AT Commands Reference Guide
80529ST10815A Rev.2– 2017-09-14
ReproductionforbiddenwithoutTelitCommunicationsS.p.A.writtenauthorization‐AllRightsReserved page15of233
- 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 do not store the values of any of their possible subparameters.
Moreover:
o The response to the Test Command (trailing =?) may be changed in the future by Telit to allow
the description of new values/functionalities
o 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.
String Type Parameters
A string must be enclosed between quotes or it will not be considered as a valid string type parameter input.
According to V25.ter, space characters are ignored on the command line and may be used freely for
formatting purposes, unless they are embedded on numeric or quoted string constants. Therefore a string
containing a space character has to be enclosed between quotes to be considered a valid string type
parameter (e.g. typing AT+COPS=1,0,”A1” is the same as typing AT+COPS=1,0,A1; typing
AT+COPS=1,0,”A BB” is different from typing AT+COPS=1,0,A BB).
A small set of commands always requires writing the input string parameters within quotes. This is
explicitly reported in the specific descriptions.
Command Lines
A command line is made up of three elements: the prefix, the body and the termination character.
The command line prefix consists of the characters “AT” or “at”, or, to repeat the execution of the previous
command line, the characters “A/” or “a/”.
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