Compact controller XM0 for TVE and TVE-Q

Bus interface Modbus RTU


Control component for type TVE

VAV control unit variant TVE-Q-P1 (powder-coated)

Control component for type TVE-Q

Control component for type TVE-Q



Control component with dynamic transducer and Modbus RTU interface

Compact unit for VAV control unit TVE and TVE-Q

  • Controller, dynamic effective pressure transducer and actuator in one casing
  • Use in ventilation and air conditioning systems, only with clean air
  • Simple terminal connection, no connection box required
  • Volume flow rates qvmin and qvmax factory preset and stored in the controller as variable parameters
  • High data transparency through standardised bus communication Modbus RTU, RS485
  • Setpoint presets, override controls, parameter adjustment via Modbus registers
  • Integrated display for volume flow rate display, operating status display and setting of operating parameters
  • Service access for manual adjustment devices and PC configuration software

General information


  • Complete control unit for VAV terminal units type TVE and TVE-Q
  • Dynamic effective pressure transducer, electronic controller and actuator are fitted together in one casing
  • For clean air in ventilation and air conditioning systems
  • The standard filtration enables use in the supply air without additional dust protection measures
  • Application examples: Offices and classrooms
  • In the event of a strong occurrence of dust, install appropriate exhaust air filters upstream, as a partial volume flow is routed through the transducer for volume flow rate measurement.
  • If the air is heavily contaminated with dust, fluff, sticky, moist components, an attachment with a static differential pressure transmitter must be used, e.g. XS0
  • Application examples: Exhaust air from changing rooms and shower areas, hospital bed rooms
  • Various control options based on setpoint value default setting
  • Volume flow rate control is based on setpoint values received from room temperature controller, MCE, air quality controller or other devices as an analogue signal or via communication interface
  • Override controls for activating qvmin, qvmax, shut-off, open position via Modbus register or switch or relay possible
  • The actual volume flow rate is available as a network data point or as a linear voltage signal
  • Damper position, e.g. for fan optimisation, is available as a network data point

Control strategy

  • The volume flow controller works independent of the duct pressure
  • Pressure fluctuations do not result in permanent volume flow rate changes
  • To prevent the control from becoming unstable, a dead band (hysteresis) is allowed within which the damper blade does not move.
  • Flow rate range in the controller set in the factory (qvmin: minimum volume flow rate, qvmax: maximum volume flow rate)
  • Operating parameters are specified via the order code and set in the factory

Operating modes

  • Modbus (M): Setpoint specification via Modbus registers
  • Analogue - variable operation (V): Setpoint input via analogue interface, signal voltage range corresponds to qvmin to qvmax

  • Analogue - fixed value operation (F): no setpoint signal required, setpoint corresponds to qvmin


Communication interface

  • Modbus RTU, RS485
  • Data points see Modbus register list

Analogue interface with adjustable signal voltage range

  • Analogue signal for volume flow setpoint
  • Analogue signal for actual volume flow rate (factory setting)
  • Alternatively: analogue signal for damper position (on-site conversion required)


  • Interface type preset at the factory according to operating mode
  • Can be adapted on site via communication interface (Modbus register) or display operation.

Signal voltage ranges

When using the analogue interface

  • 0 – 10 V DC
  • 2 – 10 V DC

Parts and characteristics

  • Transducer for dynamic measurement principle
  • Overload protection
  • Terminals with cover
  • Display and control elements for simple menu guidance
  • Menu guidance for adjusting operating parameters and communication interface
  • Service interface


  • TR0VM-024T-10I-DD15-MB

  • Can only be used for type TVE and TVE-Q


  • Due to the volume flow rates set in the factory, always ensure that the control units are only installed in the specified locations
  • Analogue interface: ready for use after installation and wiring
  • Modbus interface: additional commissioning steps required
  • Operating parameters can be adjusted by the customer (using the display panel, adjustment device or Modbus register)

Useful additions

  • Adjustment device type GUIV3-M  (order code AT-VAV-G3)

Technical information

Function, Specification text, Order code

  • Function

1 Differential pressure transducer
2 Actuator
3 Volume flow controller
4 Setpoint value via BACnet, Modbus or analogue signal
5 Shaft with effective pressure channel

VAV terminal units control the volume flow in a closed loop, i.e. measurement – comparison – correction.
For volume flow rate measurement the effective pressure is measured first. This is done with a differential pressure sensor. The integral differential pressure transducer transforms the effective pressure into a voltage signal. The actual volume flow rate is available as a voltage signal. The factory setting is such that 10 V DC always corresponds to the nominal flow rate (qvnom).
The volume flow rate setpoint value comes from a higher-level controller (e.g. room temperature controller, air quality controller, central BMS). Variable volume flow control results in a value between qvmin and qvmax. It is possible to override the room temperature control, e.g. by a complete shut-off of the duct.
The controller compares the differential pressure setpoint value to the actual value and controls the actuator accordingly if there is a difference.


  • Compact controller for volume flow rate
  • Control of a constant or variable volume flow rate setpoint
  • Electronic controller for the connection of a reference variable and tapping of an actual value for integration into a Modbus-based building management system
  • The actual value relates to the nominal volume flow rate so that commissioning and subsequent adjustment are simplified


  • Dynamic transducer for clean air in ventilation and air conditioning systems
  • Modbus commands (Modbus operating mode)
  • External switching contacts/wiring (with analogue interface)

Supply voltage

  • 24 V AC/DC


  • Integrated; slow-running (running time 100 s for 90°)

Installation orientation

  • Either direction


  • Modbus RTU (RS-485) or alternative analogue signals (0 – 10V or 2 – 10V DC) can be used
  • Interface type preset in the factory on the basis of the order code


  • Terminals with cover by rubber cap, therefore no additional terminal box required
  • Double terminal for supply voltage for easy further wiring of up to 3 controllers

Interface information

  • Modbus: among other things, volume flow setpoint and actual value signal, damper position, override control
  • Alternative: Volume flow setpoint and actual value signal as analogue signal

Special functions

  • Clearly visible external indicator light for signalling the functions: Set, not set, and power failure
  • Display for actual values, parameterisation and for test functions
  • Activation qvmin, qvmax, closed, open by: Modbus (with Modbus control), external switch contacts (with analogue control)

Parameter setting

  • Parameters specific to VAV terminal unit set at the factory
  • Operating values: qvmin, qvmax and interface type set in the factory
  • Subsequent adjustment via display and control element directly on the device or with optional tools: adjustment device, PC software (wired in each case), in Modbus mode as well as via Modbus register access

Factory condition

  • Electronic controller factory set on control unit
  • Factory setting of parameters
  • Functional test under air; certified with sticker

TVED / 200 / D2 / XM0 / V0 / 100500m³/h
1 Type
TVE VAV terminal unit
2 Acoustic cladding

No entry: none
D With acoustic cladding
3 Material
Galvanised sheet steel (standard construction)
P1 Powder-coated RAL 7001, silver grey
A2 Stainless steel construction
5 Nominal size [mm]
100, 125, 160, 200, 250, 315, 400
Accessories 6
No entry: none
D2 Double lip seal both ends
G2 Matching flanges for both ends

7 Attachments (control component)
XM0 Compact controller dynamic transmitter, Modbus RTU, display
8 Operating mode
F Constant value (one setpoint value)
V Variable (setpoint value range)
M Modbus RTU
9 Signal voltage range (only with operating mode F, V)
0 0 – 10 V DC
2 2 – 10 V DC
10 Operating values for factory setting
Volume flow rates in m³/h or l/s
qvconst (only with operating mode F)
qvmin (only with operating mode V, M)
qvmax (only with operating mode V, M)
11 Volume flow rate unit
Order example: TVE/100/D2/XM0/M/20-350 m³/h
Acoustic claddingWithout
MaterialGalvanised sheet steel
Nominal size100 mm
AccessoriesDouble lip seal both sides
AttachmentCompact controller Modbus, dynamic transducer
Operating modeModbus RTU
Volume flow rate20 – 350 m³/h



Technical data

  • Technical data
Compact controller XM0 for TVE and TVE-Q XM0_mit_Kappe_querpsd.png

Compact controller for VAV terminal units

Part number

Type of installation componentVAV terminal units
A00000069230TR0VM-024T-05I-DD15-MBTVE, TVE-Q


Type of measurement/installation orientationDynamic measurements, any installation orientation
Supply voltage (AC)24 V AC, ± 20 %, 50/60 Hz
Supply voltage (DC)24 V DC ± 20 %
Power rating (AC)TVE NW 100 - 160: maximum 4 VA
TVE NW 200 - 400: maximum 7 VA
TVE-Q up to height 200: maximum 4 VA
TVE-Q from height 300: maximum 7 VA
Power rating (DC)TVE NW 100 - 160: maximum 2.5 W
TVE NW 200 - 400: maximum 4 W
TVE-Q up to height 200: maximum 2.5 W
TVE-Q from height 300: maximum 4 W
Power consumption (when running/when idle)

1 W

Setpoint value signal input (analogue optional)0 - 10 V DC, input resistance > 100 kΩ
or 2 - 10V DC Ra> 50 kΩ
Actual value signal output

0 - 10 V DC or 2 - 10 V DC; maximum 5 mA

IEC protection classIII (Protective extra-low voltage)
Protection levelIP 42 (with attached terminal cover)
EC conformityEMC to 2014/30/EU
Bus connectionModbus RTU, RS485
Number of nodes128
Adjustable communication parameters1200 – 115,200 Bd
Start bit: 1
Data bits: 8
Stop bits: 1 or 2
Parity: None, Even, Odd
Setpoint / actual value interface (Modbus)via Modbus register list
Cable terminationexternally required

Interface configuration of the control component

Depending on the setting, the Modbus communication interface or the analogue interface for the setpoint value specification of volume flows are available here. The so-called interface mode is preset at the factory according to the order key and can be adjusted on site by setting via the menu navigation or the Modbus registers.

Typical interface configuration

Setpoint value default setting via:Actual values via:corresponds to order key optionMenu configuration (Mode)
Analogue operationanalogue 0 - 10 Vanalogue 0 - 10 VV or FCA0
Analogue operationanalogue 2 - 10 Vanalogue 2 - 10 VV or FCA2
Modbus operationModbus register setpointModbus register actual value or analogue 2 - 10 VMCB

By special configuration of the Modbus register Interface-Mode, mixed operations of Modbus operation and analogue operation can be configured. See the description of the interface mode in Modbus register 122.

Supplementary use of the Modbus interface in analogue mode

In analogue mode, only the setpoints at the analogue input are evaluated by the controller. A setpoint specification via the Modbus interface (register 0) is not possible. Any write attempts are acknowledged with an error response. Regardless of the selected interface configuration, however, the other Modbus registers can be used. In this way, the operating values of the actual volume flow rate and damper position can be read out from a higher-level management and control equipment (MCE), with local control using an analogue signal via a connected Modbus. Central override controls can also be triggered.

Communication interface Modbus RTU (operating mode M)


MeaningAccess rightStorage


Volume flow setpoint [%]
Reference: Vmin – Vmax (qvmin – qvmax)
Resolution: 0 – 10000
Volume flow setpoint: 0.00 - 100.00%
1Activation of an override control; 0 = none; 1 = Open; 2 = Close; 3 = Vmin; 4 = VmaxR, WRAM
2Command triggering 0 = none; 1 = adaptation; 2 = test run; 4 = controller resetR, WRAM
4Current damper blade position [%]
Resolution: 0 – 10000
Damper blade position: 0.00 – 100.00%
5Current damper blade position [°]
Reference: without decimal places
6Current actual volume flow [%]
Resolution: Vnom
Resolution: 0 – 10000
Actual volume flow rate: 0.00 - 100.00%
7Actual volume flow rate in volume flow rate unit [m³/h], [l/s], [cfm] according to register 201RRAM
8Voltage at analogue input Y [mV]RRAM
103Firmware versionR


104Status information
Bit 5 mechanical overload
Bit 8 internal activity e.g. test run, adaptation
Bit 10 bus timeout monitoring triggered
105Operating range limitation: Operating parameter Vmin (qvmin) [%]
Resolution: Vnom
Resolution: 0 – 10000
Vmin: 0.00 – 100.00%
106Operating range limitation: Operating parameter Vmax (qvmax) [%]
Resolution: Vnom
Resolution: 0 – 10000
Vmax: 0.00 – 100.00%
108Behaviour on bus failure (bus time-out); 0 = nothing; 1 = closed; 2 = open; 3 = qvmin; 5 = qvmaxR, WEEPROM
109Setting bus time-out [s]R, WEEPROM
120Definition of operating range: operating parameters Vmin (qvmin) in volume flow rate unit [m³/h], [l/s], [cfm] according to register 201R, WEEPROM
121Definition of operating range: operating parameters Vmax (qvmax) in volume flow rate unit [m³/h], [l/s], [cfm] according to register 201R, WEEPROM
122Interface definition (Interface mode) For assignment see separate tableR, WEEPROM

130 *

Modbus address (device address)R, WEEPROM
201Volume flow rate unit 0 = l/s; 1 = m³/h; 6 = cfmR, WEEPROM
231Setting of mode:
Bit 0 defines the characteristic of the analogue interface.
Bit 0 = 0 characteristic: 0 – 10 V
Bit 0 = 1 characteristic: 2 – 10 V
Bit 4 defines the actual value signal as actual volume flow rate or damper position.
Bit 4 = 0 Actual volume flow rate
Bit 4 = 1 Damper blade position
All other bits must not be changed.


Nominal flow rate [m3/h] (Vnom):
Displays the parameterised nominal volume flow rate




Modbus parameter kit communication settings: baud rate, parity, stop bits, assignment see separate table

569Modbus communication settings: Modbus Response Time = 10 ms + delay; with delay= 3 ms × register value 0 - 255R, WEEPROM
572Setting of switching threshold for override control CLOSE via control signal for signal voltage range 2 – 10 V:
Setting range 0.5 V – 1.8 V
Default value 0.8V (register value = 20)
Resolution: 1 setting unit = 40mV

* Factory setting: Modbus address 1

R = register readable

R,W = register readable and writeable

RAM = register value volatile

EEPROM = register value not volatile, but permanently stored (maximum 1 million write operations)


All registers from register number 100 with storage in the EEPROM are not designed for cyclical write access, e.g. by the building management system. Cyclic write operations are only permitted on registers with storage in RAM.

Detailed information on register 122 (communication interface setpoint/actual value - interface mode)

Communication interface/Interface mode


Register value

Signal inputFeedback signalRAM


analogue (0) 2 - 10 V(0)2 – 10 VRAM
1Modbus via Register 0(0)2 – 10 VRAM
2Modbus via Register 0Register 10RAM
3analogue (0) 2 - 10 VRegister 10RAM

Detailed information on register 568 (Modbus communication parameters)

Register valueDisplay setting valueBaud rateParityStop bits



15 **






** Factory setting: Modbus communication parameters

After installation, wiring and connection of the supply voltage

  • When using the Modbus interface: Set Modbus communication parameters via the integrated menu, then the air terminal unit is ready for operation
  • Setpoint value default setting via Modbus register
  • When using the analogue interface: air terminal unit is immediately ready for use
  • Remove terminal cover of the control component only for wiring

Observe volume flow control ranges

  • TVE: 4 - 100 % of qvnom
  • TVE-Q: 10 - 100 % of qvnom
  • In particular, do not set values below the minimum volume flow of the control unit

Range of display functions

Display functions

  • Actual volume flow rate (unit optionally m³/h, l/s, cfm)
  • 3-character display with place value indication
  • Status and error display for various operating states, including display of activated override control and diagnosis function

Parameter settings

  • Adjustment option for the unit of the volume flow rate display m³/h, l/s, cfm
  • Adjustment option for the operating range qvmin, qvmax
  • Selection of the interface configuration Modbus or analogue, including signal voltage range 0 - 10 V or 2 - 10 V DC. For the variant with RJ12 connection socket, only the interface configuration Modbus is suitable
  • Setting option for Modbus communication settings (address, baud rate, stop bits, parity)

Diagnostic functions

  • Activation of a test run
  • Activation of override controls Open, Closed, qvmin, qvmax, motor stop (observe prioritisation)
  • Display of the voltage value on the analogue input

Use and description of the display

Pressing the LED button (< 3 s) selects the next menu item (1) - (6). The selected menu item can be changed by pressing the LED push button for more than 3 s. Changing is done with the rotary selector switch. Pressing the LED push button again (< 3 s) confirms the selected value. If no entry is made for ≥ 60 s, the system returns to menu item 1.

Table 1: Description of the menu items

① FlowDisplay of actual values or operating states. Setting of the volume flow unit m³/h, l/s, cfm.
② VminSetting qvmin
③ VmaxSetting qvmax


Display of control signal and feedback signal alternately in [V],
Activation of override controls for test and diagnostic purposes:
tst = test drive
oP = damper open
cL = damper closed
Lo = qvmin
Hi = qvmax
St = motor stop
oFF = override control off
000 = Display firmware version


Selection of the operating mode:
CA0 = Setpoint input and actual value return via analogue interface (0 - 10 V)
CA2 = Setpoint input and actual value return via analogue interface (2 - 10 V)
CB2 = Setpoint input and actual value return via Modbus - optional actual value return via (2 - 10 V)


Setting the Modbus address: 1 - 247

and the baud rate, parity, stop bits: 1 (b1) - 32 (b32)

Note on MODE setting:
For the control component XM0-J6 or XS0-J6, only the mode setting CB2 is useful, as setpoint input and actual value return as analogue signal are not available on the RJ12 connection socket of these control components.

Description of status LEDs and error messages

LED flashing signalStatusDisplay

no power supply connected

Service tool plugged in.
On-site network connection deactivated.
Forced controls from the service tool have priority

Undervoltage detected.
Supply voltage outside the tolerance range.
Control function not guaranteed

TROX service technicians provide information.
Incomplete parameterisation was detected during power-on/reset *

Drive overload detected (block) *

Synchronisation drive after Power Up *

Test mode enabled *

Overpressure sensor (Overpressure) *

Setpoint or forced control position not yet reached (display changes between e.g. Hi = high and actual value) *

Forced control position reached
(display changes between e.g. Hi = High and actual value) *

Offset: Is signalled as long as the drive does not rotate to readjust the setpoint value *


  1. The signal spans 2 seconds. 1 = LED is illuminated, 0 = LED is not illuminated
  2. For service tool plugged in (display: Pc) and undervoltage detected (display: Lou), no special flashing signal appears on the LED button. Instead, one of the operating states marked with an asterisk (*) is displayed.


product information


operation manuals

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