Siemens MC55 - page 324

MC55 AT Command Set

12.7 AT+CMGS s

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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 wi ll 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 m essage. 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 G SM 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 16 0 characters if the

7 bit GSM coding scheme is used, and 140 characters according to the 8 bi t GSM coding scheme.

• At baudrates lower than 19200 it is recommended to use the line terminatio n 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.