Murata Kit (LBAD0XX1SC-DM-EVK2) unresponsive to AT Commands or extremely slow

Hardware
1

I’m trying to get the Murata NTN kit up and running, but I’m having issues sending AT commands to the module.

The module receives serial input, but only infrequently. It seems like the module is only responsive every ±second, for a duration of a few milliseconds. In between these responsive windows, the module is unresponsive.

I’ve tried different baud rates, connecting 1 or both serial cables to power. Nothing seems to change this behavior. Below an impression of the speed:

AT-issue

With some patience I did manage to send some AT commands. The following commands returned ERRORs:

AT%GETCFG="SIM_INIT_SELECT_POLICY"
ERROR

AT%GETCFG="SIM_INIT_SELECT_POLICY","0"                                          
ERROR

Any thoughts?

2

After some trial and error, I managed to make it work.

If you press and hold on the three buttons (see img below), you can send AT commands (make sure to keep the button pressed).

image
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