TU501-x
Short Guide TU501-x v4.2, May 2019, ©Trackunit 2019 9
CAN bus termination resistor
When installing the TU501-4 on a J1939 CAN-bus, it is very important to determine if the
installation is on a “private” CAN-bus directly to the CAN controller, or if the TU501-4 is to be
installed as a stub on a CAN-bus with multiple CAN devices already attached.
The 120-ohm termination resister is a permanently installed resistor, so make sure to use and
select the correct TU501-4 CAN-bus version.
With 120-ohm bus termination (directly connected)
Without bus termination (stub connected)
NB! When the unit is stub connected, the wire length must be minimized to avoid CAN-bus noise and
error ratio.
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