Function 0X42 - Write Module Setting - Protech Systems SI-W309 User Manual

4.2.6 Function 0x42 – Write Module Setting
This function code is used to write SI-W309 module setting.
Request
Offset
00 Slave ID address
01 Function Code
02 ~ 03 Address of Holding
Register
04 ~ 05 Data Packet
06 ~ 07 CRC
Response
Offset
00 Slave ID address
01 Function Code
02
03 Readback Data
04 ~ 05
Error Response
Offset
00 Slave ID address
01 Function Code
02
03 ~ 04
SI-W309 SERIES USER MANUAL
Description
Description
Byte Count
CRC
Description
Data
CRC
Chapter 4 MODBUS RTU Protocol
Counts
1 Byte 1 to 255
1 Byte 0x42
2 Bytes
•
0x0020: Baud Rate Setting
•
0x0030: Device ID
Refer to Section 4.3 Address
2 Bytes
Mapping.
2 Bytes Produced by utility.
Counts
1 Byte 1 to 255
1 Byte 0x42
1 Byte 0x01
Refer to Section 4.3 Address
1 Bytes
Mapping.
2 Bytes Produced by firmware
Counts
1 Byte 1 to 255
1 Byte 0xC2
1 Byte 0xCD: No Function
2 Bytes Produced by firmware.
Data
Data
Data
Page: 4-12