Ebyte ME31-AAAX2240, Руководство пользователя, Страница: 28 / 34

Chengdu Ebyte Electronic Technology Co.,Ltd. ME31-AAAX2240_UserManul_EN
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01 05 00 00 FF 00 8C 3A
Modbus address Function code Register first address
On
：
FF 00
Off
：
00 00
CRC check code
After the above command is sent 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
DO1 coil conduction
Use the 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
Starting
address
Coil number
Number of
bytes of data
Data of control
coil
CRC check
code
After the above command is sent 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 Coil number CRC check code
All coils are conducted.
3. Read Holding register
Use the 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 register read CRC check code
After the above command is sent 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
Number of bytes of
data
Data returned CRC check code
The above 00 00 indicates that DO1 is in level output mode.
4. Operate Holding register
Support operation of single register (06), operation of multiple registers (10) function code operation.