AT Commands User Manual 1 Introduction 1.1 Purpose of the document This document describes the messages exchanged between an external application and the N701 mobile station based on AT commands in order to control incoming / outgoing calls, SMS administration, mobile station behavior and GPRS connections. 1.2 Terms and Abbreviations AT AT Command Interpreter Software Subsystem, or attention. CB Cell Broadcast. CM Connection Management. DA Destination Address. DCE Data Communication Equipment. DTE, TE Data Terminal Equipment. L3 Layer 3. ME Mobile Equipment. MN Mobile Network Software Subsystem. MO Mobile Originated. MS Mobile Station. MT Mobile Terminated. PDU Protocol Data Unit.
SC Service Centre. SI SIM Application Part Software Subsystem. SIM Subscriber Identity Module. SMS Short Message Service. TA Terminal Adapter. 2 AT commands features 2.1 Serial interface settings The serial driver works after start up with the following settings: Data-rate: − 115200 bps. − 1 stop bit. − Even parity. − RTS/CTS flow control (HW flow control). Please use the commands +IPR, +IFC, +ICF to change these settings. 2.2 Command line The commands start normally with AT (means Attention) and finishes with a character. Only for writing or sending a SMS Ctrl + Z or ESC terminates the command; is used between the 2 parts of the SMS (address and text).
2.3 Default values If the command parameters are optional, they can be also left out in the command line. In such cases normal default values are assumed as follows: in case of integer type parameters, the default value is 0, except 7