Pinouts

Pinouts of key ICs for reference:

See below for links to Datasheets.

• ESP32-VROOM-32E
• SIM7070E

Datasheets

• ESP32-VROOM-32E
• SIM7070E
• AT Command Guide

PCB

RS-232 D9 (male) plug is only connected to Teltonika on pins 2,3 and 5, ie TX, RC and GND. Pin 1 DCD is connected via R8 to ESP pin 7 (IO35). NB Pin 2 is connect to Pin 3 on the Teltonika and Pin 3 to 2.