Siemens MC55 manual Mobile

MC55 AT Command Set

12.7 AT+CMGS

s

mobile

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.

MC55_ATC_V01.05	Page 324 of 469	2/10/04
Confidential / Released