RM520N-GL only ttyUSB0 and ttyUSB1 enumerate on a linux device running linux kernel 5.4.223. This kernel seem to have the needed patches for the 520 to be supported. However as you can see in the dmesg output below, it seems like the VID and PID are for the generic EC25 0x0125 instead of for the rm5…

Check the output of cat /sys/kernel/debug/usb/devices

After looking at it more, I can now see that ttyUSB1 is the AT port, with ttyUSB0 probably being USBDM. So now the question is why is the NMEA port not showing up? I nmea port should be outputing over usb, after checking +QGPSCFG: “outport”,usbnmea. While not actually a problem anymore, does anyone…

[image] skiley: I:* If#= 1 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=40 Driver=(none) This is probably your NMEA interface. The driver is not loaded because of the weird Pid. I would try to fix this using AT+QCFG="usbcfg"

I did see something about usbcfg elsewhere. Makes sense. Also not a necessity, but do you know where I can find info on the other fields of the usbcfg AT command? The RM520N AT Command doc doesn’t have anything on that one.

You need to change what you need to change and keep other values intact. If you google for it you should eventually hit this page: [image] AT+QCFG Descriptions LTE Standard Module Hello, i use the EG91-E. When i type AT+QCFG=? +QCFG: “gprsattach”,(0,1) +QCFG: “nwscanm…

I set the PID to 0x0801 as it should be and that worked! Thanks! Not sure why the PID was wrong, maybe Quectel wanted to support older kernel’s before they patched it in mainline.

RM520N-GL only ttyUSB0 and ttyUSB1 enumerate

IoT Modules 5G Module

jfrog November 10, 2023, 5:51pm 6

You need to change what you need to change and keep other values intact.
If you google for it you should eventually hit this page: