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TC63_ATC_V00.490

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5/24/05

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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 

. After the prompt a timer will be started to observe the input.

To abort sending use 

. Abortion is acknowledged with "OK", though the message will not be sent.

The message reference 

 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. 

• If sending fails, for example, if a message is too long, the result code depends on the current setting of the

 command:

 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.

 equals 0 any failure to send a message is responded with "ERROR". 

• If sending fails due to timeout, then 

=1 causes "+CMS ERROR: Unknown error" to be returned;

=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. 

Test Command

AT+CMGS=?

Response(s)

OK

Write Command

If text mode (see 

=1) 

[, 

]

 Text can be entered. 

/

Response(s)

[, 

OK
If sending fails see notes below.

Write Command

If PDU mode (see 

=0) 

 PDU can be entered. 

/

Response(s)

[, 

]

OK
If sending fails see notes below.

Reference(s)

PIN

ASC0 ASC1 USB MUX1 MUX2 MUX3 Charge

4

Last

GSM 07.05

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