Installing The Operating Panels; Figure 3-1: Details Of The Operating Panel Circuit Board - ADT FOCUS 200 PLUS Installation And Setup Manual

FOCUS 200 PLUS Installation and Setup Guide

Installing the Operating Panels

Each operating panel connects to a port in the control unit via a cable known as an RS-485 bus. The
control unit can accommodate two independent RS-485 buses of 4000 feet each, permitting an end-to-
end reach of up to 8000 feet if using both buses. The total end-to-end reach can be extended to 16,000
feet by using a 472430 RS-485 Repeater at the end of each bus. Current loading and voltage drop
considerations may limit the maximum allowable wire lengths on each RS-485 bus to less than 4000
feet. See the Power Requirements section for additional information.
RS-485 Cable Types
Two types of bus cable are used. Each is a 4-conductor multi-gauge cable as described in the table
below, differing only in the type of insulation.
•
494465 (B6445) Cable - used as general-purpose.
•
494467 (B6467) Cable - used specifically in air-handling plenums.
Cable Run Considerations
The safeguarding of RS-485 bus cable(s) from physical damage is vital to continuous uninterrupted
operation of the FOCUS 200 PLUS System. Keep the following guidelines in mind when running the
cable:
•
Bus cable(s) should be routed to take advantage of the shortest possible length of cable, to
minimize voltage drop.
•
Any junction boxes (test terminals) that are required can be placed to be accessible from the floor.
Junction boxes can also be used to sectionalize the bus, and in this way serve as an aid during
troubleshooting.
•
There are no bus-terminating jumpers on the control unit circuit board. Each device on the bus has
a terminating jumper. Make sure only the last device has the jumper set. Also, neither of the buses
by itself can be used in a dual-run configuration (two runs from a common connector).
Do not locate the operating panel in any area where the temperature may drop below 32
above 122
Temperatures above 122
Mounting and Wiring the Operating Panel
TERMINATION RESISTOR)
EXTERNAL TAMPER
3-2
° °
F (50 C). At temperatures below 32
°
F will affect the display output.
JUMPER E1
(REMOVE JUMPER TO
DISCONNECT
BLACK WIRE
CONNECTION

Figure 3-1: Details of the Operating Panel Circuit Board

°
F, the display will fade and the glass may crack.
4 FLYING LEADS
FOR FIELD WIRING
U4 U3
°
F (0
U2 U1
°
C) or rise