Power supply: single DC+9V-24V Interface: DB9 RS232/RS485 GSM all network connectivity Protocol: MODBUS ASCII/RTU, MOTT, TCP/UDP, HTTP master-slave Function: Supports OTA upgrades

Power supply: single DC+9V-24V Interface: DB9 RS232/RS485, LAN RJ45 GSM all network connectivity Protocol: MODBUSTCP/UDP/ASCII/ RTU, MOTT, TCP/UDP, HTTP master-slave Function: Supports OTA upgrades

Power supply: dual DC+9V-24V Interface: RS232/RS485, WLAN, LAN RJ45 WIFL, GSM all network connectivity 1 channel open drain output Protocol: MODBUS TCP/UDP/ ASCII/RTU, MOTT, TCP/UDP, HTTP, SNMP, BACnet, FTP, OBDC, OPCUA can be used as the master/slave station Function: Supports remote upgrade, VPN, and local network serial port