General Protocol Modbus/TCP, TCP/IP, UDP, HTTP, DHCP, MQTT, SNMP, ASCII command Connectors 2 x RJ45, 1 x 15-pin plug-in screw terminal, 1 x 5-pin plug-in screw terminal
Isolated Digital Input Channels 4 Input Voltage Dry Contact Logic level 1: close to DI COM Logic level 0: open Wet Contact Logic level 1: 10~30 VDC and -10~-30 VDC Logic level 0: -3~3 VDC