connect the CAN bus reference ground (sometimes referred to as CAN_V-) to one or
both COM pins.
The D-Sub connector shell connects through the TRC-8543 shielding to the
connector on the host port end. The shielding does not electrically connect to the
COM signals.
Caution
When tightening the D-Sub connector jackscrews, do not exceed
the maximum jackscrew torque of 0.56 N · m (5.0 lb · in.).
The TRC-8543 receives power from the NI-XNET host port, but also requires an
external power supply of +9 V to +30 V to operate in Low-Speed/Fault-Tolerant
mode. Supply power from the CAN bus to the V
SUP
pin.
Note
Power on V
SUP
is required for Low-Speed/Fault-Tolerant CAN
operation, but is not required for High-Speed CAN operation.
The TRC-8543 features software-selectable bus termination for both CAN High-
Speed/Flexible Data-Rate and Low-Speed/Fault-Tolerant transceivers. For High-
Speed/Flexible Data-Rate mode, you can enable 115 Ω of termination resistance
between CAN_H and CAN_L through an API call. For Low-Speed/Fault-Tolerant
mode, you can select either 1.11 kΩ or 4.99 kΩ of termination resistance for RTH and
RTL through an API call (refer to the Termination Resistors section for more
information). If you choose to use external termination, Table 4 lists recommended
termination resistor values.
The following table lists the TRC-8543 pinout.
Table 5.
Pin Assignments for the TRC-8543
Connector
Pin
Signal Name
1
No Connection (NC)
2
CAN_L
3
COM
4
NC
5
NC
6
COM
7
CAN_H
ni.com
8
TRC-8543
Содержание TRC-8543
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