Individual tests
5.2 Termination
resistors
In the test of the termination resistors the CANcheck measures the resistance be-
tween CAN_H and CAN_L on the CAN connector. The pin assignment of the CAN
connector corresponds to CiA DS-102 (see section 2.1.1).
The CANcheck checks whether the resistance of the parallel circuit of two termi-
nation resistors between CAN_H and CAN_L is measured with 120
Ω
in each
case. The tolerance range for the termination resistors is given in section 10.1.
However, CANcheck does not check the number of termination resistors. One
termination resistor with 60
Ω
or three termination resistors with 180
Ω
each
would therefore also produce a positive test result. In these cases, negative test
results can be expected in the operational tests in sections 5.9 and 5.10.
For the test of the termination resistors you can connect the CANcheck to the
CAN network at any point. Please switch the CAN network off before the test. In
addition, you should disconnect all CAN nodes from the network. Switched off
CAN nodes with a high resistance between CAN_H, CAN_L and ground can re-
main connected. As the resistors of all connected CAN nodes are parallel, how-
ever, the resistance of every individual CAN node must then be greater than the
"number of CAN nodes" x 1 k
Ω
.
Please select the menu item "termination resistors" with the keys UP and DOWN
and press the OK key.
Individual tests
▼
-Wiring test
-Term. resistors
-Line length
-Line impedance
-Power supply
-Baudrate detection
When the CAN network is switched off, the test instructions appear. Error mes-
sages are explained in section 6. When you have followed the test instructions,
please start the test with the OK key.
During the measurement, a message appears. After the measurement, the test
result appears.
Copyright IXXAT Automation GmbH
CANcheck Manual, Version 1.2
28
