Hello @iamjameshannam

do you have a SIM card in your IoT Base CatM module?

I did some testing and from within UiFlow it seems that as part of the module initialization (e.g. catmiot = module.get(module.CATMIOT)) an AT+CPIN? command is sent repeatedly (about every 6 seconds) until the module response is +CPIN: READY. Without SIM card the module response is ERROR which means the program flow is blocked forever.

Thanks
Felix

@thrasher Sorry for my bad writing.
So I want to use 2 piece of PZEM for my project and I test PZEM that connect to UART2 it can send value to monitor with speed 115200 and then I test to PZEM that connect to UART0 it not show any value excpet "NaN" from my monitor. how can I fix this?

@ashwindec11 yes, the motors are 12v and are fed from the 12v side of the LM2596SX, the logic and core are fed from the 5v side of the LM2596SX