5
0 0 0 0 0
e7
1
e6
1
e5
0
06
The word Hello is represented as C8329BFD06.
Going back to our example, the validity period is ignored and the User data length is 05.
The completed TPDU looks like this:
PDU
Type
Message
Reference
Destination
Address
Protocol
Identifier
Data
Coding
Scheme
Validity
Period
User
Data
Length
User
Data
01 00
0B91515521
4365F7
00 00
05
C8329B
FD06
Sending the SMS message in PDU mode
Now that we have figured out the SCA and TPDU of our SMS message we can go
ahead and send it using the AT+CMSG command.
The format of the command is:
AT+CMSG=<length of TPDU/2> <cr>
>SCA+TPDU < ctrl-Z>
In our example the TPCU is 01000B915155214365F7000005C8329BFD06 which is 36
characters long so we enter:
AT+CMSG=18
The modem responds:
>
We then enter the SCA+TPCU and send ctrl-Z:
>07913121139418F001000B915155214365F7000005C8329BFD06 <ctrl-Z>
The modem will then return:
34
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