MVA008 Radio communication profile A5-20-01

The wireless communication is cyclical and bidirectional using only the EnOcean Equipment Profile EEP A5 20-01 (Battery-Powered Actuator).

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Protocol data overview

*1 IMPORTANT NOTICE:

When operated in Temperature setpoint mode (SPS=1), every valid temperature setpoint (°C) value received is internally stored and used in case of radio loss situations. This allows the user to control the radio loss safety temperature value even when the device is used in valve position mode SPS=0.

More information is available in the latest release version of the published equipment profiles EEP of the EnOcean Alliance. http://www.enocean-alliance.org

Setpoint Selection (DB1.2, RCU to MVA004)

Selection whether A5-20-01 and the actuator is used with Valve Position (Controller running in the room or building control system) or with its internal temperature control loop.

Valve position [%] and Set temperature [°C] in actuator mode (DB3, RCU to MVA004)

The external radio partner transmits the temperature setpoint for the internal controller (0 ... + 40°C, DB3.7 ... DB3.0 = 0 ... 255). The use of a separate, external room temperature sensor is recommended whose room temperature (DB2.7 ... DB2.0) is transmitted to the drive by the room controller as part of the A5-20-01 protocol. The internal controller thus does not use the ambient temperature measured in the near field of the radiator, but the actual room temperature.

When operating with an internal temperature sensor, DB2.7 ... DB2.0 must be set to 0x00. Values not equal to 0x00 are interpreted as sent room temperatures and thus lead to faulty control behavior.

Valve position (%):The external radio partner transmits a 0 ... 100% control signal (DB3.7 ... DB3.0 = 0 ... 100) and converts it into an actuating movement by the actuator (0% = closed valve / 100% = completely open valve).

Summer Mode (DB1.3)

When the actuator receives the status message „Summer mode ON“ from the external radio master, then the transmit/receive interval is increased from 2/5/10 minutes to 8 hours. It is possible to wake up the iTRV through 1 x pressing the push button. Then the iTRV receives the new setting from the room controller.

Recognition of valve position and reference run

The valve actuator recognizes during the teach-in the closing position of the valve. During operation the valve actuator does a full stroke (self-calibration) after every 2^nd week, to avoid malfunction of the valve. It is not intended to trigger the recognition of the valve position via room controller.

Example of a radio protocol

Radio protocol of valve actuator MVA to server /controller /gateway

Example in HEX "0x32 0x70 0x89 0x08"

• DB3.7…DB3.0 = 0x32 = 50: valve position is 50%

• DB2.7…DB2.0 = 0x70 includes

o    DB2.4 = 1 Energy storage capacity sufficient

o    DB2.5 = 1 Energy storage charged

o    DB2.6 = 1 Harvesting active

• DB1.7…DB1.0 = 0x89 = 137: Internal temperature = 40*DB.1/255 = 40*137/255 = 21,5 °C

• DB0.7…DB0.0 = 0x08: Data telegram

 Radio protocol from server /controller /gateway to valve actuator

 VALVE POS: Example in HEX "0x05 0x77 0x00 0x08"

• DB3.7…DB3.0 = 0x05 = 5: new valve position is 5%

• DB2.7…DB2.0 = 0x77 = 119: room temperature = 255 - 119 = 136 => 40 * 136 / 255 = 21,3 °C

• DB1.7…DB1.0 = 0x00:

o    DB1.3 = 0: regular default radio cycle (no summer mode)

o    DB1.2 = 0: DB3.7…DB3.0 is set to valve position %

• DB0.7…DB0.0 = 0x08: Data telegram

SET_TEMP: Example in HEX "0x80 0x81 0x04 0x08"

• DB3.7…DB3.0 = 0x80 = 128: New target temperature is 40 * 128 / 255 = 20,1°C

• DB2.7…DB2.0 = 0x81 = 129: room temperature = 255 - 129 = 126 => 40 * 126 / 255 = 19,8 °C

• DB1.7…DB1.0 = 0x04:

o    DB1.3 = 0: regular default radio cycle (no summer mode)

o    DB1.2 = 1: DB3.7…DB3.0 is set to internal temp.-controller with default duty cycle (Summer bit not active)

• DB0.7…DB0.0 = 0x08: Data telegram

DIRECTION-1 MVA004 to Control unit /Gateway 

DIRECTION-2 Control unit / Gateway to MVA004