Caravan Control Unit Peripheral Devices, Function - GF54.21-D-5045TSA
Model 907
with code JA3 (Intelligent body control.)
General
Negative temperature coefficients (NTC)
Components from other manufacturers are expected to have corresponding physical interfaces if they are to be connected to the MB Advanced Control (N175) control unit.
None of the components exhibit an independent/internal characteristic.
By contrast, for the climate control, the Hydronic, Airtronic and LIN bus heater as well as the LIN bus A/C system components can be connected to the MBAC.
To control the various components, the software of the head unit (A26/17) or the smart phone/tablet app provides corresponding software functions (so-called models).
The MBAC supports the following peripheral devices:
- NTC temperature sensor
- Light control
- Climate control
- Comfort components
- Supply components
NTC temperature sensor
An NTC temperature sensor can be connected to an analog input of the MBAC for measurement of the temperature in the vehicle. The actual measured resolution may be higher or lower.
Light control
High-side lamps can be used as dimmable lights or as individual channels for color temperature or color controllable lights.
"TunableLight", "DimmableLight" or "ColorLight" models can be used here for actuation.
Climate control
The climate control can be mapped for the following components using the "ClimateControl" model:
- "Hydronic"
- "Airtronic"
- LIN bus heater and air conditioning system
- Roof ventilator
"Hydronic"
A "Hydronic" is an integrated device used for control of the temperature in three different areas of the vehicle and for generating hot water.
The "Hydronic" internally regulates measurement of the boiler temperature and opens or closes the relevant signal output.
"Airtronic"
An "AIRtronic" is an integrated device for controlling the ambient temperature.
The "AIRtronic" regulates the temperature to match the control and reference voltage.
LIN bus heater and air conditioning system
A LIN bus heater and LIN bus air conditioning system can be connected for the climate control.
The LIN bus heater and LIN bus air conditioning system automatically control the desired target temperature in each case.
Roof ventilator
A roof ventilator can be actuated by the MBAC to regulate the interior climate.
The driver for a roof ventilator and therefore the roof ventilator itself, do not have independent characteristics.
The "WritableValue" model can be used here for actuation.
Comfort components
The MBAC supports the following comfort components:
- Pop-up roof or sliding sunroof
- Awning
- Satellite system
- Refrigerator
- Refrigerator box
- TV drawer
- Lifting bed
- Slide-out window
Pop-up roof or sliding sunroof
A pop-up roof can be opened upwards for comfort purposes to gain more headroom in the vehicle interior.
The sliding roof is a roof system that can be opened.
As this involves the actuation of motor components, the "MechanicalControl" model is used here.
Awning
An awning can be actuated by a relay where a higher current load is involved.
The "MechanicalControl" model can also be used here for actuation.
Satellite system
A satellite system can be connected to the MBAC for TV reception via satellite.
The MBAC only controls the satellite system here, it does not provide a TV signal.
The satellite system automatically locates the satellites.
The "WritableValue" model is a suitable model here for actuation.
Refrigerator
A refrigerator connected to the MBAC regulates the cooling function.
The "OnOffControl" or "WritableValue" model can be used here, depending on the given scope of functionality.
Refrigerator box
The refrigerator box temperature is regulated in a required range.
This is regulated through the compressor control.
"OnOffControl" is a suitable model here.
TV drawer
A TV drawer can be connected to the MBAC through a relay for retracting and extending.
The "Mechanical Control" model can be used here for actuation.
Lifting bed
A lifting bed can be connected to the MBAC for comfort purposes.
The "Mechanical Control" model can be used here for actuation.
Slide-out window
A slide-out window can be connected to the MBAC for the status request.
The "ReadOnlyValue" can be used here to process the values.
Supply components
The MBAC supports the following supply components:
- 5-bar probe
- Water drain valve
- Water pump
- Gas shutoff valve
- Gas fill level sensor
- Bluetooth® antenna
5-bar probe
A 5-bar probe can be read in by the MBAC over analog inputs, to record the current fill level.
Water drain valve
The MBAC can open and close a connected water drain valve.
Water pump
The MBAC can activate a water pump for regulating the water tank fill level.
Gas shutoff valve
Pulse width modulation (PWM)
A gas shutoff valve can be connected to the MBAC to regulate the supply of gas.
The gas shutoff valve can be actuated optionally by the MBAC through the following output:
- Digital output with relay in wiring harness
- PWM output
Gas fill level sensor
A gas fill level sensor can be mounted externally to a gas bottle and connected to the MBAC to monitor the fill level.
Bluetooth® antenna
A Bluetooth® antenna supports communication between compatible smart devices.
The Bluetooth® antenna can be connected to the Bluetooth® interface of the MBAC and used for the system test.
Models
The software of the head unit or smart phone or tablet app provides the following software functions (so-called models):
- ClimateControl
- ColorLight
- DimmableLight
- Key
- MechanicalControl
- OnOffControl
- ReadOnlyValue
- TunableLight
- WritableValue
- Battery
- UserMessage
- AlarmFunctions
ClimateControl
This model can be used to actuate heating and air-conditioning units. The properties of this model include the "Minimum temperature", "Maximum temperature", "Energy source", "Power" and the "Fan".
ColorLight
This model can be used to actuate color lights. A property of this model is the "Light type" that describes, for example, whether it is main or ambient light. Furthermore, there are properties for the intensity values for combining red, green and blue colors.
DimmableLight
This model can be used to actuate dimmable lights. This model manages the "Light type" and "Brightness value" properties.
Key
This model is used for reading in pushbutton switches.
MechanicalControl
This model can be used to actuate motor actuations. Important parameters are timeout times for reaching a safe or functional end position, which in turn represents properties.
OnOffControl
This model is used to control devices that require simple ON/OFF logics.
ReadOnlyValue
This model is used for reading in values. The properties of the model are the "Input type" and the "Input structure":
- "Input type": Digital or relative values serve here as an input variable.
- "Input source": The values come over an I/O interface or over the LIN bus.
TuneableLight
This model can be used to actuate lights with different color temperatures. The parameters to be used here are "Brightness" and "Mix value".
WritableValue
This model is used for writing values. The properties of this model are "WritableType" and "LowLevelTarget":
- "WritableType": Digital or relative values serve as an output parameter.
- "LowLevelTarget": The values are written to an I/O interface or to a LIN bus.
Battery
This model can be used to process important parameters of a body or starter battery. The parameters are mapped in the parameters "Voltage", "Current", "Temperature", "Remaining time", "State of health" and "State of charge".
UserMessage
Messages that are used to inform the user about the relevant vehicle status or to warn him are processed in the "UserMessage" model.
AlarmFunctions
This model can be used to process important parameters of an alarm system. The parameters are mapped in the parameters "CriticalKOGas", "CriticalSmoke", "CriticalLPGGas", "AlarmTest", "AlarmHorn", "AlarmExteriorLights" und "AlarmHazardLights".
| Overview of system components of caravan control unit | GF54.21-D-9992TSA |