Install 2T Sensors On Racks To Be Monitored; Figure 56 Termination Jumper Setting - Emerson Liebert iCOM Manual

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 56).
3. Install the jumper on Pins 2 and 3.
4. Reassemble the sensor housing.

Figure 56 Termination jumper setting

Circuit board inside display housing
4.3.4

Install 2T Sensors on Racks to be Monitored

No special considerations are required for cable up to 150 ft. (45m) long. A CANbus isolator is
required for cables between 150 ft. and 300 ft. (45m and 91m). Contact the factory if using CANbus
cables longer than 300ft (91m).
The CANbus cable network requires a ground wire. The grounds are connected at each 2T sensor, the
rear of the front display and must be terminated to a field-installed ground ring in the low-voltage
electrical panel. Figure 57 show the connected grounds on a 2T sensor. The illustration on the right
in Figure 57 shows the rear of the front display with the factory-installed CANbus cable between the
display and main board replaced with a 6-foot (1.8m) grounded CANbus cable.
® ®
Liebert iCOM for Liebert DSE
Termination Jumper
in the Terminated Position
3 2 1
Unterminated
™
Circuit board inside 2T sensor housing
3 2
Terminated
78
Teamwork
1