AT Commands Reference Guide
80529ST10815A Rev.2– 2017-09-14
ReproductionforbiddenwithoutTelitCommunicationsS.p.A.writtenauthorization‐AllRightsReserved page37of233
S Parameters
Basic commands that begin with the letter “S” are known as “S-Parameters”. The number following the “S”
indicates the “parameter number” being referenced. If the number is not recognized as a valid parameter
number, an ERROR result code is issued.
If no value is given for the subparameter of an S-Parameter, an ERROR result code will be issued and the
stored value is left unchanged.
NOTE: what follows is a special way to select and set an S-Parameter:
1) ATSn<CR> selects n as current parameter number. If the value of n is in the range (0, 2, 3, 4, 5, 7, 10,
12, 25, 30, 38), this command establishes Sn as last selected parameter. Every values out of this range and
lower than 256 can be used but have no meaning and are maintained only for backward compatibility with
landline modems.
2) AT=<value><CR> or ATS=<value><CR> set the contents of the selected S-parameter
Example:
ATS7<CR> establishes S7 as last selected parameter.
Reference: V25ter and RC56D/RC336D
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