Honeywell IAQPoint2 Technical Manual page 54

IAQPoint2
Holding
Register Bit
Address
b0
b1
b2
b3
b4
b5
b6
b7
40101
b8
b9
b10
b11
b12
b13
b14
b15
40102
40103
40104
40105
40106
40107
40108
40109
40110
40111
40112
52
Modbus Registers
Summary
CO sensor good This is true if the CO
2
VOC sensor good This is true if the VOC sensor is fitted and has no faults.
Heartbeat This bit alternate between true and false every 10 seconds�
Gas Conc low This bit is true if the gas reading is less than the setpoint�
Temp sensor good This bit is true if the temperature sensor is fitted and reading correctly.
Reserved for future enhancements�
Reserved for future enhancements�
Reserved for future enhancements�
Humidity sensor
This bit is true if the humidity sensor is fitted and reading correctly.
good
Reserved for future enhancements�
Reserved for future enhancements�
Reserved for future enhancements�
Occupied Timer This bit is true if the occupied timer inside the IAQPoint2 is running� See
Running Figure 22 for an illustration of this�
Relay Fitted This is true if the PEM backplate contains the optional relay�
Relay Energized This bit is true if the relay is energized�
Reserved for future enhancements�
This reports gas concentration� If the CO
Gas displayed in ppm from 0 to 5000. If the VOC sensor is fitted this will report the air
reading� quality index from 0 to 100� If the gas sensor is faulty this will report
32767�
This reports temperature in tenths of a degree Celcius� (For example,
Temperature C
the temperature of a human body would be reported as 370�) If the tem-
observed
perature sensor is faulty or absent this will contain -2730�
rH reading, Ob- This reports the relative humidity in percent from 0 to 100� If the humidity
served sensor is faulty or absent this will contain -1�
This contains the gas setpoint� The scaling is the same as register
CO /VOC setpoint
2
40102� It is not writable�
Temperature C This contains the temperature setpoint� The scaling is the same as regis-
Setpoint ter 40103� It is not writable�
rH setpoint This contains the relative humidity setpoint� It is not writable�
This counts forever up from 1 to 10000 and then repeats� Some Modbus
Heartbeat
masters may need this to confirm the communication is working.
Reserved for future enhancements�
Reserved for future enhancements�
Writing a 1 to this will cause the "Occupied" icon to appear on the LCD�
Write Occupied Writing anything other than 0 or 1 is illegal� See Figure 22 for an illustra-
tion of this�
Writing a 1 or 0 to this will activate the relay if the correctly configured.
Write Relay Writing anything other than 0 or 1 is illegal� See Figure 22 for an illustra-
tion of this�
Detail
sensor is fitted and has no faults.
2
sensor is fitted this will report
2