... communication interruptionReal-time Clock-Number of Connectable Expansion Modules-COM Port1, RS232 or RS485;Supported working modes: ... Programming, Modbus-RTU (slave), Free protocolEquipment Connected with COM PortRS232/RS485: PC (for programming), third-party HMI ... party serial communication equipment (for example, instruments, bar code reader, etc.)Input Power SupplyAC85~265VSensor Load Power ...