MC55_ATC_V04.00 Page 342 of 475 3/17/06
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13.7 AT+CMGS Send Short Message
The write command transmits a short message from TE to network (SMS-SUBMIT).
After invoking the write command wait for the prompt ">" and then start to write the message. To send the mes-
sage simply enter
<CTRL-Z>. After the prompt a timer will be started to observe the input.
To abort sending use
<ESC>. Abortion is acknowledged with "OK", though the message will not be sent.
The message reference <mr> is returned to the TE on successful message delivery. The value can be used to
identify the message in a delivery status report provided as an unsolicited result code.
Syntax
Notes
• If sending fails, for example, if a message is too long, the result code depends on the current setting of the
AT^SM20 command:
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.
Test Command
AT+CMGS=?
Response(s)
OK
Write Command
If text mode (see AT+CMGF=1)
AT+CMGS=<da>[, <toda>]
<CR> Text can be entered. <CTRL-Z>/<ESC>
Response(s)
+CMGS: <mr>[, <scts>]
OK
If sending fails see notes below.
Write Command
If PDU mode (see AT+CMGF=0)
AT+CMGS=<length>
<CR> PDU can be entered. <CTRL-Z>/<ESC>
Response(s)
+CMGS: <mr>[, <ackpdu>]
OK
If sending fails see notes below.
Reference(s) PIN ASC0 ASC1 MUX1 MUX2 MUX3 Charge  Last
GSM 07.05 % % % % % % ! ! !
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