User manual

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Liebert
®
iCOM
®
84
4.3.3 Terminate the Final Sensor on the CANbus Link
2T Sensors do not need to be addressed in numerical order. For example, if four sensors are
purchased, they can be connected as shown in Figure 72.
Figure 72 2T sensor arrangement and termination
In the above example, if additional sensors are added to extend the existing sensor network, Sensor
#4 must be unterminated. The additional sensors can be connected. The last sensor in the extended
network must be terminated.
Terminating Last 2T Sensor
The last 2T sensor on the network, which can be identified by only having one CAN cable plugged into
it, must be terminated. All other 2T sensors on the network must remain unterminated. The following
pictures show the location of the jumper that determines if the 2T sensor is terminated.
To terminate a 2T sensor:
1. Open the sensor’s case by removing the three screws that hold it together.
2. Pull the black jumper off the circuit board from Pins 1 and 2 (see Figure 73).
3. Install the jumper on Pins 2 and 3.
4. Reassemble the sensor housing.
Figure 73 Termination jumper setting
Liebert iCOM Terminated Sensor #4Sensor #2 Sensor #3 Sensor #1
The key is to have the last sensor in the chain terminated.
CANbus
Communication Link
Terminated
Sensor
2T
#4
2T
#2
2T
#3
2T
#1
Unterminated
Terminated
321 321
Termination Jumper
in the Terminated Position
Circuit board inside display housing
Circuit board inside 2T sensor housing