Need help with accessing internet through Quectel EG915N-EU

IoT Modules LTE-A Module
1

Hello!

I have a modem with a Quectel EG915N-EU chip that I’d like to use with my Windows laptop to access the internet. I am communicating with the modem via RS485 using a USB adapter. I’ve managed to connect and send AT commands to the modem using Putty, and I’m receiving responses to most commands. The SIM card is confirmed to be working, as I was able to use an AT command to successfully call my phone.

I also tried adding the modem to Windows via the “Phone and Modem” settings by selecting the appropriate COM port, but I couldn’t get it to work on the IP level. While I couldn’t find a specific driver for this exact model, I wanted to try a different version. However, since the RS485-USB adapter also requires a driver, I can’t install a modem driver for the same COM port.

Can anyone help me figure out how to solve this issue? Is it even possible? I’m relatively new to this field, so my knowledge of modems is quite limited. Any help would be greatly appreciated!

(Firmware version: EG915NEUAGR03A09M16)

2

Could you show the device manager?

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3

Are you using USB or Uart?
You can use AT to check
AT+QCFG=“usbnet”

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4

This is all I got under the Ports section. Above you can see that I tried to add it as a standard 9600 bps modem.
device_manager

5

I didn’t see the USB AT port.
And how you send the AT to the EG915N-EU?

6

Sorry but I had to wait an hour to reply.

The modem has an RS485 RJ45 connector, and I’m using a cat5e UTP cable, and this USB/RS485 dongle:

rs485_adapter
rs485_adapter788×551 199 KB

I use Putty to send the AT commands through the serial port.

The AT command you’ve suggested gave me this output: +CME ERROR: 4
I checked it and it means: Operation not supported
I tried AT+QCFG=? as well and for that I got CME ERROR 50. (incorrect parameters)

7

I think it is the way you sent AT command incorrect.
It must support the AT+QCFG=“usbnet”.

I want to know which port you sent the AT.
USB Serial Port(COM3) orthe Standard 9600 bps Modem.

8

I used the Serial Port (COM3) in Putty with 9600bps, 8 data bits, 1 stop bits and no parity. I can’t choose the standard 900bps modem. Is there an other way to send AT commands?

9

You need to speak to the modem manufacturer, not to the individual chip manufacturer(s).

10

Okay, I can give it a try. Why would the manufacturer matter though? What influence does the manufacturer have? If I understand correctly, modems only communicating with AT commands and I can use it with this connection.

11

If you can’t even send AT commands, then we can’t help you. If you need help, please show how the module is connected and provide a hardware schematic.