nRF9160 DK UART Connection with External MCU

[Hamza_HK]

Hi, 

we have a nRF9160 DK where we have uploaded the AT_CLIENT example on. Have tested the board and it works fine, able to send AT Commands and join to the network etc...
Now we want to communicate with the nrf9160 modem through UART with an external MCU.

How can we connect the external MCU with the nrf9160 board through UART?

We have looked through the forum and the user manual but we were not successful with achieving our goal. We have also tried this example to establish serial communication with the nrf9160. 

The external MCU is a nrf52840. 

Would appreciate any help! 


Best Regards,
Hamza

[Sigurd]

Hi,

We have looked through the forum and the user manual but we were not successful with achieving our goal.

How can we connect the external MCU with the nrf9160 board through UART?

 What are you planning to send over the UART? Are you planning to send AT commands, and control the modem on the nRF9160 using the nR52840? I.e. use the nRF9160 as a Serial LTE modem? or are you planning something else?

What nRF52840 board are you using ? Do you have a custom board with a nRF52840, a nRF52840-DK, or are you using the on-board nRF52840 on the nRF9160DK?

Is your nRF52840 application based on nRF5 SDK or NCS(nRF Connect SDK)?

What pins on the nRF9160DK did you use for the UART ? Can you describe how you connected the nRF52840 and nRF9160DK?

BR,

Sigurd