Dual sim for sl8082

Legacy Open AT
1

Hello,
How to implement a dual sim for SL8082 module?
I looked topics:
/viewtopic.php?f=121&t=2944&p=17661&hilit=dual+sim#p17661
/viewtopic.php?f=118&t=5840&p=24548&hilit=dual+sim#p24548
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.

2

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.

3

Hi, Lotam.
OK, re-registration through the LPM, it’s good idea.
Many thanks!

4

Sorry, I have some questions about the LPM.

My SL8082 is controlled by AT commands (via USB)
It is proposed algorithm SIM switching:

  1. Command to activate LPM
  2. Command to switch SIM
  3. Command to deactivate LPM

Questions:

  1. Will the active USB when entering the LPM? Will I be able to switch the SIMs after LPM activation?
  2. 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):

  1. Are LPM and SLEEP different things?
5

Hi siem,

Sorry, maybe I should make it clear…

Please try below:
0) Setup:
AT!CUSTOM=“SIMLPM”,2 (disable SIM interface in LPM)
AT!RESET

  1. Command to activate LPM (AT+CFUN=4)
  2. Command to switch SIM (maybe you use GPIO? AT!DIO)
  3. Command to deactivate LPM (AT+CFUN=1)

For your question

  1. Enter and out of LPM does not involve module reboot, e.g. USB will remains active during the process.
  2. W_DISABLE is possible, you can also try AT+CFUN=x as mentioned.
  3. 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).

Thx.

6

Hi, lotam

I get it, thank you very much! :smiley: