Problem setting nrf9160 datamode

[ericlestor]

Hi,

we have a custom board with nrf52840 and nrf9160. NRF9160 has mfw_nrf9160_1.3.3 and serial_lte_modem application. I try to set modem system mode to support both LTE-M and NB-IoT modes with no preference to either with AT command "AT%XSYSTEMMODE=1,1,0,0", but this returns "ERROR". I have set the modem to shutdown state with AT command "AT+CFUN=0".

When I send "AT%XSYSTEMMODE=1,0,0,1" or "AT%XSYSTEMMODE=1,0,0,1" it returns "OK", but it seems that no other combination (at least one with NB-IoT enabled) is working.

How can I set the modem to support both LTE-M and NB-IoT modes without preferring either?

[ericlestor]

Sorry, mistyped the subject, it was supposed to be "system mode" instead of datamode.

[Charlie]

Hi ericlestor,

The command  "AT%XSYSTEMMODE=1,1,0,0" reponse OK on my nRF9160DK.

1) Did you test on an nRF9160DK or Thingy91 board?

2) nRF9160 has three variants, only CA support both LTE-M and NB-IoT. Did your customer board use AA of nRF9160? See infocenter.nordicsemi.com/.../ordering_info.html

Best regards,

Charlie

[ericlestor]

1) Works on nRF9160DK

2) This is the nRF9160 modem on our board

 

It says: nRF9160 SIAA B1 2130AC, I suppose it is LTE-M only product?