nRF9151 supported AT commands

[Jamal_nRF]

Dear Customer Support,

We are gathering the list of supported AT commands support for the nRF9151

Also experimenting available AT commands using the nRF9151DK

So far, we have found two documents:

nRF91 AT Commands - Command Reference Guide v0.7

nRF91x1 Cellular AT Commands - Command reference Guide v1.3

Could you please confirm we are using the latest version for these pdf documents?

Also please let us know if we are missing other AT command documents relevant to the nRF9151

Thank you

Jamal

PS

couple AT command examples we could not find are ATE0 and ATV0

are these no longer supported on the nRF9151?

[Benjamin]

Hi Jamal,

The AT commands are documented in the following guides:

• Modem-specific AT commands - nRF91x1 AT Commands Reference Guide

• Proprietary AT commands - SLM-specific AT commands

This is the newest and official documentation and should include all supported AT Commands.

We don't have AT commands for ATE0 and ATV0.

Best regards,
Benjamin

[Jamal_nRF]

Hi Benjamin,

Thank you for the links and the confirmation on ATE0 / ATV0

How about AT+IPR? Could you please confirm not supported as well?

What would the default baud rate between the MCU and the integrated modem?

Best regards,

[Benjamin]

Hi Jamal,
If you’re referring to communication between the modem and the application core, the modem library handles this through the RPC library, using the IPC peripheral and a shared RAM region.

Or are you asking about using the nRF9151 as a standalone modem communicating with an external MCU?

Benjamin

[Jamal_nRF]

Hi Benjamin,

Thank you for clarifying the communication between the modem and the application core.

Found the associated block diagram in the documentation

My application use case is rather the latter, communicating over UART to an external processor, using the SLM Application as a starting baseline.

The baud rate in this case is covered by the .overlay configuration

[Benjamin]

Great!
Yes, the baud rate is now set in the device tree. Previously there was an AT command (#XSLMUART) for it, but it has been removed as of NCS v2.5.0.

[Jamal_nRF]

Hi Benjamin,

Thanks for the confirmation.

Currently using the SDK version  V3.0.2

Follow up question:

Looking for Production Test command 11.1 RX test %XRFTEST described in the manual section 11

Apparently it is available in the PTI image as documented here

https://www.nordicsemi.com/Products/nRF9151/Download?lang=en#infotabs

Able to download the corresponding zip file mfw-pti_nrf91x1_2.3.6

Question: which image (.ex file) to use to program and test the PRI application on the nRF9151DK?

Thank you

[Benjamin]

Hi Jamal,
In nRF Connect for Desktop, open the Programmer and upload the entire zip file. The tool will handle the rest.

Add File → Write

[Jamal_nRF]

Hi Benjamin,

I used the Desktop to write/program the PTI mfw-pti_nrf91x1_2.3.6.

Works fine.

I realized it's a modem firmware

Trying to figure out where to send AT commands from? (AT%XRFTEST in particular)

Able to open a com port from the Desktop terminal. Only shell commands are available, but no AT support.

1. which application to use for the MCU that works with this modem 2.3.6 image?

2. is the source code for AT%XRFTEST available somewhere?

3. would it make sense to try to integrate this command on the MCU application? for example within the Serial LTE Modem application?

Reason is to avoid programming the modem firmware back and forth between 2.0.2 and 2.3.6 during our device production

4. additional question: which version is programmed on the nRF9151 SiP when they ship from Nordic? Assuming it would be the latest 2.0.2, but please confirm

Thank you