How to trace nrf9160 customer board at cellular monitor?

[Jeffery]

Hi Nordic

Q1.

HW: nrf9160 customer board. One USB-to-RS232 cable is used for PC sending AT commands (UART2). 

        Another USB-to-RS232 cable is used for PC collecting modem trace (UART1).

FW: modem version 1.3.5 + ncs2.4.2 serial lte modem (modem trace enabled)

After opening cellular monitor, it needs "SELECT DEVICE". 

If testing DK board, there are three COM port at one device. Modem trace can work.

However, for my board, it shows two devices. Each one has its COM port. For my case, how to work modem trace?

Thanks for your support.

Q2.

For modem trace COM port, did it have specific baud rate options?

Edit overlay file as below, and then prestine build at VS code.

I found 38400, 115200 and 1000000 are compile successfully.

But, 230400 and 256000 are compile with FATAL error.

&uart1 {
current-speed = <115200>;
};

So, could you provide complete baud rate options for modem trace?

Thanks

Jeff

[Michal]

Hello Jeff,

To my knowledge, modem trace requires 1000000 (1M) baud rate.

If you select your modem UART, then you should be able to select it as your "Modem trace serial port" afterwards in the trace options.

Best regards,

Michal

[Jeffery]

Hi Michal

Q1.

Can I use NRF9160 customer board to run Cellular monitor?

If yes, did you have step-by-step document for customer board? 

How to generate a trace file correctly to you for analyzing LTE issue at board?

Q2.

So, only 1000,000 bps was allowed for modem trace port?

At my customer board, I used a USB-to-RS232 cable between PC and NRF9160 modem trace TXD/RXD.

The max. baud rate of this cable is 256000 bps.

Jeff

[Maria Gilje]

Hi Jeff,

Jeffery said:

Can I use NRF9160 customer board to run Cellular monitor?

If yes, did you have step-by-step document for customer board? 

Yes, but make sure that the board satisfies the minimum requirements for the Cellular monitor and follow the documentation for sending traces over UART on a custom board.

Jeffery said:

How to generate a trace file correctly to you for analyzing LTE issue at board?

Follow the documentation for modem trace with the Cellular monitor found here: https://docs.nordicsemi.com/bundle/nrf-connect-cellularmonitor/page/index.html

Jeffery said:

Q2.

So, only 1000,000 bps was allowed for modem trace port?

At my customer board, I used a USB-to-RS232 cable between PC and NRF9160 modem trace TXD/RXD.

The max. baud rate of this cable is 256000 bps.

When UART is the backend for modem trace, 1 000 000 is the baud rate.

Best regards,

Maria