Digital Input Channels 16 Input Type Dry Contact, Source Off Level Close to GND On Level Open Effective Distance 500m max. Counters channels : 16 Max. Counters : 16-bit (65535)  Max. Input Frequency : 100Hz Min. Pulse Width : 5ms Interface Interface RS-485 Format N, 8, 1 Baud Rate 1200 ~ 115200bps LED Display 1 LED as Power/ Communication indicator Power Input 10~30VDC Power Consumption 0.7W Protocol Support Modbus and DCON Protocol Yes Environment Operating Temperature -25 to 75°C Storage Temperature -40 to 85°C Humidity 5 to 95%, non-condensing