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Roomstat 3X IOB
I/O Bus Room Sensor

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The Roomstat 3X IOB is a I/O Bus room sensor that combines a high accuracy temperature sensors with global system access for any operator with a portable computer.  I/O Bus capabilities allow you to multi drop up to 24 Roomstats on one I/O Bus.

Roomstat 3X IOB models offer combinations of setpoint adjust and LED override indication.


  • room temperature sensing
  • setpoint adjust
  • LED override indication
  • connect to any SAC


  • I/O Bus allows up to 24 Roomstats to be connected to any single SAC


  • Roomstat 30, basic temperature sensor
  • Roomstat 31S, setpoint adjust/temperature
  • Roomstat 32, setpoint, temperature, override


  • 3k thermistor
  • 0.2C accuracy


  • 2 wire terminal for I/O Bus


  • powered directly from the I/O Bus

Communication Protocol

  • Walker ASCII Protocol


  • 18 AWG twisted shielded pair
  • I/O Bus
  • maximum length 1000 feet

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Left click to view with Acrobat Reader Right click & "Save Target As..." to download PDF file: RmStat IOB.pdf

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