October 11, 2013, 6:16am
How to implement a dual sim for SL8082 module?
I looked topics:
and Dual SIM Application Note.
But the module does not have a SIMPRESS pin.
Is it possible to switching sim without resetting modem?
Thanks for any ideas.
October 15, 2013, 1:15am
There are no SIMPRESS pin on SL8082 and the application note you mentioned is mainly for 2G product.
However, it is possible to configure SIMLPM to 2 so SIM interface will be powered down during low power mode, and you can switch the SIM in that mode.
October 16, 2013, 3:01am
OK, re-registration through the LPM, it’s good idea.
October 18, 2013, 4:42am
Sorry, I have some questions about the LPM.
My SL8082 is controlled by AT commands (via USB)
It is proposed algorithm SIM switching:
Command to activate LPM
Command to switch SIM
Command to deactivate LPM
Will the active USB when entering the LPM? Will I be able to switch the SIMs after LPM activation?
Is there a AT-command to activate/deactivate LPM, or be activated by W_DISABLE only?
I’ve look Extended AT Command Reference. There is an option for AT!PCINFO:
But I found the AT!SLEEP command only (enable/disable sleep):
The modem supports a low-power sleep state that occurs when the feature is enabled
and specific operating conditions are met (for example, there is no data traffic over USB,
no OTA traffic, etc.).
Are LPM and SLEEP different things?
October 22, 2013, 4:24am
Sorry, maybe I should make it clear…
Please try below:
AT!CUSTOM=“SIMLPM”,2 (disable SIM interface in LPM)
Command to activate LPM (AT+CFUN=4)
Command to switch SIM (maybe you use GPIO? AT!DIO)
Command to deactivate LPM (AT+CFUN=1)
For your question
Enter and out of LPM does not involve module reboot, e.g. USB will remains active during the process.
W_DISABLE is possible, you can also try AT+CFUN=x as mentioned.
sleep is different from LPM, in which the most function (e.g. RF/SIM) is active in sleep mode.
In LPM, RF/SIM is disabled(if configured probably).
October 23, 2013, 4:46am
I get it, thank you very much!