Yokogawa EJX930A - Manual (Page 34)

<5. Modbus Communication>
5-3
IM 01C25R05-01EN
5.4.6 08 (0x08) Diagnostics
Support only Return Query Data which reply
receiving data.
Not corresponding to Broadcast.
Request
Items Size [byte] Data
Address 1 1 to 247
Function code 1 0x08
Sub-function 2 0x0000 *1
Data N Any
CRC 2 -
*1: 0x0000; Support only Return Query Data
Response
Items Size [byte] Data
Address 1 1 to 247
Function code 1 0x08
Register Address 2 0x0000
Register Value N Request Data
CRC 2 -
5.4.7 16 (0x10) Write Multiple registers
Write data to Holding Registers from the Specified
Starting Address to specified quantity.
Corresponding to Broadcast.
Request
Items Size [byte] Data
Address 1 1 to 247
Function code 1 0x10
Starting Address 2 0x0000 to 0xFFFF
Quantity of
Registers
2 -
Byte Count 1 N *1 ×2
Registers Value *2 N *1 ×2 value
CRC 2 -
*1: N: The quantity specified by the Quantity of Registers.
*2: Transmitted by the order: Upper- Lower from the specified
Starting Address.
E.g. 10 in FLOAT format, Transmit order is as
0x41200000.
Response
Items Size [byte] Data
Address 1 1 to 247
Function code 1 0x10
Starting Address 2 0x0000 to 0xFFFF
Quantity of
Registers
2 -
CRC 2 -
5.5 Response error code
(1) The message format at error
The device returns the following message without
any operation when incompatibility exists in the
message other than communication error.
Response
Items Size [byte] Data
Address 1 1 to 247
Error code 1 *1
Exception code 1 Refer to following
exception code
CRC 2 -
*1: Error code
Received Function Code(Hex) + 80(Hex) is entered
E.g. When exception is detected in function code 0x01,
Error Code is set to 0x81.
(2) Exception code
Error
code
Name Meaning
0x01 ILLEGAL
FUNCTION
Function code does not exist
0x02 ILLEGAL DATA
ADDRESS
Specified address is out of
range
0x03 ILLEGAL DATA
VALUE
Specified data is out of quantity
0x04 SLAVE DEVICE
FAILURE
Failure during response
process
(CAP, AMP EEPROM
Failure(AL.01, AL.02))
0x06 SLAVE DEVICE
BUSY
Cannot respond because of
under processing