Technical Specifications

Liebert iCOM
144
Figure 135 Liebert XDO CANbus port locations
7.12 CANbus Termination
The last device in the chain must be terminated.
• The remote temperature and humidity sensors are terminated at the factory.
• The Liebert XD smart modules are not terminated at the factory. Improper termination will cause
communication errors.
7.12.1 Remote Temperature and Humidity Sensors Termination
The control board is terminated at the factory. If a remote sensor is the last device in the CANbus
chain, no changes are necessary. The termination jumper must be removed if a remote sensor is not
the last device in the CANbus chain. Refer to the Liebert XD module user manual for terminating
procedures.
7.12.2 Terminating a Smart Module
Liebert XD smart modules must be properly terminated or communication errors will result. Smart
modules are shipped from the factory unterminated. If the smart module is the last device in the
chain—in other words, the last module is not connected to a remote sensor—the smart module control
board must be terminated. Refer to the Liebert XD module user manual for terminating procedures.
DPN000784
Rev. 1
To next Liebert XDO
or Remote T/HSensor B
Notes:
1. CANbus signals from the Liebert XDP or Liebert XDC
must be connected to P66 on the first Liebert XDO.
To connect to the next Liebert XDO or Remote T/H Sensor,
plug the CANbus wire into P67 of the previous
Liebert XDO Cooling Module and plug into P66
of the next Liebert XDO or Remote T/H Sensor B.
2. Recommended configuration shown; consult Liebert
for other configurations.
To Liebert XDP/XDC
Front of
Liebert XDO
Top of
Liebert XDO
Top of
Liebert XDO
Rear of Liebert XDO
Right Side of
Liebert XDO
Section A-A
P67
P66
A