Ebyte ME31-XXAX0060, User Manual, Page: 24 / 29

Chengdu Ebyte Electronic Technology Co.,Ltd.
ME31-XXAX0060_UserManual_EN
Copyright ©2012
–
2023, Chengdu Ebyte Electronic Technology Co.,Ltd
23
2. Control coil (DO) state
Support operation of single coil (05), operation of multiple coils (0F) function code operation.
Use the 05 command to write a single command, for example:
01 05 00 00 FF 00 8C 3A
Modbus address Function code Register first address
Continuity: FF 00
Close: 00 00
CRC check code
After sending the above command to the device through the 485 bus, the device will return the following values:
01 05 00 00 FF 00 8C 3A
Modbus address Function code Register first address Operation method CRC check code
The DO1 coil is turned on.
Use 0F function code as the command to write multiple coils, for example:
01 0F 00 00 00 04 01 0F 7E 92
Modbus
address
Function
code
Initial
address
Number of
coils
Bytes of data Control coil data
CRC check
code
After sending the above command to the device through the 485 bus, the device will return the following values:
01 0F 00 00 OO O4 54 08
Modbus address Function code Register address Number of coils CRC check code
The coils are all on.
3. Read the holding register
Use 03 function code to read one or more register values, for example:
01 03 05 78 00 01 04 DF
Modbus address Function code
Register first
address
Number of registers read CRC check code
After sending the above command to the device through the 485 bus, the device will return the following values:
01 03 02 00 00 B8 44
Modbus address Function code Bytes of data Returned data CRC check code