XW-210 WiFi™ Users Manual
6.6.7 Write Single Coil
–
Modbus Function Code 05 (0x05)
Relays may be controlled one at a time.
Request
Start Address (2 bytes):
0x0000 (Relay 1)
Output Value (1 byte):
0x00 (OFF), 0xFF(ON)
Padding (1 byte):
0x00
Response
The response mirrors the requested state, 0x00 or 0xFF.
Errors
Single Coil Write Error Function Code (1 Byte): 0x85
Exception codes (1 Byte):
0x01 – Function not supported.
0x02 – Address out of range.
0x03 – Padding value.
Xytronix Research & Design, Inc.
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