Rockwell Automation Publication 1766-UM001O-EN-P - September 2021 67
Chapter 4 Communication Connections
Recommended Tools
To connect a DH-485 network to additional devices, you need tools to strip the
shielded cable and to attach the cable to the AIC+ Advanced Interface
Converter. We recommend the following equipment (or equivalent):
DH-485 Communication Cable
The suggested DH-485 communication cable is either Belden #3106A or #9842.
The cable is jacketed and shielded with one or two twisted-wire pairs and a
drain wire.
One pair provides a balanced signal line and one additional wire is used for a
common reference line between all nodes on the network. The shield reduces
the effect of electrostatic noise from the industrial environment on network
communication.
The communication cable consists of a number of cable segments daisy-
chained together. The total length of the cable segments cannot exceed 1219 m
(4000 ft). However, two segments can be used to extend the DH-485 network
to 2438 m (8000 ft). For additional information on connections using the AIC+,
see Advanced Interface Converter (AIC+) User Manual, publication
1761-UM004
.
When cutting cable segments, make them long enough to route them from one
AIC+ to the next, with sufficient slack to prevent strain on the connector. Allow
enough extra cable to prevent chafing and kinking in the cable.
Use these instructions for wiring the Belden #3106A or #9842 cable. See Cable
Selection Guide on page 70 if you are using standard Allen-Bradley cables.
Connect the Communication Cable to the DH-485 Connector
Working with Cable for DH-485 Network
Description Part Number Manufacturer
Shielded twisted pair cable #3106A or #9842 Belden
Stripping tool Not Applicable Not Applicable
1/8” slotted screwdriver Not Applicable Not Applicable
A daisy-chained network is recommended. Do not make the incorrect connection
shown below:
Belden #3106A or
#9842
Belden #3106A or
#9842
Belden #3106A or
#9842
Incorrect
ConnectorConnector Connector
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