M1200 enables remote data transmission of local serial ports and I/O, and supports such interfaces as RS-232, RS-485 and mini-USB. This dual-SIM gateway provides users with stable network connectivity and data transmission. Auto GSM/GPRS/EDGE/UMTS/WCDMA/HSDPA/HSUPA/HSPA+/FDD LTE/TDD LTE connections (No AT command required). Dual-SIM backup (push-push or MFF type optional). IPsec/OpenVPN/GRE/L2TP/PPTP. Transparent TCP and UDP protocol connections. ICMP, DDNS, SNTP and Telnet. Modbus RTU to TCP. Auto rebooting via SMS and Timer. Configuration and firmware upgrading via USB and RobustLink. Sending SMS if DI is triggered (optional, not included). Robust industrial design (9 to 36V DC, -40 to +75 °C extended operating temperature, desktop or wall mounting or DIN rail mounting).