USIM2 to secondary slot


How to switch GPIO to connect USIM2 to secondary slot?
May be we have some document or part of normal scheme that we can see GPIO pins and how it is working.

echo N > /sys/class/gpio/export
I try find it on PDF schema but it is really hard.
Thanks a lot.


You dont need to do anything on the GPIO.
#1. Run the following commands
root@swi-mdm9x15:~# microcom -E /dev/ttyAT
#2. Power down the unit , insert SIM in slot 2,
#3. ensure pin 4 of SW401 is low
#4. Power up the unit
Run the following command:
root@swi-mdm9x15:~# cm sim info

You should read sim in second slot.


Thanks for answer.
But i want read sim in Secondary CF3 slot. I insert to it HL modem. I see modem in dmesg. I need switch secondary sim with mux 3 to secondary CF3 slot.


does the HL module you plan to use support SIM2 interface?

I do not know. It is HL77xx series. I develop a test equipment for this module iperf, tcpdump etc… It is new module and i think it support that feature.

Best regards,

HL77xx doesnt support dual sim.

We have to modules connecting via usb WP7502 & HL77xx And 2 sim slots. How could I connect a sim card to HL77?

I am not clear what you are doing.Let me try:
You are using mangOH Green.
CF3 slot 1: WP7502
CF3 slot 2: HL77

Is that correct?

Yes it is.
mangOH green rev 8

So, is that the correct config? You plan to use two CF3 modules simultaneously?

Yes it is.
First WP module like Linux host and normal LTE connection.
Second HL77 module like LPWAN channel

Please change R820 to 10K and DNI R833.