Ec200A and Usb modern mode

IoT Modules LTE Standard Module
1

Hello guys,
I am using module EC200A and connect to my PC Ubuntu 20.4. My PC recognizes it cdc_ethernet, you can see from dmesg:

[ 6141.331842] usb 1-12: new high-speed USB device number 19 using xhci_hcd
[ 6141.480532] usb 1-12: New USB device found, idVendor=2c7c, idProduct=6005, bcdDevice= 3.18
[ 6141.480533] usb 1-12: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 6141.480534] usb 1-12: Product: Android
[ 6141.480534] usb 1-12: Manufacturer: Android
[ 6141.480535] usb 1-12: SerialNumber: 0000
[ 6141.485347] cdc_ether 1-12:1.0 usb0: register ‘cdc_ether’ at usb-0000:00:14.0-12, CDC Ethernet Device, 02:0c:29:a3:9b:6d
[ 6141.495624] cdc_ether 1-12:1.0 enp0s20f0u12: renamed from usb0

  • lsusb also shows modem:
    Bus 001 Device 023: ID 2c7c:6005

However there are no /dev/ttyUSB* files, so I cannot use it.

How can I switch to usb modern mode to have /dev/ttyUSB* and send AT command to it.
I have used this module on another linux Embedded board and it works great but when i plug it into my PC it’s like this.
Thanks for your help.

2

Please show the output of cat /sys/kernel/debug/usb/devices

3

Output of cat /sys/kernel/debug/usb/devices:

T: Bus=01 Lev=01 Prnt=01 Port=11 Cnt=05 Dev#= 16 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=2c7c ProdID=6005 Rev= 3.18
S: Manufacturer=Android
S: Product=Android
S: SerialNumber=0000
C:* #Ifs= 5 Cfg#= 1 Atr=e0 MxPwr=500mA
A: FirstIf#= 0 IfCount= 2 Cls=02(comm.) Sub=06 Prot=00
I:* If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=06 Prot=00 Driver=cdc_ether
E: Ad=87(I) Atr=03(Int.) MxPS= 64 Ivl=4096ms
I: If#= 1 Alt= 0 #EPs= 0 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_ether
I:* If#= 1 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_ether
E: Ad=83(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=0c(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 2 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)
E: Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=0b(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)
E: Ad=89(I) Atr=03(Int.) MxPS= 64 Ivl=4096ms
E: Ad=86(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=0f(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)
E: Ad=88(I) Atr=03(Int.) MxPS= 64 Ivl=4096ms
E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=0a(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms

Sorry for the late reply

4

You need to manually add your modem ID’s to the standard option driver:
# echo "2c7c 6005" > /sys/bus/usb-serial/drivers/option1/new_id

This change is temporary, so you will need to re-run this after reboot.

5

It works.
Thanks so much.

6

Dear Support!

I have the exact same output for /sys/kernel/debug/usb/devices but i dont have usb-serial folder (option) so i cant run the “echo “2c7c 6005” > /sys/bus/usb-serial/drivers/option1/new_id”. I think i dont have any driver running, it’s a plain Debian 12.

Can you send me the driver?

Is it necessary to use ttyUSB to use the modem, or is cdc ether sufficient?

Thanks!

7

Execute modprobe option first.

8

Wow! Thanks for the quick reply, ttyUSB0, 1 , 2 has appeared!