... MODBUS-RTU protocol, realize remote communication;4.Four digital inputs to monitor and control the switch state;5 ... LED Display Frequency40-60Hz, 0.2 class accuracy Digital Input4 digital inputs ,passive dry contact node, R<500Ω ... ,DC5A/30V resistiveCommunication InterfaceRS-485 interface, MODBUS-RTU protocolInsulation≥100MΩInsulation Ω2kv/50Hz/1minOperating ConditionEnvironment Temperature: -10-55 ...