These settings define if and when the display sends a request (for receive mappings) or
answers a request for a transmit mapping.
The only pre-requisite is that the ECU sending the request is "known", i.e. defined in the
ECU Configuration .
Enable Request
For receive mappings this means that the display will send out a request to get the
Mapping based on the following settings.
For transmit mappings this means that the request defined in the following properties will
be recognized and answered with the transmit mapping.
Request message
This allows definition of a Message with fixed data section which will be sent out in order
to get the receive mapping based on the following triggers.
Request Message Transmission Period
This is only enabled for receive mappings. It defines the interval in milliseconds the
display will send requests for the mapping. Set to 0 if no periodic request is required.
Send Request On
·
"Specific Variable Change" allows triggering the request based on the value
change of any variable in the project.
·
"None" means there is no trigger besides the time based one.
Select Variable (Rx)
Only enabled if this is a receive mapping, request is enabled and "Send Request On" is
set to "Specific Variable Change". This allows setting the variable whose value change
should trigger sending the request.
Receive Timeout
This is intended for receive mappings which are expected to arrive periodically - either
by default or by periodic request. If the mapping is not received in as many milliseconds
as defined here all variable values of the mapping are considered invalid and hence all
DDOs showing them will also be disabled (i.e. numeric fields shown with dashes, meters
and such grayed out).
Use as Write Request
If checked this means that the transmit mapping will be sent out once if there is a write
request to one of the variables contained in the mapping. Usually the display only sends
values provided by the owners of the respective variables in transmit mappings.
This means that e.g. engine speed will only be sent out as provided by engine ECU. If in
your system modifying the measured engine speed value is used to set a new desired
engine speed then you can check this property and writing on the engine speed variable
will send out the transmit mapping containing the new setpoint of the engine speed
value.
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