Siemens MC55 - Manual (Page 324)

MC55 AT Command Set
12.7 AT+CMGS
s
m
obile
MC55_ATC_V01.05 Page 324 of 469 2/10/04
Confidential / Released
If the
AT^SM20 <CmgwMode>
equals 1 (factory default) any failure to send a message is responded with "OK".
Users should be aware, that despite the "OK" response, the message will not be sent to the subscriber.
If the
AT^SM20 <CmgwMode>
equals 0 any failure to send a message is responded with "ERROR".
• If sending fails due to timeout, then
AT^SM20 <CmgwMode>
=1 causes "+CMS ERROR: Unknown error" to be returned;
AT^SM20 <CmgwMode>
=0 causes "+CMS ERROR: timer expired" to be returned.
• Note that some providers do not recognize an @ symbol used in a short message. A widely used alternative
is typing "*" as defined in GSM 03.40 (GPP TS 23.40).
• All characters entered behind the prompt ">" will be recognized as GSM characters. For example, "Back-
space" (ASCII character 8) does not delete a character, but will be inserted into the short message as an addi-
tional 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.
• 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.
• At baudrates lower than 19200 it is recommended to use the line termination character only (refer to
<n>
of
ATS3
, default
<CR>
) before entering text or PDU. Use of the line termination character followed by the
response formatting character (see
<n>
of
ATS4
, default
<LF>
) can cause problems.