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Chapter 2 – AT Command Features
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 10
Chapter 2 – AT Command
Feat ures
Line Settings
A serial link handler is set with the following default values (factory settings):
• Autobaud
• 8 bits data
• 1 stop bit
• no parity
• RTS/CTS flow control
Please use the +IPR, +IFC and +ICF commands to change these settings.
Command Line
Commands always start with AT (which means ATtention) and finish with a <CR> character.
Information Responses and Result Codes
Responses start and end with <CR><LF>, except for the ATV0 DCE response format and the ATQ1 (result code
suppression) commands.
• If the command syntax is incorrect, an ERROR string is returned.
• If the command syntax is correct but transmitted with the wrong parameters, the +CME ERROR: <Err> or +CMS
ERROR: <SmsErr> strings are returned with adequate error codes if the CMEE was previously set to 1. By
default, CMEE us set to 0, and the error message is only “ERROR”.
• If the command line has been performed successfully, an OK string is returned.
In some cases, such as “AT+CPIN?” or (unsolicited) incoming events, the product does not return the OK string as a
response.