Siemens TC37 Module At Command Reference page 131

AT Command Set
Reference
GSM 07.05
TC3X_ATC_01_V04.00
<pdu> In the case of SMS: GSM 04.11 SC address followed by GSM
03.40 TPDU in hexadecimal format: ME/TA converts each octet of
TP data unit into hexadecimal numbers containing two IRA
characters (e.g. octet with integer value 42 is presented to TE as
two characters 2A (IRA 50 and 65)). In the case of CBS: GSM
03.41 TPDU in hexadecimal format.
<index> Index of message in selected storage <mem2>
Note
· After invoking the commands CMGW, CMGS, CMGC wait for the prompt
">" and then start to send text to the module.
· To store the message simply enter <CTRL-Z>. See Execute command
for possible responses.
· Writing can be aborted by entering <ESC>. Of course, the message will
not be stored, though the operation is acknowledged with OK.
· When sending e-mails via SMS the @ character may be replaced with "*"
as defined in GSM 03.40 (3GPP TS 23.040).
· At baudrates lower than 19200 it is recommended to use the line
termination character only (refer to +ATS3, default <CR>, pg. 28) before
entering the text/pdu. Use of the line termination character followed by
the response formating character (refer to +ATS4, default <LF>, pg. 28)
can cause problems.
· All characters entered behind the ">" prompt will be recognized as GSM
characters. For example, "Backspace" (ASCII character 8) does not
delete a character, but will be inserted into the SMS as an additional
physical character. As a result, the character you wanted to delete still
appears in the text, plus the GSM code equivalent of the Backspace key.
See Chapter 7.5 which provides the supported alphabet tables. Also
refer to Chapter 1.5 for general remarks on character sets.
· In text mode, the maximum length of an SMS depends on the used
coding scheme: It is 160 characters if the 7 bit GSM coding scheme is
used, and 140 characters according to the 8 bit GSM coding scheme.
Page 131 of 204 29.05.2002