Specifications

UC864-E/G AT Commands Reference Guide

80304ST10041a Rev. 3 - 18/07/08

3.2 AT Command Syntax

The syntax rules followed by Telit implementation of either Hayes AT commands and GSM/WCDMA

commands are very similar to those of standard basic and extended AT commands.

There are two types of extended command:

- Parameter type commands. This type of commands may be “set” (to store a value or values for

later use), “read” (to determine the current value or values stored), or “tested” (to determine ranges

of values supported). Each of them has a test command (trailing =?) to give information about the

type of its subparameters; they also have a Read command (trailing ?) to check the current values

of subparameters.

- Action type commands. This type of command may be “executed” or “tested”.

• “executed“ to invoke a particular function of the equipment, which generally involves more

than the simple storage of a value for later use

• “tested” to determine:

whether or not the equipment implements the Action Command (in this case issuing the

correspondent Test command - trailing =? - returns the OK result code), and, if

subparameters are associated with the action, the ranges of subparameters values that

are supported.

Action commands don’t store the values of any of their possible subparameters.

Moreover:

The response to the Test Command (trailing =?) may be changed in the future by Telit to

allow the description of new values/functionalities

If all the subparameters of a parameter type command +CMD (or #CMD or $CMD) are

optional, issuing AT+CMD=<CR> (or AT#CMD=<CR> or AT$CMD=<CR>) causes the OK

result code to be returned and the previous values of the omitted subparameters to be

retained.