KYOWA WGA-680A Series User manual

IM-A-1060G January 2019
INSTRUCTION MANUAL
WGA-680A
INSTRUMENTATION AMPLIFIER
(FOR BCD/RS-232C/RS-485/TEDS OPTIONS)
AC model
WGA-680A-01: BCD/TEDS
WGA-680A-02: RS-232C/TEDS
WGA-680A-03: RS-485/TEDS
DC model
WGA-680A-11: BCD/TEDS
WGA-680A-12: RS-232C/TEDS
WGA-680A-13: RS-485/TEDS
Thank you for purchasing KYOWA’s product WGA-680A Instrumentation
Amplifier.
Read this Instruction Manual carefully in order to make full use of the high
performance capabilities of the product.
Do not use the product in methods other than described in this Manual.
Generally, company names and trade names described in this Instruction Manual are trademarks or registered
trademarks of the companies.
This Instruction Manual may not be copied or reproduced, in whole or part, without consent of KYOWA.
Copyright © Kyowa Electronic Instruments Co., Ltd. All rights reserved.
The contents of the Instruction Manual are subjected to change without prior notice.
We assume no responsibility whatever for any damage resulting from the use of this product.

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CONTENTS
STANDARD ACCESSORIES ············································································································ 3
OPTIONAL ACCESSORIES ············································································································· 3
SAFETY PRECAUTIONS (Do not forget to read the safety precautions prior to use.）········································ 4
LIMITED LIFE PARTS AND PREVENTIVE MAINTENANCE··································································· 6
WGA-680A REPLACEMENT BEFORE THE END OF SERVICE LIFE ························································· 6
NOTATIONS USED IN THE INSTRUCTION MANUAL ·········································································· 6
PRECAUTIONS ON CE MARKING ··································································································· 7
1. BCD OUTPUT ··························································································································· 8
1-1. OUTLINE OF PRODUCT ········································································································ 8
1-2. CONTROLS AND INDICATORS (REAR PANEL)·········································································· 8
1-3. BCD OUTPUT SPECIFICATIONS ····························································································· 8
1-4. PIN AND SIGNAL················································································································· 9
1-5. TO CONNECT BCD OUTPUT ·································································································· 9
1-6. TO CONNECT BCD CONTROL INPUT ······················································································ 9
1-7. TO SET BCD OUTPUT ··········································································································10
1-8. BCD SIGNAL TIMING ··········································································································10
2. RS-232C/RS-485························································································································12
2-1. RS-232C OPTIONS···············································································································12
2-1-1. OUTLINE OF PRODUCT··································································································12
2-1-2. CONTROLS AND INDICATORS (REAR PANEL) ···································································12
2-1-3. RS-232C SPECIFICATIONS ······························································································12
2-1-4. PIN AND SIGNAL ··········································································································13
2-1-5. TO CONNECT EXTERNAL DEVICES ·················································································13
2-2. RS-485 OPTIONS·················································································································14
2-2-1. OUTLINE OF PRODUCT··································································································14
2-2-2. CONTROLS AND INDICATORS (REAR PANEL) ···································································14
2-2-3. RS-485 SPECIFICATIONS ································································································14
2-2-4. PIN AND SIGNAL ··········································································································14
2-2-5. TO CONNECT EXTERNAL DEVICES ·················································································15
2-3. TO SET RS-232C AND RS-485 ································································································16
2-4. COMMUNICATION PROCEDURES ·························································································17
2-5. OUTLINE OF CONTROL COMMANDS ····················································································18
2-6. LIST OF CONTROL COMMANDS ···························································································19
2-7. DETAILS OF CONTROL COMMANDS ·····················································································20
2-7-1. Initial settings·················································································································20
2-7-2. Reading ························································································································22
2-7-3. Executing······················································································································24
2-7-4. Settings ························································································································25
2-7-5. Others ··························································································································32
2-7-6. Binary code (RS-485 only) ·································································································32
3. TEDS FUNCTION······················································································································33
3-1. OUTLINE OF PRODUCT ·······································································································33
3-2. TEDS SPECIFICATION ·········································································································33
3-3. TO CONNECT·····················································································································33
3-4. TO OPERATE······················································································································33
3-4-1. Sensitivity registration by power switch ··················································································33
3-4-2. Sensitivity registration by key operations ················································································33
3-4-3. Sensitivity registration by command operations·········································································34
3-5. TEDS DATA SENSITIVITY REGISTRATION ··············································································34

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3-6. TO SET TEDS ····················································································································· 35
4. TROUBLE SHOOTING··············································································································· 36
5. OUTSIDE DRAWING················································································································· 37
5-1.WGA-680A-01: BCD/TEDS OPTION ························································································· 37
5-2.WGA-680A-02: RS-232C/TEDS OPTION ···················································································· 38
5-3.WGA-680A-03: RS-485/TEDS OPTION ······················································································ 39
5-4.WGA-680A-11: BCD/TEDS OPTION ························································································· 40
5-5.WGA-680A-12: RS-232C/TEDS OPTION ···················································································· 41
5-6.WGA-680A-13: RS-485/TEDS OPTION ······················································································ 42

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STANDARD ACCESSORIES
The following accessories are packed with the WGA-680A-01, WGA-680A-02, WGA-680A-03, WGA-680A-11,
WGA-680A-12, and WGA-680A-13.
When unpacking, check the contents to ensure that all accessories are enclosed.
Instruction Manual 1 (CD-R)
(For WGA-680A, For BCD/RS-232C/RS-485/TEDS, For CC-Link)
Product Warranty 1 each
Unit label 1
Flat-head screw driver for control input/output terminal blocks 1
OPTIONAL ACCESSORIES
<BCD output connector>
Soldered plug (3M Japan Limited) 10136-3000PE
Shell kit (3M Japan Limited) 10336-52F0-008

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SAFETY PRECAUTIONS (Do not forget to read the safety precautions prior to use.）
The WGA-680A-01, WGA-680A-02, WGA-680A-03, WGA-680A-11, WGA-680A-12 and WGA-680A-13 are
designed to be used according to "1-3. BCD OUTPUT SPECIFICATIONS", "2-1-3. RS-232C specifications", and "2-
2-3. RS-485 specifications". Do not use the product in an environment exceeding the specifications.
Or, it may cause troubles.
PRIOR TO USE
For safe use of the product, do not forget to read the “Safety Precautions” prior to use.
Kyowa Electronic Instruments Co., Ltd. assumes no liability for any damage resulting from the user's failure to comply
with the safety precautions.
For safety operation of the product, the following symbol marks are used in the Instruction Manual.
Indicates “PROTECTIVE GROUND TERMINAL.”
Be sure to connect the GND terminal to the ground.
SAFETY SYMBOLS
For safety operation of the product, the following symbol marks are used in the Instruction Manual.
WARNING Improper operation of the system may result in death or severe injury of the operator.
CAUTION Improper operation of the system may result in injury of the operator and physical
damage of the system.
WARNING
● Warning.
Be sure to observe the safety precautions described in the WGA-680A Instruction Manual.
●To prevent a fire hazard, ensure that the power supply voltage specified for the product matches the local line
voltage before connecting the system to the power outlet.
Power supply specs
WGA-680A-00~04 (AC models) :AC100~240V, Power consumption: 20VA or less
WGA-680A-10~14 (DC models) :DC10~30V, Power consumption: 10W or less
● Avoid using in environment with inflammable gas, etc.
To prevent the risk of fire hazard or explosion, do not use the product in environment with inflammable gas, vapor,
or dust.
● If any trouble occurs.
To prevent a fire hazards, if smoke is emerging from the product, immediately disconnect the USB cable or AC
adapter to terminate the system operation.
● Protective ground.
Be sure to connect the GND terminal to the ground. Or, it may cause an electric shock hazard, lower the
performance, and cause trouble.

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CAUTION
● Caution
Be sure to observe the safety precautions described in the WGA-680A Instruction Manual.
● Do not use the product outdoors.
Or, it may cause electric shock, fire hazard, lower the performance and cause troubles.
● Do not turn ON the power switch immediately after turning it OFF.
After turning OFF the power switch, wait (5 seconds) until the power supply is shut OFF before turning ON the power
switch again.
If the power is repeatedly turned ON and OFF within 5 seconds, rush current generated by switching the power ON
may damage the product.
● Use the product within temperature ranging from -10 to +50℃.
Use at temperatures exceeding the specified range may lower the performance and cause trouble.
If use under direct sunlight or in a cold place is inevitable, prepare a sunscreen or take proper measures to keep it warm.
● Use the product in the specified operating humidity of 20 to 80% RH.
Use in a humid place exceeding the specified range or where it is exposed to splashing water may lower the
performance and cause trouble.
● Do not use the product immediately after the change in the environment.
Leave the product as it is until it becomes adaptable to the environment.
Abrupt change in ambient temperature due to transportation, etc. may cause dew condensation, which may result in
lower performance and troubles.
● Use the product under environment without excessive vibration or high impact.
Vibration resistance: 19.6m/s2(2G), 10 to 200Hz (when in operation)
Use the product in an area where vibration and impact can be kept within the scope of specifications.
Continuous vibration or severe impact may cause deteriorated performance and system failure.
● Do not use the product in strong electromagnetic field.
Use the product in a magnetic field environment where the PC may be used.
Performance may be lowered and erroneous operation and troubles may result if it is used near a telemetry system,
microwave oven, electronic furnace or any other equipment generating a strong magnetic field.
● Do not use the product under poor conditions.
Operate the product within the range of power supply specs. The power supply used for the product should not
experience an instantaneous power failure and be free from noise.
● Do not pull cords and cables.
Lay cords and cables with a certain allowance so that unreasonable force is not applied to the connections.
Or, it may interrupt the measurements, break the cables, and damage the connectors.
● Avoid installing sensors and products near a welding machine. Failure to do so will pose the risk of erroneous data,
malfunction and failure.
● Do not disassemble or remodel the product. Or, it may cause electric shock hazards or damage the product. This
warranty does not cover any damaged or defective parts that results from disassembling or remodeling.
● This can lead to performance problems and decreased operating efficiency. Be careful that dust may not enter the product
not only during operation but also under stored conditions.
● Do not use or strage the product under dusty or fine particles or corrosive gas environment.
Use or strage under these environment, may result in lower performance and troubles.
● Do not expose the product to the air if it is used and stored nearby sea. Air exposure nearby sea may cause lower
performance and products failure.
● Take care when handling the CD-R.
Do not expose the CD-R to direct sun light, high temperature, or high humidity.
Do not apply pressure to the CD-R by laying object or bending.
Dust, scratches, and fingerprints on either side of the CD-R can cause write errors.
● Preheat the product before use.
After the power ON, always preheat the product for approximately 1 hour.
● Cleaning.
When the product gets dirty, clean the product with a dry soft cloth. When dust exists inside the WGA-680A, clean it by
using an air blow gun. Do not touch electronic parts.

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LIMITED LIFE PARTS AND PREVENTIVE MAINTENANCE
The WGA-680A-01, WGA-680A-02, WGA-680A-03, WGA-680A-11, WGA-680A-12 and WGA-680A-13 consist of
various electronic components and those components, if not all, have a useful life.
Using them exceeding the years specified according to each part type (useful life) may affect the characteristics of the
product, resulting in a malfunction or a failure.
Particularly, when aluminum electrolytic capacitor life ends, the signal-noise ratio lowers due to capacity low or smoke
is emitted due to liquid leak, resulting in a malfunction of the product.
To operate the product normally, finding a sign of the product failure early by daily/periodic inspections and taking the
corrective action are required.
For inspection, contact KYOWA or our representatives.
* Limited life parts used with the product are aluminum electrolytic capacitor.
* All components do age and will fail.
WGA-680A REPLACEMENT BEFORE THE END OF SERVICE LIFE
Preventive maintenance and replacement parts are a cost-effective way of keeping the performance and extending the
service life of the product. Regardless of the replacement parts, the product itself gradually deteriorates with age.
Before the expected service life is reached, consider replacing the product with a new one or the latest series as
preventive maintenance.
NOTATIONS USED IN THE INSTRUCTION MANUAL
The following notations are used in the Instruction Manual for convenience.
● Names described on the panel surface
Names described on the panel surface are expressed in double quotation mark " ".
● Informational notes
Certain notations are used as necessary to attract your attention to information that requires special care when
handing the product, and to information provided for reference purposes.
Examples of Notations
Essential precautions required when handling the product.
NOTE
Reference items required when handling the product.
MEMO

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When satisfying the following conditions, we evaluated the compatibility against the requirements of the EU
Directives and confirmed that the product satisfied the requirements.
● To connect products, be sure to use the shielded BCD output cables, shielded RS-232C cables and shielded
RS-485 cables.Wiring should be 30 m or less.
● Before connecting the following cables, be sure to mount ferrite core near the terminal or connector.
・Control cable
Recommended ferrite core GRFC-5 (KITAGAWA INDUSTRIES CO., LTD.)
・BCD cable
Recommended ferrite core E04SR200932 (SEIWA ELECTRIC MFG. CO., LTD.)
● Be sure to mount the product on the control panel, etc. Before turning ON the power, make sure the product is
covered to avoid contact with hands.
● The product connection should be executed by experts in electrical work.
● To immediately turn OFF the product, place switches or circuit breakers inside the building and near the product
and display the functions as well.
Use switches and circuit breakers conforming to the IEC60947-1 and IEC60947-3.
● Use the product in area where elevation is 2000 m or below.
● When mounting the product in your system, approaches to satisfy the CE marking requirements vary with the
configuration of the control panel to be used, the other devices to be connected, and wirings. Therefore,
customers are required to check whether the CE marking requirements on the product are satisfied or not.
● Be sure to connect the GND terminal to the ground by using the optional ground wire.
PRECAUTIONS ON CE MARKING
NOTE

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1. BCD OUTPUT
1-1. OUTLINE OF PRODUCT
The WGA-680A-01(AC model) and WGA-680A-11(DC model) are an instrumentation amplifier with the BCD/TEDS
options. These products are able to retrieve the indicated values as the BCD data.
The product is able to control the PLC (sequencer), and be able to print data by using printers.
1-2. CONTROLS AND INDICATORS (REAR PANEL)
*Figure is AC model.
(1) [BCD DATA
OUTPUT] connector
Retrieves the indicated values as the BCD data.
Controlled by using various input signals and output signals.
(2) [TEDS] terminal block For details, see "3. TEDS FUNCTION".
1-3. BCD OUTPUT SPECIFICATIONS
SPECIFICATIONS Initial values
Output
Data: 20 bits (4 bits × 5-digit)
Negative sign, OVER, EOC (End of Conversion),
Outputs data during the holding interval and detecting interval.
Output format open collector output: 30 VDC, max. 20mA
Input
Number of points 2 (DATA HOLDING signals and
OUTPUT-prohibited signals)
Input format Dry contact signal or open collector signal
(12 VDC voltage and 5 mA current can be applied.)
The number of
outputs Approximately 15.6 times/s, 31.3times/s, 62.5times/s, and 125times/s Approximately 125 times/sec
Output logic
Data logic Positive logic, negative logic Negative logic
EOC logic Positive logic, negative logic Negative logic
Polarity logic Positive logic, negative logic Negative logic
(1)
(2)

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1-4. PIN AND SIGNAL
Pin No. Signal name Pin No. Signal name
1 Data 1 Output 19 Data 2 Output
2 Data 4 Output 20 Data 8 Output
3 Data 10 Output 21 Data 20 Output
4 Data 40 Output 22 Data 80 Output
5 Data 100 Output 23 Data 200 Output
6 Data 400 Output 24 Data 800 Output
7 Data 1000 Output 25 Data 2000 Output
8 Data 4000 Output 26 Data 8000 Output
9 Data 10000 Output 27 Data 20000 Output
10 Data 40000 Output 28 Data 80000 Output
11 POL (negative polarity) Output 29 OVER Output
12 EOC output Output 30 Holding interval (*1) Output
13 Detecting interval (*1) Output 31 NC (Connection prohibited)
14 NC (Connection prohibited) 32 NC (Connection prohibited)
15 NC (Connection prohibited) 33 NC (Connection prohibited)
16 NC (Connection prohibited) 34 NC (Connection prohibited)
17 BCD DATA HOLDING signals Input 35 BCD OUTPUT-prohibited signals Input
18 COM 36 COM
(*1) Outputs data during the holding interval: While holding the indicated values. Open collector output L (ON)
Outputs data during the detecting interval: While detecting the peak values, etc. Open collector output L (ON)
To connect external devices, the applicable connector of the cables is as follows.
Connector Model: 10136-3000PE (3M Japan Limited)
Cover Model: 10336-52F0-008 (3M Japan Limited)
1-5. TO CONNECT BCD OUTPUT
To connect external devices, connect the following signals as described in
the right figure.
Data: 1 to 80000
POL, OVER, EOC, Holding interval and detecting interval
The control outputs are open collector, 30 VDC, 20 mA max.
1-6. TO CONNECT BCD CONTROL INPUT
To connect external switches or open collectors, connect
the following signals as described in the right figure.
BCD DATA HOLDING signals,
BCD OUTPUT-prohibited signals

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1-7. TO SET BCD OUTPUT
For details of functions, see "4" in the INSTRUCTION MANUAL.
To set the data output logic, polarity logic (negative polarity), and EOC logic, go to the FUNCTION SELECTING
mode [F-11].
FUNCTION
SELECTING mode
Key operation and WGA-680A-0*
movement in SETTING mode Functional description
F-11
BCD Output
Logic
Display the following items (1), (2), (3), (4)
(1) The number of outputs
0: 125 times/sec. (initial value)
1: 62.5 times/sec.
2: 31.3 times/sec.
3: 15.6 times/sec.
(2) Data Output Logic
0: Negative logic (initial value)
1: Positive logic
(3) EOC logic
0: Negative logic (initial value)
1: Positive logic
(4) Polarity logic
0: Negative logic (initial value)
1: Positive logic
Select and change values in items (1), (2), (3) and (4) and
press the SET key.
A function that sets the output
logic and output rate of the
BCD data.
Open collector transistor
output
Negative logic:
When the Signal is ON, the
transistor output is ON.
1-8. BCD SIGNAL TIMING
To read the BCD data, POL (negative polarity) data, and OVER data by using the EOC data (negative logic) , read the
data within 1/2 (msec) from the falling edge ("H " → "L").
To read data after holding the BCD data, make sure the BCD Hold input signal is "L (ON)." Then read the data 5 msec
or later. The BCD data does not vary when the BCD Hold input signal is "L (ON)."
Delay time
Delay time between input and BCD output = (Delay time between input and D/A output) + (BCD conversion time)
Delay time between input and D/A output: Max. 12msec
BCD conversion time: Max. 4 msec (The number of outputs: 125 times/sec)
(1) (2) (3) (4)

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(1) OVER signals
Outputs the OVER signals when the value exceeds the input range or display range. (The OFL1, OFL2, OFL3, or
OFL4 appears.)
When the input range is over, the value immediately before over detection is output.
It outputs 99999 in case of display + over, and -99999 in case of display - over.
(2) POL (negative polarity) signals
Output the POL signal when the indicated value is negative (-).
(3) BCD OUTPUT-prohibited signals
When the OUTPUT-prohibited signal is "L (ON)", the transistor outputs are all OFF.
To connect multiple BCD outputs or to select the target channels, use the BCD OUTPUT-prohibited signals.
T1: Data output and EOC signal output time
The number of outputs (times/sec) T1 (msec)
125 8
62.5 16
31.3 32
15.6 64
T2, T3: 1 msec (min)
Relationship between the EOC signals and BCD Data Hold signals.
Read the BCD Data Hold signals when the EOC signal is turned ON.
When the BCD Data Hold signal is ON, the product does not output data and does not output EOC signals.
T4, T5: 1 msec (min)
Relationship between the EOC signals and Output-prohibited signals.
Reads the Output-prohibited signals when the EOC signal is turned ON.
When the Output-prohibited signal is "L (ON)", the data transistor outputs are all OFF. The product does not
output EOC signals.

IM-A-1060G
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The WGA-680A-02 does not support the XON/XOFF and send brake signals.
2. RS-232C/RS-485
2-1. RS-232C OPTIONS
2-1-1. OUTLINE OF PRODUCT
The WGA-680A-02(AC model) and WGA-680A-12(DC model) are instrumentation amplifier with the RS-
232C/TEDS options. These products are able to set various functions and read mesured values by using external
devices.
2-1-2. CONTROLS AND INDICATORS (REAR PANEL)
*Figure is AC model.
(1) [RS-232C]
connector
Sets various functions and reads mesured values by using external devices (PC, etc.).
(2) [TEDS] terminal
block
For details, see "3. TEDS FUNCTION".
2-1-3. RS-232C SPECIFICATIONS
Item Specifications Initial values
Signaling system RS-232C, full duplex system
Transmission system Asynchronous
Communication speed 2400, 4800, 9600, and 19200bps 9600bps
Bit configuration
Data bit 7
Stop bit 11
Parity: Odd number
Flow control None
Delimiter CR, CR+LF Tx: CR+LF, Rx: CR
Output code ASCII
NOTE
(1)
(2)

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● Before connecting cables, be sure to turn OFF the product and external devices.
Or, it may cause deterioration or trouble.
● The above figure is the connection example of the DTE-DTE.
The connection varies with devices.
2-1-4. PIN AND SIGNAL
Pin No. Signal name Pin No. Signal name
1 DCD 6 DSR
2 RXD 7 CTS
3 TXD 8 RTS
4 DTR 9 N.C.
5 GND
2-1-5. TO CONNECT EXTERNAL DEVICES
(1) Connection cables
To connect PCs, etc., use the commercially available crossover cable (reversible type).
Product side PC side
DCD 1 1 DCD
RXD 2 2 RXD
TXD 3 3 TXD
DTR 4 4 DTR
GND 5 5 GND
DSR 6 6 DSR
CTS 7 7 CTS
RTS 8 8 RTS
N.C. 9 9 N.C.
(2) To set external devices
Make sure the communication settings of the external device matches the "2-1-3. RS-232C SPECIFICATIONS."
NOTE
Pin type (male)
Connector front

IM-A-1060G
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2-2. RS-485 OPTIONS
2-2-1. OUTLINE OF PRODUCT
The WGA-680A-03(AC model) and WGA-680A-13(DC model) are instrumentation amplifier with the RS-
485/TEDS options. These products are able to set various functions and read mesured values by using external
devices.
These products are able to connect multiple WGA-680A-03, WGA-680A-13 units on the RS-485 network and able
to control them.
2-2-2. CONTROLS AND INDICATORS (REAR PANEL)
*Figure is AC model.
(1) [RS-485] connector Sets various functions and reads mesured values by using external devices (PC, etc.).
(2) [TEDS] terminal
block
For details, see "3. TEDS FUNCTION".
2-2-3. RS-485 SPECIFICATIONS
2-2-4. PIN AND SIGNAL
Pin No. Signal name Pin No. Signal name
1 + (non-inverting A) 6 TERMINATOR
2 + (non-inverting A) 7 N.C.
3 - (non-inverting B) 8 N.C.
4 - (non-inverting B) 9 TERMINATOR
5 SG
To connect external devices, the applicable connector (9-pin D-sub connector) of the cables is as follows.
Connector Model: XM2D-0901 (socket, OMRON Corporation or equivalent)
Cover Model: XM2S-0913 (unified screw thread, #4-40UNC, OMRON Corporation or equivalent)
Item Specifications Initial values
Signaling system RS-485, half duplex system
Communication speed 2400, 4800, 9600, and 19200 bps 9600 bps
Bit configuration:
Data bit 7
Stop bit 1
Parity: Odd number
Flow control None
Device ID 1 to 99 1
Delimiter CR, CR+LF Tx: CR+LF, Rx: CR
Output code ASCII
Pin type (male)
Connector front
(1)
(2)

IM-A-1060G
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Before connecting cables, be sure to turn OFF the product and external devices.
Or, it may cause deterioration or trouble.
2-2-5. TO CONNECT EXTERNAL DEVICES
(1) Connection cables
● To connect PCs, etc., use the RS-485 ↔ RS-232C converter, etc.
● The Pin No. 1 and pin No. 2, the pin No. 3 and pin No. 4 have the same function. Use them for transition
wirings.
● Be sure to connect a terminator in the device, located at the end of the transmission line. You are able to short-
circuit the pin No. 6 and pin No. 9 of the WGA-680A-03 instead of connecting the terminator 120 ohm.
● Make sure the RS-485 ↔ RS-232C converter switch is [DTE].
Product side Converter PC side
+ (non-inverting A) 1
+ (non-inverting A) 2 TD/RD+ RS-232C
- (non-inverting B) 3 TD/RD-
- (non-inverting B) 4 GND
SG 5
TERMINATOR 6
N.C. 7
N.C. 8
TERMINATOR 9
(2) To set external devices
Make sure the settings of the external device matches the WGA-680A-03 specifications.
The RS-485 transceiver of the WGA-680A-03 has the fail-safe function. While receiving data, the fail-safe
function makes the CPU output (RO) "1: High" when the circuit, between the pin No. 1 [+ (non-inverting A)] and
pin No. 4 [- (non-inverting B)], is short circuit or open.
While receiving data, the circuit, between the pin No. 1 [+ (non-inverting A)] and pin No. 4 [- (non-inverting B)],
are short circuit. Therefor, when the external device transceiver does not have the fail-safe function, some CPU
output (RO) is "0: Low."
To receive the data correctly, be sure to use the transceiver with the fail-safe function on the converter side.
Product side RS-485 circuit
Logic table
[Tx] [Rx]
INPUT OUTPUT INPUT A－BOUTPUT
/RE DE DI B A /RE DE RO
0 1 1 0 1 0 0 ≧300mV 1
0 1 0 1 0 0 0 ≦-300mV 0
X 0 X Hi-Z Hi-Z 0 0 OPEN 1
0 0 SHORT 1
Short circuit = With terminator
NOTE

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2-3. TO SET RS-232C AND RS-485
For details of functions, see "4" in the INSTRUCTION MANUAL.
To set the RS communication settings, go to the FUNCTION SELECTING mode [F-16] and [F-17].
You are able to use the FUNCTION SELECTING mode [F-17] (Device ID) on the RS-485 only.
FUNCTION
SELECTING mode
Key operation and WGA-680A-0*
movement in SETTING mode Functional description
F-16
RS
communication
settings
The ①,②, and ③appear at the same time on the
indicator.
(See the following figure.)
①Baud rate
0: 2400bps
1: 4800bps
2: 9600 bps (initial value)
3: 19200bps
②Receive delimiter
0: CR/LF
1: CR (initial value)
③Transmit delimiter
0: CR/LF (initial value)
1: CR
Set the value and press the SET key.
NOTE
You are able to set the transmission mode (Repeat
output, output at hold, and Tx and Rx) by using the RS
communication command.
Sets the common
communication speed for the
RS-232C and RS-485.
F-17
Device ID
Sets the device ID.
Range: 01 to 99 (Initial value: 01)
Set the value and press the SET key.
Sets the device IDs and
discriminates the products
when multiple products are
connected on the RS-485.

IM-A-1060G
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On the RS-232C, do not sent the above communication establishing command.
Or, the product replies the ng<CR><LF>.
2-4. COMMUNICATION PROCEDURES
(1) TO ESTABLISH COMMUNICATION
To establish the communication, specify the device ID since the RS-485 is able to communicate multiple units.
Enters the following command by using software, which is able to transmit binary codes.
Communication establishing command
<ENQ>01<CR>
Device ID (2 digits)
After establishing the communication, the response command
is as follows.
<ACK>01<CR><LF>
Device ID
(2)To enter commands
After establishing the communication, enter commands based on the "2-6. LIST OF CONTROL COMMANDS"
(3) To open communication
To open the communication, enter the following command.
<EOT><CR>
When you specify the other device ID without opening the
communication, the products establish communications with the new device ID.
(4) Command interval
When transmitting commands from the PC, PLC, etc., make sure the interval is longer than the following time.
(Excluding the setting commands and calibration commands.)
Command interval = Tx command time + 20 msec + Rx command time + 5 msec
Tx command time: The send character transmit time based on the pre-set baud rate.
Rx command time: The response character transmit time based on the pre-set baud rate.
Suppose the baud rate is 9600 bps (initial value). The recommended interval of the [GDT1] is 50 msec or more.
Tx commands from the PC, etc. Rx commands of the products
Tx command time 2 to 20 msec Rx command time 5 msec
(5) Delay time
Delay time between the input and RS output Max. 30 msec
No responding when the device ID does not
match.
No responding when the communication is
open in advance.
NOTE
MEMO
MEMO

IM-A-1060G
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2-5. OUTLINE OF CONTROL COMMANDS
This section describes the format, type, etc. of the control commands, output from the external devices (PC, etc.) to the
products.
To set control commands of the products, use external devices.
(1) Control command codes
● The control commands are ASCII codes and 3 characters.
● The control commands may include parameters based on the command characteristics.
● The control commands include the termination code as the exit code of the control commands.
The termination code varies with the operations.
<CR> Outputs commands to products.
<CR><LF> Outputs data from the products.
● When entering undefined commands, numerical values, and different decimal point position from the calibration
value, the product replies the character string in the following format.
W□□□□□□?<CR><LF>
● When an error occurs while writing the pre-set values in the EEPROM, the product replies the following format.
ng<CR><LF>
(2) Delimiters
● The delimiter appears as the exit code of the control commands.
● The delimiter varies with the operations.
<CR> Outputs commands, from the external devices to products.
<CR><LF> Outputs data, from the products to external devices.

IM-A-1060G
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2-6. LIST OF CONTROL COMMANDS
Type Contents Functions Command Page
Initial settings (1) To initialize F-12 RES
(2) RS line test RS-
(3) Model SYS
(4) To set transmission modes (RS-232C) MOD
(5) SAVE command /M
Reading (6) To read indicated values GDT1
(7) To read statuses GST
(8) To display original values F-01 GOD
(9) To read pre-set values PRR
Executing (10) Self-check F-05 CHK
(11) HOLD command HLD
(12) RESET command RST
(13 )ZERO command ZAD*
(14) To set operation patterns F-20 SOP*
(15) To set key locks LCK
Settings (16) To execute actual read calibrations F-02 VCL
(17) To execute sensitivity registering calibrations F-03 EIC
(18) To execute numeric value registering calibrations F-19 VRC
(19) To execute TEDS sensitivity registering calibrations EID
(20) To set smoothing functions F-07 SSM*
(21) To set additional values F-08 SZM*
(22) To set Automatic ZERO compensation functions F-09 SZT*
(23) To select bridge excitation voltage F-13 SBV*
(24) To set display updating rates F-21 SDR*
(25) To set LEVEL TEST F-22 LVS*
(26) To set analog outputs (D/A) scaling F-06 OP1*
(27) To set Hold modes F-04 SMF*
(28) To set comparator values SCV*
(29) To set hysteresis F-10 SCV*
(30) To set comparator functions F-23 to F-26 SCF*
Others (31) Response of the undefined command ng
(32) Communication error Error X
Binary code
(RS-485 only)
[1] To establish commumication <ENQ>
[2] To open communication <EOT>
* Corresponding to the SAVE command [/M].