Digitrax BXP88 Manual de instrucciones - Página 12

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LED for DS2 or DS6

LED for DS1 or DS5

10.3 Panel Indicator Wiring

You can build a display panel with a track schematic and LEDs to indicate track

occupancy by connecting LEDs to the LT5 compatible output connectors on the

BXP88. For a panel display of occupancy status made up with user supplied

LEDs, connect to the four 0.1" 2x5 headers, and wire up high brightness LEDs

as shown in Figure 3: LED Panel Indicators Wiring. The plugs and ribbon cable

included in the Digitrax SDCK Signal Driver Cable Kit can be used.

Figure 3: LED Panel Indicators Wiring

The BXP88 incorporates current setting resistors to set the LT5 LED current typi-

cally to about 1~3mA. If you need higher LED drive currents you can use external

transistors etc. to amplify the LED current.

The LT5 header drive from the BXP88 is active high at about +3.5 volts, via a

1 Kohm resistor. Note that the ribbon cable includes separate ground return

conductors for each LED that allow a 10 conductor ribbon cable to be split into 5

pairs to conveniently routed to individual LEDS. Be sure to connect the +ve active

detection section output wires to the LED anodes. Do not connect any LT5 wiring

to other voltages as this may cause damage and void the warranty.

Figure 2: LT5 Tester

LED for DS3 or DS7

Ribbon Cable and Plug

— 12 —

LED for DS4 or DS8

Zone Power LED

Zone Power

DS1 or DS5

DS2 or DS6

DS3 or DS7

DS4 or DS8