after turning
on of the power supply.
・Be sure to conduct zero adjustment with the product in a correct installation orientation by surely
avoiding application of pressure to both the H and L side bases (open to atmosphere) or stopping themachine operation and reducing the residual pressure to zero.
・After zero adjustment has completed, be sure to put the pipes back.

14

4．MODBUS communication
4-1 Communication specifications
Communication method
EIA-485（RS-485）
ProtocolMODBUS/RTU
Communication speed
9.6kbps ,19.2kbps
Data length
8 bits (fixed)
ParityNone (fixed)
Stop bit
1 bit (fixed)
Address setting range
1 to 254 (01 to FE)

4-2 Communication setting
Set the slave address and communication speed in accordance with P.11 “Fig.4-(2) Change-over of mode“.
*The factory default settings are “slave address: 01” and “communication speed: 9.6 kbps.”

4-3 Structure of message frame
The message frame of MODBUS/RTU is as follows.

Start

Slave address

Function code

Data

CRC

End

Non-communication
time(For 3.5 characters)

1 byte1 byten bytes

2 bytesNon-communication
time(For 3.5 characters)

When “FF” is set to the slave address, broadcast communication is enabled, and writing is performed in all pieces ofthis sensor on the same bus.
*Function codes 05 and 16 only.

4-4 Message examples
F

0 :

q

“

”

address 01.

Query
01 03 00 04 00 01 C5 CB
Start

Slave
address

Function
code

-

01

03

△
！

CautionStart address
0004・Items cannot be continuously read.
・Except in q
“M
”
q
“M
”

Response *wh
01 03 02 00 06 38 46

d

Start

Slave
address

Function
code

-

01

03

Data
Number of registers
00

”
”

01

CRC
C5

“

,”

“

,”

End
CB

“00 0 ”

“00 02”

“

“ ”

Data
Numberof bytes
02

CRC

Description
00

15

06

38

End

46

-

-

“

F

04:

q

“

”

0

Query
01 04 00 00 00 01 31 CA
Start

Slave
address

Function
code

-

01

04

△
！

CautionStart address
00

00

00

01

CRC
31

End
CA

-

Items cannot be continuously read. Set “00 01” to “Number of registers.”

Response *wh
01 04 02 00 64 B8 DB

“

Start

Slave
address

Function
code

-

01

04

05: Ex“Z

F

Data
Number of registers”

Data
Numberof bytes
02

j

CRC

Acquired data
00

64

”

B8

End

DB

-

0

Query
01 05 00 00 00 01 0C 0A
Start

Slave
address

Function
code

-

01

05

Data
Start address

Changed data

00

00

00

01

CRC
0C

End
0A

-

*When “FF” is set to the slave address, broadcast communication is enabled.

Response
01 05 00 00 00 01 0C 0A
Start

Slave
address

Function
code

-

01

05

Data
Start address

Changed data

00

00

00

*In broadcast communication, there is no response.

16

01

CRC
0C

End
0A

-

F

0x 0 : E

“L

”

0

Query
01 10 00 00 00 01 02 00 01 67 90

Start

Slave
address

Function
code

-

01

10

Start address
00

00

Data
Number ofregisters
00

Numberof bytes

01

CRC

Changed data

02

00

01

67

End

90

*When “FF” is set to the slave address, broadcast communication is enabled.

△！

Caution・Items cannot be continuously written.
・Ex“,”“00 0 ”
y”“,”“00 02” “
y
”

“

”
”

“04”

Response
01 10 00 00 00 01 01 C9

Start

Slave
address

Function
code

-

01

10

Data
Start address

Number ofregisters

00

00

00

*In broadcast communication, there is no response.

17

01

CRC

01

End

C9

-

“02”
“

“

-

4-5 MODBUS address map
The details of addresses are as shown in the table below.
MODBUS address map
Read
/
Write

Functioncode

Address

Data
type

Data
size

Item

R

04

0

Signedinteger

2 bytes

Pressure value

R

04

1

Signedinteger

2 bytes

Pressure ratio

R

04

2

R

04

3

R

04

4

R

04

5

Unsigned
integer

2 bytesW

05

0

Boolean

1 bit

W

05

1

Boolean

1 bit

W

05

2

Boolean

1 bit

W

05

3

BooleanW

05

4

Boolean

W

05

100

BooleanSignedinteger
Signedinteger
Unsigned
integer

Initialvalue

Same as pressure range indicationEx: − 0000--> − 00
1100)
* The decimal point in the indicated value is omitted.

--

Mono : − 000 to 11000 − 0±: − 000 to 6000 − 0--Maximum pressurization
value
Minimum pressurization
value
Communication error
history

0% F
0% F

“

”

-

-

“

”

-

-

Refer to ”4-7 List of communication error history ”

P.19

00

Status history

Refer to ”4-6 Status history list ”

P.19

00

Zero adjustment

1: Execute zero adjustment.

P.14

0

1: Clear maximum value/minimum value.

P.5

0

1: Clear maximum value.

P.5

0

1 bit

Clearing of minimum value 1: Clear minimum value.

P.5

0

1 bit

Clearing of error

1: Clear information on error that has occurred.

-

0

1 bit

Restart

1: Restart the device.

-

0

1 bit

Factory default setting

1: Reset the setting values in each mode to the factory
default setting values.
* Setting of slave address is also reset.

P.12

0

1 byteLow power consumption
mode

0: disable

1: enable

P.5

0

1 byteSetting value protection

0: disable

1: enable

P.6

0

4 bytes

Manufacturing number

-

-

-

-

2 bytes
2 bytes

Clearing of maximum
value/minimum value
Clearing of maximum
value

W

05

200

R/W

03 / 160R/W

03 / 16

1

R

03

2

R

03

4

Unsigned
integer

1 bytePressure range code

06: D50
12: D300
21: D+-50
24: D+-300

R/W

03 / 16

5

Unsigned
integer

1 byteDisplay low cut

0 to 5 (0 to 5%)

P.4

02

R/W

03 / 167

1 byteFunction of sign reversalof display measured

0: disable

1: enable

P.4

0

R/W

03 / 168

1 byteDisplay filter

0: 200 ms

1: 1000 ms

2: 2000 ms

3: 4000 ms

P.4

1

R/W

03 / 1610

1 byteOutput filter

0: 200 ms

1: 1000 ms

2: 2000 ms

3: 4000 ms

P.5

1

1 byteFunction of sign reversalof digital communication
output0: disable

1: enable

P.5

0

4 bytes

Slave address

1 to 254 (01 to FE)-

01

1 byteCommunication speed

03: 9.6 kbps 05: 19.2 kbps

-

03

R/W

03 / 16

11

R/W

03 / 16

13

R/W

03 / 16

15△！

CautionBoolean

2 bytes

Reference

Effective data range

Unsigned
integer
Unsigned
integer
Unsigned
integer

Unsigned
integer
Unsigned
integer
Unsigned
integer
Unsigned
integer
Unsigned
integer
Unsigned
integer

08: D100
13: D500
22: D+-100
25: D+-500

11: D200
16: D1000
23: D+-200

・“Continuous reading” and “continuous writing” of items are impossible.
・Do not perform writing to other than writable address. Failure to follow this instruction may cause a failure.

18

4-6 Status history list
The presence/absence of status abnormality is indicated by the lower 6 bits.
Upper
15

Bit

14

13

12

Lower

11

10

9

8

7

6

5

4

3

2

1

0

Reserved

Bit

Item

Description0

Overflow1

Underflow

2

MODBUS error

3

EEPROM
rewriting limit error

4

EEPROMwriting error

5

Zero adjustment
error

6

0: normal 1: occurrence of overflow
W,“ ”
0: normal 1: occurrence of underflow
W,“ ”
0: normal 1: occurrence of communication error
When an error related to MODBUS communication has,“ ”
0: normal 1: EEPROM has reached the rewrite limit
When the number of rewritings of internal EEPROM has
00,000,“ ”
0: normal 1: occurrence of EEPROM writing error
When writing is disabled due to breakage of EEPROM, noise,,“ ”
0: normal 1: failure of zero adjustment
W
z
j
,
“ ”
*The pressure indication value at the time of implementationof zero adjustment may be deviated from the factory default
y ±20%zj
procedures, and then implement zero adjustment again. 3-4
Calibration for zero adjustment”
14

15

Reserved*An error from which the device has already been restored will be cleared after reading is performed once.

4-7 List of communication error history
The presence/absence of communication error is indicated by the lower 3 bits.
Upper
Bit

15

14

13

12

11

Lower
10

9

8

7

6

5

4

3

2

1

0

Reserved

Bit

Item

0

Invalidcommand1

Invalid address2

Invalid data

Description
0: normal 1: reception of invalid function code
When a request for unsupported function code is received, this bit“ ”
0: normal 1: reception of invalid address
When a request for unsupported address is received, this bit turns“ ”
0: normal 1: reception of invalid data
When a request for writing of value out of the effective range is,“ ”

3 to 15

Reserved*An error from which the device has already been restored will be cleared after reading is performed once.

19

Ⅴ．INFORMATION ON SOFTWARE
In part of this sensor, the following OSS (open-source software) is used.

The product use FreeRTOS. More detail read below.

* FreeRTOS Kernel V10.0.1* Copyright (C) 2017 Amazon.com, Inc. or its affiliates.

All Rights Reserved.

** Permission is hereby granted, free of charge, to any person obtaining a copy of* this software and associated documentation files (the "Software"), to deal in* the Software without restriction, including without limitation the rights to* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of* the Software, and to permit persons to whom the Software is furnished to do so,* subject to the following conditions:** The above copyright notice and this permission notice shall be included in all* copies or substantial portions of the Software.
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
** http://www.FreeRTOS.org* http://aws.amazon.com/freertos

20

Ⅵ．PRODUCT WARRANTY
Warranty Period
The warranty period shall be for one year from the date that the product has been delivered to the location specified by thepurchaser.
Warranty Scope
In the event of any failure or defect in the product or non-conformity of specifications due to the reasons solely attributable to
Yamamoto Electric Works, Yamamoto Electric Works shall remedy such malfunctioning or defective product at its own cost in oneof the following ways to be selected by Yamamoto Electric Works:ⅰ) repair such product, ⅱ) replace such product.
However, this Warranty shall not cover the damages or defects that arise due to any of the following reasons.
(1) Any failure resulting from improper conditions, improper environments, improper handling, or improper usage other thandescribed in the instruction manual or the specifications arranged between the purchaser and Yamamoto Electric Works.
(2) Any failure resulting from factors other than a defect of our product, such as the purchaser’s equipment or the design ofthe purchaser’s software.
(3) Any failure resulting from modifications or repairs carried out by any person other than Yamamoto Electric Works’ staff.
(4) Any failure caused by a factor that cannot be foreseen at a scientific/technical level at the time when the product has been
shipped from Yamamoto Electric Works.
(5) Any disaster such as fire, earthquake, and flood, or any other external factor, such as abnormal voltage, for which we are
not liable.
Yamamoto Electric Works specifically disclaims all implied warranties of merchantability and/or fitness for a particular use or
purpose, as well as liability for incidental, special, indirect, consequential or other damages relating to the product.
*This product warranty is only valid within Japan.
Product Applicability
Our products are designed and manufactured as general-purpose products for general industries. Therefore, our products are notintended for the applications below and are not applicable to them.
(1) Facilities where the product may greatly affect human life or property, such as nuclear power plants, aviation, railroads,
ships, motor vehicles, or medical equipment(2) Public utilities such as electricity, gas, or water services(3) Usage outdoors, under similar conditions or in similar environments
This document has been translated from the original Japanese version, and the original Japanese version takes first priority.
Be sure to refer to the original Japanese for the details of this warranty.

<Prior notice>
The specifications and description of the product explained in this instruction manual may be subject to change without priornotice because of modification and the like.

21