Variable air volume controllers
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59
Modbus register description
Register 1: Setpoint
Setpoint for actuator setting or volumetric flow in hundredths of one percent,
i.e. 0…10 000 corresponds to 0…100%
Register 2: Override control
Overriding the setpoint with defined values
Override control
0 None
1 Open
2 Close
3 Min
5 Max
Register 3: Command
Initiation of actuator functions for service and test; the register is reset automatically.
Command
0 None
1 Adaption
2 Test run
3 Synchronisation
4 Reset actuator malfunctions
Register 4: Actuator type
Actuator type; the allocation may deviate from the basic category with some actuators.
Actuator type
0 Actuator not connected / not known
1 Air/water actuators with/without safety function
2 Volumetric flow controller VAV / EPIV
3 Fire damper actuator
Register 5: Relative position
Relative position in hundredths of one percent,
i.e. 0 … 10 000 correspond to 0 … 100%
Register 6: Absolute position
Absolute position
0 … 10 000 (65535 if not supported by the actuator)
The unit depends on the device:
[°] for actuators with rotary movement
[mm] for actuators with linear movement
Register 7: Relative volumetric flow
Relative volumetric flow in hundredths of one percent of Vnom,
i.e. 0 … 10 000 correspond to 0 … 100%
This value is available only for VAV controllers and EPIV devices (actuator type: 2).
For all other types, 65535 will be entered.
Register 8: Absolute volumetric flow
Absolute volumetric flow
This value is available only for VAV controllers and EPIV devices (actuator type: 2).
For all other types, 65535 will be entered.
The unit depends on the device:
[m 3 /h] for VAV controllers (or [Pa] for pressure applications)
[l/min] for EPIV devices
Register 9: Sensor value
Current sensor value; dependent on the setting in Register 108
The unit depends on the sensor type: [mv] [Ω] [-]
Register 101, 103: Series number
Each MP node has an unambiguous series number which is either impressed on or glued
to the node. The series number consists of 4 segments, although only parts 1, 2 and 4 are
displayed on Modbus.
Example: 00839-31324-064-008
Register 9
Register 10
Register 11
1st part
2nd part
4th part
00839
31234
008
Register 104: Firmware Version
Firmware version of Modbus module (VX.XX)
e.g. 101 V1.01
