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Operating and Maintenance Instructions
Appendix E – Modbus Holding Registers for Configuration & Control
The values changed here are saved in non-volatile memory unless stated otherwise.
ADDR
(hex)
10
11
12
13
14
15
16
17
* (1) The Target Volume/Pressure is a 32-bit unsigned integer: the high value represents the higher 16-bits and the low
value represents the lower 16-bits (2) For a Constant Pressure system whose measurement unit is set to IMPERIAL, the target
pressure setpoint entered here will be the pressure in inch of water times 1000 e.g. for a setpoint of 4.018 inch of water, write 0 to
the HIGH register and 4018 to the LOW register.
** Only applicable when using more than one sensor. The total volume/pressure of the system will be derived according to the
NOTE: Do not to read/write more than 14 consecutive registers at a time, otherwise a Modbus
210-OMI14229-Iss8.1
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DESCRIPTION (Locally Stored Registers)
0
Save Modbus Control Speed Setpoint – 10,000 total write cycle
1
limit (See Caution on the next page)
2
Controller's 0-10V Input Control Mode Enable/Disable
3
Keypad Control Mode Enable/Disable
4
5
6
7
8
9
Volume/Pressure Alarm Enable/Disable
A
Volume/Pressure Alarm Threshold
B
External Pressure Sensor Monitoring Enable/Disable
C
Constant System Type (Pressure or Volume)
D
Measurement Unit (Metric or Imperial)
E
Sensor Type (50Pa, 200Pa, 500Pa, 1000Pa, 2000Pa or 3500Pa)
F
Target Volume/Pressure Setpoint High *
Target Volume/Pressure Setpoint Low *
Sensor Reading Method (Average, Minimum, Maximum or Sum) **
Table 7 – Controller's Dedicated Modbus Holding Registers Part 1
reading method specified on this register.
Exception Response will occur
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Operating Mode
Fan Array Set Speed Register
Menu Lock Enable/Disable
Fan Array Custom RPM Limit
Fan Array Maximum RPM Limit
Alarm Output Mode
Fan k-Factor
PID P Value
PID I Value
PID D Value
Sensor Input (Controller or Fan)
Number of Sensors
CN1116 Full OMI
Page 33 of 47
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