Measurements On The Can Bus - Sirona Intego Service Manual

5 Important information
5.3 CAN BUS
24
5.3.2

Measurements on the CAN BUS

In each CAN network there are 2x 120-ohm resistors that, measured in
Measurement on the CANBUS
parallel on the CAN line, result in 60 ohms. If you measure 120 ohms on
the CAN line with an ohmmeter (when the dental treatment center is
switched off), there is a disruption in the line. In the case of a disruption,
measure the connections between the connectors.
The CAN bus should always be checked for missing components.
Examples of CAN measurements
Example of a CAN measurement
Resistance = 60 ohms
Cable run OK
Measurement of CANH → CANL
Resistance = 120 ohms
Fault in the cable run
Measurement of CANH → CANL
Resistance = 0 ohms
Cable run OK
Measurement of CANL source → CANL target
Resistance = 240 ohms
Fault in the cable run
Measurement of CANH source → CANH target
IMPORTANT
NOTE RE DARWIN
The individual boards feature special measuring points for CAN bus
measurement. These are described in Chapter: Overview of modules
and boards [ → 40] .
Sirona Dental Systems GmbH
Service Manual INTEGO / INTEGO pro
64 57 316 D3543
D3543.076.01.04.02 06.2015