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