WE310F5-X IP2WiFi Legacy AT Command Reference Guide
80664ST11079A Rev. 3
Page 62 of 79
2021-10-25
Not Subject to NDA
Usage
When this command is issued, the TELIT node will enter the ultra-low-power Standby
state (after the optional delay time if present), remaining there until x milliseconds have
passed since the command was issued, or an enabled alarm input is received. Any
current CIDs are lost on transition to Standby. On wakeup, the TELIT node sends the
message Out of Standby-<reason of wakeup> or the corresponding error code,
depending on verbose status.
In Standby, only the low-power clock and some associated circuits are active. Serial
messages sent to the UART port will not be received. The radio is off and packets cannot
be sent or received. Therefore, before requesting a transition to Standby, the requesting
application should ensure that no actions are needed from the interface until the
requested time has passed, or provide an alarm input to awaken the module when
needed. The alarm should trigger about 10 msec prior to issuance of any serial
commands.
The dc_dc_cntl programmable counter is 48-bits and provides up to 272 years worth of
standby duration. Standby is not entered until all pending tasks are completed, and a few
milliseconds are required to store any changes and enter the Standby state; a similar
delay is encountered in awaking from Standby at the end of the requested time.
Therefore, we do not recommend Standby times less than about 32 milliseconds.
Note/Tip:
1.) Before the system enters Standby mode, the Telit node sends a
NULL frame with PM bit set to 1. Once the system is out of Standby
mode, the Telit node sends another NULL frame with PM bit set to
0. This behavior occurs only when radio is in Active ON mode.
2.) Standby can be issued only when an interface or both interfaces
in concurrent mode is/are set to STA mode.
3.) Only Station Mode supports DeepSleep and Standby (AT+PSSTBY
and AT+PSDSLEEP).
