To initiate from 1 to 20 SMS messages:

 

AT+CMGS=(enter e-mail address here), enter 

 

This will switch the modem from data mode to SMS mode and enter the e-mail address. Note that after a 5 second pause, D6, the FAM MODE-AUX LED, will start blinking signifying that you have entered SMS mode and a > prompt will appear on the screen. At the < prompt enter the desired SMS message. The message length may be up to 170 characters/bytes long. This total includes the previously entered e-mail address. 

 

After delivery of the SMS message you will see the prompt:

 

+CMGS:11

OK

 

To send more messages re-enter:

 

AT+CMGS=<enter e-mail address or phone number here>

<enter>

 

You can deliver up to 20 SMS messages in one session without going back to data mode. After prolonged inactivity of approximately 120 seconds, the modem will automatically switch back to data mode. This transition normally takes about 20 seconds.

 

To leave the SMS mode and return to data mode, enter

 

AT, <enter>

 

There will be a 20 second delay during mode reset before you return to data mode and receive the OK prompt.

 

The following are the commands that may be used in conjunction with SMS. They are based on the standard GSM command set.

 

+CMGD        Delete message from storage

 

 

This command deletes the stored message at location <index>. Note that the index values change whenever a new message is received, sent or deleted. A valid way to perform a series of deletes is to delete the highest numbered index first.

 

+CMGL        Read several messages from storage

 

 

+CMGL: <index>,<stat>,<oa/da>,,<scts><CR><LF>

<data><CR><LF>[…]

 

This command will read back all messages in storage that match the <stat> parameter. Response will be generated for each stored message.

 

+CMGR        Read a single message from storage

 

 

+CMGR: <index>,<stat>,<oa/da>,,<scts><CR><LF><data><CR><LF>

 

This command reads back the message at location <index>.

 

+CMGS        Send a message (directly)

 

><data><^Z/ESC>

 

This command sends the message <data> to the telephone number or URL <da>.

 

+CMGW       Write a message to storage

 

><data><^Z/ESC>

 

 

This command stores the message <data>. No address <da> information is saved with the message.

 

+CMSS         Send a message from storage

 

 

This command sends the message stored at location <index> to the telephone number or URL <da>.

 

 

<index>         Storage location (1-30)

 

<da>            Destination address

<oa>            Origin address

<scts>                    Service center time stamp

<data>                    Message text content

 

<stat>           0 – Received unread message                “REC UNREAD”