Detection Capabilities: Can detect open or closed contact closure. Provides an OPEN/CLOSED indication in software.
    Maximum measurement rate: one reading every second
    Housing Dimensions: 8 cm (3.1") x 4 cm (1.6") x 2 cm (0.8")
    Housing Material: injection molded ABS thermoplastic
    Housing Colour: light gray
    Communications connector: 8 position modular jack, (accepts 8 position plug RJ45)
    Power source: Port-powered (RTS and DTR, both asserted)
    Power supply current drain: < 10 mA
    Module input: Input amplifier detects resistance across input jack. Resistances from 0 to 15K ohm produce CLOSED condition in software. Resistance above 15K ohm produce OPEN condition in software.
    Input contact connector: 2.1 mm jack
    Operating temperature/humidity range: -40 º C to +60 º C (-40 º F to +140 º F) and < 90% RH (non-condensating) 
    Communications Interface: RS232C using TX,RX,RTS,DTR and GND. One device per serial port.
    Maximum communications cable length: 305 m (1000 ft.) using recommended cable type. Low capacitance shielded cable or UTP is recommended.
    Firmware Version: 2.01
    Communications Protocol: Sensorsoft Device Protocol (SSDP) Version 2.0 and Version 3.0. For software that supports only Version 2 of the protocol a polling method is used. For software that supports Version 3 of the protocol a real-time method is used.
    Error control: 16 bit CRC (cyclic redundancy checking) for detection of communication errors between the device and host computer.