AT Command to enable/disable HW Flow Control on nRF9151

RE: AT Command to enable/disable HW Flow Control on nRF9151

Mariano Goluboff — Tue, 10 Mar 2026 15:57:11 GMT

The Serial Modem add-on doesn't support the AT+IFC command. You would need to add it to the application to be able to change the hardware flow control at runtime.

You can try this fork of the Serial Modem add-on to see if it works for you:

https://github.com/mgolu/ncs-serial-modem/tree/add_at_ifc_command

Mariano

RE: AT Command to enable/disable HW Flow Control on nRF9151

TuanTNguyen — Fri, 06 Mar 2026 14:29:24 GMT

Hello,

Yes, we are using UART. CTS/RTS are at P0.27 and P0.28, respectively. In our case, we plan to test the RTS/CTS signals themselves during production. Is there a way to enable/disable them on the fly without changing the FW?

Thanks.

RE: AT Command to enable/disable HW Flow Control on nRF9151

Menon — Fri, 06 Mar 2026 10:04:50 GMT

Hello,

The AT command AT+IFC is not supported on the nRF9151, so there isn’t an AT command available to enable or disable hardware flow control (RTS/CTS). Are you using the Serial LTE, or a custom application on the device? What is the specific reason you need to enable or disable RTS/CTS hardware flow control?
Could you share some more details on your use case?

Kind Regards,

Abhijith