Liebert Universal Monitor - Manual (Page 37)

Wiring and Connections - Optional Expansion Board
29
5.3 Connect to the Universal Monitor
Two steps are required to establish connection between the optional Expansion Board and the Uni-
versal Monitor.
5.3.1 Connect EIA485 Connectors to Main Board
To connect the optional Expansion Board to the Universal Monitor:
1. Turn OFF electrical power to the Universal Monitor and disconnect power from the Expansion
Board.
2. If necessary, remove a conduit knockout to permit wire entry into each enclosure.
3. Bring the wire(s) into each enclosure through a conduit knockout or access slot.
4. Loosen the appropriate screw and slip the stripped end of the wire into the terminal block,
connecting the cables as shown in the figure below):
• Connect the Universal Monitor 485 connector UM- to Expansion Board connector EIA485+.
• Connect the Universal Monitor 485 connector UM+ to Expansion Board connector EIA485-.
5. Tighten each screw until it holds the wire snugly.
5.3.2 Enable the Connection via Firmware
After making the cable connections described in the previous section, you must specify the Expansion
Board as connected using either the LCD or Service Terminal Interface.
For instructions, refer to the appropriate section:
• LCD interface (see 9.10 - Setup Exp Board - Optional Expansion Board)
• Service Terminal Interface (see A.6.8 - Connect Expansion Board)
485
+ —
+ —
(TOP)
(BOTTOM)
TB10: COMMS
422
S4 S3 S2 S1
Multiflex 168AO 810-3065
D6
POWER INPUT
EIA485 + (to UM-)
0V
EIA485 - (to UM+)
UNIVERSAL MONITOR
EIA485 connector
OPTIONAL EXPANSION BOARD
EIA485 connector
Connect
UM- to
EIA485+
Connect
UM+ to
EIA485-
EIA485+
EIA485-
UM-
UM+