SMS-531 User’s Manual v1.1
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Byte 2
Error Code
02: Format error
Byte 3 ~ 4 CRC-16 check code
Sending the SMS
Command
Byte 0
The Modbus Address of the SMS-531
Byte 1
Function Code = 0x05
Byte 2 ~ 3
Alarm Channel
Byte 4 ~ 5
=0xFF00, Sending the field content of “On Message”
=0x0000, Sending the field content of “Off Message”
Byte 6 ~ 7 CRC-16 check code
Correct
Response
Byte 0
The Modbus Address of the SMS-531
Byte 1
Function Code = 0x05
Byte 2 ~ 3 Alarm Channel
Byte 4 ~ 5 =0xFF00 or =0x0000
Byte 6 ~ 7 CRC-16 check code
Error
Response
Byte 0
The Modbus Address of the SMS -531
Byte 1
= 0x85
Byte 2
Error Code
06: Buffer overflow
Byte 3 ~ 4 CRC-16 check code
