Inquiry: PPP and Transparent Mode Support on Quectel EC200U

IoT Modules LTE Standard Module
1

I am writing to seek clarification on the capabilities of the EC200U modem for our smart metering project. Currently, we have the modem interfaced with a Raspberry Pi via USB, providing internet access through PPP mode.

Our next step involves interfacing the EC200U modem with a smart energy meter via UART. We aim to configure the modem to function as a NIC for the smart meter, enabling it to access the internet directly through UART in transparent mode. Simultaneously, the modem should continue to provide internet access for the Raspberry Pi over USB.

Could you please confirm if the EC200U modem can support this configuration, where it acts as a NIC for the smart meter via UART (Transparent mode) while simultaneously serving as an internet gateway for the Raspberry Pi via USB (PPP mode)?

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2

As I think it is possible.
But make sure that PPP and the TCP/HTTP not use the same CID.

3

Hi Bean,

We are trying to establish a transparent connection between our smart meter and the EC200 module via UART.

However, during testing, we observed that the modem does not respond when we send AT commands over UART. The command we used is:

AT\r\n

We are currently using firmware version EC200UCNAAR03A03M08.

Could you please guide us on how to establish the transparent connection successfully?

Looking forward to your support.

4

First make sure even without the USB connection with RPI the AT over the Uart works as expected.
If the uart is not working always, plese check whether you choose the incorrect port or there exist any other hardware issue.

5

Hi Bean,

We tested the EC200U module without the USB connection to the Raspberry Pi, but it still does not respond to AT commands.

Could you please confirm whether firmware version EC200UCNAAR03A03M08 supports UART communication via AT commands?

6

EC200U support AT over Uart.

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7

Hi Bean,

The AT commands are now working over UART.

Could you please guide us on how to establish a Transparent Mode (TCP/IP) connection via UART?

Looking forward to your support.

8

Please follow the Quectel_LTE_Standard_TCP(IP)_Application_Note_V1.1.pdf.