Connecting An Rs-485 Serial Cable - Vertiv Liebert IntelliSlot Unity Card Installer And User Manual

2.1.4 Connecting an RS-485 Serial Cable

Unity cards come with an Adapter RJ-45-2POS Terminal Block. The adapter has two screw terminals to
attach the ends of a RS-485 cable for communicating to a building management system.
1. Find the serial cable from the building management system. If it already has an RJ-45
connector on the end, determine whether it uses the same pin-out as the Unity card's
connector.
• If the pin-out is the same as the card connector's pin-out, skip to Step 6.
2. Strip the ends of the positive (typically red) and negative (typically black) leads on the RS-485
cable so that enough bare wire is exposed for connection, about 1/4 in. (6 mm).
NOTE: No bare wire should be exposed when the connection is completed.
3. Position the adapter so the side with the positive and negative marks is face up. The small
markings are on the same side as the screw heads, as shown.
Figure 2.2 Adapter terminal-block marks face up
ITEM DESCRIPTION
1 Screws
2 Wires
4. Loosen the screw to the positive terminal and insert the red wire far enough into the terminal
block to insert the bare wires under the screw, then tighten the screw using care not to break
the wires.
5. Repeat Step
6. Plug the cable into the 485 RJ-45 port on the Unity card. See
page 1, for the location of the port.
6
3 with the negative terminal and the black wire.
IS-Unity-DP Card Features
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