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FIBOCOM L860 AT Commands User Manual
Page 10 of 254
1 Preface
1.1 Target Audience
This manual is intended for the developers who need to communicate with the L8 family devices using the
AT commands.
2 Introduction to AT Commands
2.1 AT Commands Overview
AT commands are sets of commands used for communication with the cellular modem. AT commands are
comprised of assemblies of ASCII characters which start with the "AT" prefix (except the commands A/
and +++). The AT prefix is derived from the word Attention, which asks The modem to pay attention to the
current request (command).
AT commands are used to request services from the cellular modem, such as:
Call services: dial, answer and hang up
Cellular utilities: send/receive SMS
Modem profiles: Auto Answer
Cellular Network queries: GSM signal quality
2.2 General System Abbreviations
The basic system configuration contains a modem and a terminal.
The L8 family is the modem unit and may be referred to as the DCE or TA, such as the phone, the mobile
or the radio.
The terminal (PC or MCU) may be referred to as the DTE or the TE.
2.3 AT Commands Protocol
The AT commands interface is basically a Modem Services upon Request.
Communication (almost) always begins from the TE side. This means that any service should be
requested from the TE. Thus a request is called a "Command".