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Byte 0
Byte 1
Error
Response
Byte 2
Byte 3 ~ 4
Reading the date of the SMS
Byte 0
Byte 1
Byte 2 ~ 3
Command
Byte 4 ~ 5
Byte 6 ~ 7
Byte 0
Byte 1
Correct
Byte 2
Response
Byte 3 ~ 16
Byte 17 ~ 18 CRC-16 check code
Byte 0
Byte 1
Error
Response
Byte 2
Byte 3 ~ 4
Reading the SMS
Byte 0
Byte 1
Byte 2 ~ 3
Command
Byte 4 ~ 5
Byte 6 ~ 7
Byte 0
Byte 1
Byte 2
Correct
Response
Byte 3 ~ 4
Byte 5 ~ 164
The Modbus Address of the SMS-531
= 0x84
Error Code
02: Error format
CRC-16 check code
The Modbus Address of the SMS-531
Function Code = 4
The data address of the received SMS date
Register Count (The inquired count of register. It is
fixed as 7(0x07)
CRC-16 check code
The Modbus Address of the SMS-531
Function Code = 4
Byte Count
Date and Time (ASCII code，yyyyMMddHHmmss)
The Modbus Address of the SMS-531
= 0x84
Error Code:
06: Error format
CRC-16 check code
The Modbus Address of the SMS-531
Function Code = 4
The address of the received SMS content
Register Count (The inquired count of register. It is
fixed as 81(0x51)
CRC-16 check code
The Modbus Address of the SMS-531
Function Code = 4
Byte Count
=0x0000, The data is ASCII code.
=0x0001, The data is Unicode code.
The SMS content. The end char is 0x00 if the data is
ASCII code. If the end char is 0x0000, it is Unicode.
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SMS-531 User's Manual v1.1
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