At+Cmgs Send Sms Message - Multi-Tech MultiModem EDGE Reference Manual

12.7 AT+CMGS Send SMS Message

Description:
Test Command Syntax:
Response:
Write Command Syntax:
Response:
Write Command Syntax:
Response:
Notes:
• 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, "Backspace"
(ASCII character 8) does not delete a character, but will be inserted into the short message as an additional
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.
•
Message Length in Text Mode
The maximum length of a short message 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. In case UCS2
character set selected it is highly recommended to set Data Coding Scheme (<dcs> of AT+CSMP) to 16-bit data,
otherwise the length of SMS user data is restricted to 88 octets. Even better for messages with UCS2 character
set is the PDU Mode.
• At baud rates 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.
•
During a pending USSD user interaction the AT+CMGS write command returns "+CME ERROR: operation
temporary not allowed" to prevent blocking situations.
Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371G)
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 message 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.
AT+CMGS=?
OK
If text mode (see AT+CMGF=1)
AT+CMGS=<da>[, <toda>]<CR> Text can be entered. <CTRL-Z>/<ESC>
+CMGS: <mr>[, <scts>]
OK
If sending fails see notes below.
If PDU mode (see AT+CMGF=0)
AT+CMGS=<length><CR> PDU can be entered. <CTRL-Z>/<ESC>
+CMGS: <mr>[, <ackpdu>]
OK
If sending fails see notes below.
Chapter 12 – Short Message Service (SMS) Commands
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