I think you cumulate all the errors that I solve previously:
- Avoid Node MCU because voltage level are 3V3 whereas PZEM expects 5V. It could work but it's not sure
- Avoid HW serial
- RX and TX are inverted to work with HW serial
- Deactivate serial communication in Tools->Advanced-> Serial Port
So follow very carefully this link, and normally everything should be OK. If not, use a wemos D1.