Main features：
>Support mobile EC20 / ec200t-lte module 2g 3g 4G dial-up Internet access；
>Support dual network port 1wan + 1lan or 2lan mode, can be selected throughthe page, support WAN port connec
tion to the external network;
>Support WiFi sta mode, can choose to use STA to connect the superior routeto connect to the external network;
>The system supports serial data transparent transmission mode by default,and supports server type TCP / mqtt board side as client side;
>Support RS232 / RS485 working mode, optional;
>Support RS485 working mode to select transmission direction automatically;
>It supports wide power input dc9-36v, and ultra-low energy consumption isonly 2W;
>Board level built-in multi-level anti surge protection circuit, isolationcircuit;
>Industrial grade stable SIM card holder;
>The system supports RS232 / RS485 data transparent transmission mode bydefault, and supports server type TCP / mqtt, and the board side is clientside;
>It can provide IO pin using block diagram, users can program and writeRS232 / RS485 data, and develop transmission protocol or firmware bythemselves;
