Hardware Reference Guide SST-DN4-PCU
1.5.1.2 CANH, CANL
These are the CAN communication bus signal terminals. Use only shielded twisted pair cable.
1.5.1.3 SHIELD
This is the shield connector. This terminal is “snubbed” to the PC/PCI chassis ground via a
1M-ohm resistor.
Note
Card Overview 17
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According to the DeviceNet specification, the snubber circuit can be
omitted if the card has no local connection to ground.
Note
The shield should be connected directly to earth ground at only one
point in the network. Refer to Section 2.4, Connecting to a Network,
for more information.
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