Quectel cdc communication

IoT Modules LTE Standard Module
1

Hi,
i’m trying to use CDC communication of quectel module with a controller board but, the detection of quectel device is not taking place with the controller. Is there any solution or any application note to it and it would be good if someone responds soon as the project is on hold.

Thank you,
Gagana

2

hello, could you please tell us your current module type or firmware version? thanks~

3

Hi Niki,
quectel EC25-E module and the firmware version is Rev: EC25-E-FA_Firmware_Release_Notes_V0807_20.201.20.201

used these commands as well to configure it to usb
AT+QCFG=“usbnet”,0
AT+CFUN=0
AT&W
AT+CFUN=1,1

thanks & regards,
gagana

4

Could you tell me which kind of the host do you try? Is it Linux or just MCU or any kind of RTOS?

5

Does the modem connect with host via USB?

6

Hi bean,
My host is IMXRT1050 evk board, i’m using bare metal coding and yes it does connect with usb while using qcom/qnavigator to send AT commands.

Thanks & Regards,
Gagana

7

If it is a MCU that runs bare code or RTOS, I am afraid you should solve the problem how the host can recognize the USB device.
I just can provide the USB descriptors for the modem.

8

Hi bean,
I do have the USB descriptors datasheet with me for the modem(EC-25) but i’m trying to use USB AT descriptors in the datasheet , is that correct or should i use somenthing else.

Thanks & Regards,
Gagana

9

In the USB descriptors, you can find the USB AT interface and the USB endpoint. You should send the AT with that endpoint.