HBM SOMATXR, Руководство по эксплуатации, Страница: 49 / 152

Functional description
CANBus
A4461-2.0 HBM: public
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6.5.8.1 Control
A CAN message is only sent when a control indicating
the connector and the index of the CAN message has
been transmitted. A control can be transmitted, for exam­
ple, by using the MX Assistant menu or button.
6.5.8.2 Timer
The user defines a time interval (in microseconds). The
CAN messages are sent automatically at this time inter­
val. If “Interval = 0” is set, no CAN messages are sent.
The transmission of a CAN message can also be trig­
gered by a control (see Section 5.8.1).
The data in the CAN message correspond to the
instantaneous value and are not synchronized to the data
source.
In the MX471B, we implement timer resolution by count­
ing the isochronous events (1200 Hz). The period of the
CAN messages thus corresponds to multiples of
1/1200 seconds.
In the MX840B, triggering occurs in 1 ms steps, with the
shortest period being 10 ms per CAN message.
6.5.8.3 SourceChange
If the value of the source for the value most recently sent
changes by the absolute value <Delta>, the CAN mes­
sage is transmitted. <Delta> is defined in the parameters
of each source. If several measured values are “mapped”
in a CAN message, the entire CAN message is sent
when a source changes.