Operating and Maintenance Instructions
210-OMI14229-Iss8.1
CN1116 Full OMI
Page 33 of 47
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Appendix E
–
Modbus Holding Registers for Configuration & Control
The values changed here are saved in non-volatile memory unless stated otherwise.
ADDR
(hex)
DESCRIPTION (Locally Stored Registers)
0
Operating Mode
1
Save Modbus Control Speed Setpoint
–
10,000 total write cycle
limit (
See Caution on the next page
)
2
Controller’s
0-10V Input Control Mode Enable/Disable
3
Keypad Control Mode Enable/Disable
4
Fan Array Set Speed Register
5
Menu Lock Enable/Disable
6
Fan Array Custom RPM Limit
7
Fan Array Maximum RPM Limit
8
Alarm Output Mode
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
Fan k-Factor
10
Target Volume/Pressure Setpoint High *
11
Target Volume/Pressure Setpoint Low *
12
PID P Value
13
PID I Value
14
PID D Value
15
Sensor Input (Controller or Fan)
16
Sensor Reading Method (Average, Minimum, Maximum or Sum) **
17
Number of Sensors
Table 7
–
Controller’s
Dedicated Modbus Holding Registers Part 1
* (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
reading method specified on this register.
NOTE: Do not to read/write more than 14 consecutive registers at a time, otherwise a Modbus
Exception Response will occur
