ICP DAS USA SMS-531 User Manual page 43

(2) The host needs to send the SMS content command to define the variable part of the
alarm SMS first. Then, send the transmitting SMS command.
Commands and Description:
Setting the variable
SMS content
Command
Transmitting the SMS
1. Set the variable SMS content as "+VSMS".
2. Send the SMS.
3. The content of the SMS is the "On Message" field of Alarm Channel1
Description
and the variable content.
4. Transmitting the SMS to the phones of group1
The phone numbers in group1 would receive the SMS. The content of the
Result
SMS is "Channel1 ON+VSMS".
Format Description:
Setting the variable SMS content
Byte 0
Byte 1
Byte 2 ~ 3
Byte 4 ~ 5
Command
Byte 6
Byte7 ~ 18
Byte19 ~ 20 CRC-16 check code
Byte 0
Byte 1
Byte 2 ~ 3
Correct
Response
Byte 4 ~ 5
Byte 6 ~ 7
Byte 0
Error
Response
Byte 1
01 10 01 7F 00 06 0C 2B 00 56 00 53
Command
00 4D 00 53 00 00 00 E7 DD
Response 01 10 01 7F 00 06 702F
Command 01 05 00 01 FF 00 DD FA
Response 01 05 00 01 FF 00 DD FA
The Modbus Address of the SMS-531
Function Code = 16
The start address of the variable content of the SMS
Register Count: The quantity of the SMS content (The
max is 16 chars)
Byte Count (Register Count x 2)
Variable SMS Content (Unicode) : In this example, it is
"+VSMS" messages and the end char is 0x0000. If the
quantity is 16, it needs not the end char.
The Modbus Address of the SMS-531
Function Code = 16 (0x10)
The start address of the variable content of the SMS
Register Count: The quantity of the SMS content (The
max is 16 chars)
CRC-16 check code
The Modbus Address of the SMS-531
= 0x90
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SMS-531 User's Manual v1.1