Telit LE910 V2 Series AT Commands
80446ST10707A Rev. 0– 2015-11-03
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 26 of 509
Mod. 0808 2011-07 Rev.2
3.2.4. Command Response Time-Out
Every command issued to the Telit modules returns a result response, if response codes are
enabled (default). The time needed to process the given command and return the response varies,
depending on the command type. Commands that do not interact with the SIM or the network,
and only involve internal setups or readings, have an immediate response.Commands that
interact with the SIM or the network could take many seconds to send a response, depending on
SIM configuration (e.g., number of contacts stored in the phonebook, number of stored SMS), or
on the network the command may interact with.
3.2.5. Command Issuing Timing
The chain Command -> Response shall always be respected and a new command must not be
issued before the module has terminated all the sending of its response result code (whatever it
may be).
This applies especially to applications that “sense” the OK text and therefore may send the next
command before the complete code <CR><LF>OK<CR><LF> is sent by the module.
It is advisable anyway to wait for at least 20ms between the end of the reception of the response
and the issue of the next AT command.
If the response codes are disabled and therefore the module does not report any response to the
command, then at least the 20ms pause time shall be respected.
3.3. Storage
3.3.1. Factory Profile And User Profiles
The Telit wireless modules stores the values set by several commands in the internal non
volatile memory (NVM), allowing to remember this setting even after power off. In the NVM
these values are set either as factory profile or as user profiles: there are two customizable
user profiles and one factory profile in the NVM of the device: by default the device will start
with user profile 0 equal to factory profile.
For backward compatibility each profile is divided into two sections, one base section which
was historically the one that was saved and restored in early releases of code, and the extended
section which includes all the remaining values.
The &W command is used to save the actual values of both sections of profiles into the NVM
user profile.
Commands &Y and &P are both used to set the profile to be loaded at startup. &Y instructs the
device to load at startup only the base section. &P instructs the device to load at startup the full
profile: base + extended sections.
The &F command resets to factory profile values only the command of the base section of
profile, while the &F1 resets to factory profile values the full set of base + extended section
commands.
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