BlueBox
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4.4 Checking the Termination
Please take notice of the correct termination of the
single modules to assure a correct performance of
the CAN-bus.
The termination can be controlled by measuring
the resistance between CAN-High and CAN-Low
with a multimeter.
The measurement can be done at any device of
the CAN-bus-system.
The easiest way to measure this resistance is
underneath the spring clips. That is the reason
why it is advisable to measure at modules with
clamps.
The measuring procedure is described in the fol-
lowing:
Consider that the modules that are going to be
proved are without voltage, i.e. the power supply
of the BLUEBOX has to be switched off.
Measure the resistance between CAN-High and
CAN-Low as it is shown in the illustration.
The measured value should be between 55 Ω
and 70 Ω. At the following divergency the respec-
tive errors are:.
0 Ω short circuit in line
< 55 Ω more than one module terminated
120 Ω only one termination
(for example, only the BlueBox is
terminated)
>120 Ω no module is terminated or
cable break
Korrekte Terminierung
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