Wireless Joint

A note for people using any lte modem with custom lte connection scripts on casual Linux distributions. After upgrading my Ubuntu 20.04 suddenly I had all sort of issue with the at commend serial interface. Minicom hang during the session , output of at commands was truncated e.t.c. I got suspicious ...

Sixpack99 wrote: Sat Oct 30, 2021 4:09 pm

nkefgr wrote: Sat Sep 04, 2021 12:41 pm The only unexplained issue is why the windows driver does not bring up the AT serial interface.

Did you ever figure out how to get the serial interface working in Windows?

Unfortunately no.

I also asked at the sierra wireless forum and a forum user gave a workaround for the issue !
It seems that the modem exposes the AT serial interface but the driver does not recognizes it.

I:* If#= 4 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=30 Driver=(none)
E: Ad=84(I) Atr=02(Bulk) MxPS=1024 Ivl ...

That looks like a router, not an adapter, and that shows as a mini-pcie modem router. Maybe you linked the wrong item?

My adapter doesn't have this issue. I think the board you have isn't setting the modem into USB mode. It isn't a command, it's a pin voltage.


These is the adapter https://fb ...

Ohhhhhh!!!

Which adapter are you using?


I got one demo adapter board from a good Chinese manufacturer https://www.facebook.com/LTE-roter-1687936271740/ , it will be available soon for sale.

I tested it also tested with Windows drivers, the modem only exposes the Serial Wireless DM port and ...

I want to use MBIM mode + serial interfaces (/dev/ttyUSBxx) , i cant sent AT commands for the moment.

Hi all,
i started testing an EM9191 with a compatible adapter. I am using the Ubuntu 20.04 lts with 5.11.0-27-generic kernel. The modem is recognized and brings up the cdc-mbim interface but not serial inteface (/dev/ttyUSBxx). I was able to connect successfully via mbim.
I know that is has to do ...

I think I figured it out, in Telit lm960 software user guide it states
"Suppose that the 4G Technology is present on the air. Use the command AT+WS46=28 to force
the module in 4G mode."
In the AT command reference it is reported with a very technical terminology and I missed it.

So for LTE only ...

Hi,
I went through the Telit LM960 Series AT Command Reference, but i was not able to find how to configure it to connect to LTE only.

For example the Quectel EM12-G which I am also using, it can be configured with the following at command: