ICP DAS USA I-7530A-MR-FD User Manual page 106

The "Modbus Configuration" is used for setting Modbus Write Coil
/Registers commands. Before using this configuration, you must know
what is the Modbus Write Coil/Registers format that the Modbus slave
devices supported. After setting done, the I-7530A-MR-FD will start to
access the Modbus slave devices when receiving a CAN data frame
with IO data.
Modbus write signal Coil/Registers format:
Node Function
ID Code
Modbus write multiple Coil/Registers format:
Node Function Start
ID Code Address
 Slave Node ID:
Set the Modbus slave ID which you want to access.
 Function Code:
In this setting interface, it supports the function code 0x05, 0x06, 0x0F,
and 0x10.
 Start Address (High):
This field indicates the high byte of Modbus reference IO data
address.
 Start Address (Low):
This field indicates the low byte of Modbus reference IO data address.
 Bit Count(High):
This filed indicates the high byte of number of bits which you want to
write. If the function code is 0x05 or 0x06, this field will be disabled.
I-7530A-MR-FD Modbus RTU to CAN Converter User's Manual (Version 1.0, 08/2022) ------------- 106
Start Start
Address Address
Start Bit/Word
Address Count
Bit/Word Bit/Word
Count Count
Bit/Word Byte
Count Count
CRC
...
IO CRC
...
Data
CRC
CRC