FOCUS 200 PLUS Installation and Setup Guide3-2Installing the Operating PanelsEach operating panel connects to a port in the control unit via a cable known as an RS-485 bus. Thecontrol 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 16,000feet by using a 472430 RS-485 Repeater at the end of each bus. Current loading and voltage dropconsiderations may limit the maximum allowable wire lengths on each RS-485 bus to less than 4000feet. See the Power Requirements section for additional information.RS-485 Cable TypesTwo types of bus cable are used. Each is a 4-conductor multi-gauge cable as described in the tablebelow, 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 ConsiderationsThe safeguarding of RS-485 bus cable(s) from physical damage is vital to continuous uninterruptedoperation of the FOCUS 200 PLUS System. Keep the following guidelines in mind when running thecable:• Bus cable(s) should be routed to take advantage of the shortest possible length of cable, tominimize 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 duringtroubleshooting.• There are no bus-terminating jumpers on the control unit circuit board. Each device on the bus hasa terminating jumper. Make sure only the last device has the jumper set. Also, neither of the busesby 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° F (0° C) or riseabove 122° F (50° C). At temperatures below 32° F, the display will fade and the glass may crack.Temperatures above 122° F will affect the display output.Mounting and Wiring the Operating PanelJUMPER E1(REMOVE JUMPER TODISCONNECTTERMINATION RESISTOR) BLACK WIRE 4 FLYING LEADSFOR FIELD WIRINGEXTERNAL TAMPERCONNECTIONU4 U3 U2 U1Figure 3-1: Details of the Operating Panel Circuit Board
