ICP DAS USA SMS-531 User Manual page 60

Command Format:
Send the alarm 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
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
The Modbus Address of the SMS-531
Function Code = 0x05
Alarm Channel
=0xFF00 or =0x0000
CRC-16
The Modbus Address of the SMS-531
= 0x85
Error Code
06: Buffer overflow
13: Alarm status are the same (EX: Original status is ON,
want to change the status to ON)
CRC-16
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SMS-531 User's Manual v1.1