BD4
Occupancy Detector
For 4 Detection Sections
For use with DS64 or SE8
Series Stationary Decoders
Features
n Occupancy Detection for 4 detection sections lets you know when rolling
stock is in a detection section on your layout
n Outputs for LEDs to indicate local detection section occupancy and zone
power status on a panel mounted display
n 3 Amp capacity per detection section
n Connect to LocoNet via your DS64 or SE8 series decoder to transmit occu-
pancy information to your LocoNet system (works with the older DS54 too)
n Detects any powered locomotive
n Detects un-powered rolling stock equipped with resistor wheel sets
n Anti-Chatter Filter For Reliable Occupancy Detection
Parts List
1 BD4 1 Instruction Manual
1 Block Monitor
The BD4 requires a DS64 or SE8 Series Stationary Decoder (sold separately) for
LocoNet reporting.
NOTE: The BD4 operates up to a maximum resistance across the tracks of
10Kohms for positive occupancy detection. Do not connect any other devices or
loads across the detection section track for proper operation.
Digitrax Manuals and Instructions are updated periodically.
Please visit www.digitrax.com for the latest version of all manuals.
Digitrax, LocoNet, Super Empire Builder, Super Chief, Zephyr and others included in this manual are trademarks of various manufacturers including Digitrax. Digitrax products are covered
by multiple U.S. & International Patents and Patent applications.
Digitrax, Inc. is not responsible for unintentional errors or omissions in this document.
©2010 Digitrax, Inc. www.digitrax.com 1
Complete Train Control
Run Your Trains, Not Your Track!
All Scales
Occupancy Detection
5 Amps Peak, 3 Amps Continuous
Made in U.S.A.
307-7007-0000
2443 Transmitter Road
Panama City, FL 32404
www.digitrax.com
T 850-872-9890
F 850-872-9557
BD4
Occupancy Detector for 4 Detection Sections
123
4
Detection Section 1
Detection Section 2
Detection Section 3
Detection Section 4
To Booster Rail A Connection
To Booster Rail B Connection
Rail A
Rail B (Detection Common)
*10 Pin Ribbon Cable
Connector From LED 1 Header
To Panel Mounted LEDs for
Occupancy Indication
Pin 1
Pin To LEDs
1 DS 1 Indicator LED+
2 Ground on LED
3 DS 2 Indicator LED+
4 Ground on LED
5 DS 3 Indicator LED+
6 Ground on LED
7 DS 4 Indicator LED+
8 Ground on LED
9 Track Status LED+
10 Ground for Track Status LED
DS1 Plug
Use 10 pin ribbon
cable to DS54
or SE8C
DS1
Pin 1
LED1
Pin 1
LED1 Plug with
Block Monitor plugged in
remove Block Monitor
& plug in 10 pin ribbon
cable to wire remote
occupancy indication LEDs.
Note: Block Monitor should
be plugged in with LEDs
facing away from screw
terminal connector
* A 10 Pin Ribbon Cable is the most
convenient way to wire the BD4. You
can build your own ribbon cables or you
can use the Digitrax Signal Driver Cable
Kit (Part # SDCK). Alternately, you can
wire directly to the pins on either or both
of the headers. The header pin arrangement is:
Pin 1
Pin 3
Pin 5
Pin 7
Pin 9
Pin 2
Pin 4
Pin 6
Pin 8
Pin 10
Pin Out for LED1
*10 Pin Ribbon Cable
Connector From DS1 Header
To DS54 Input Plug or SE8
Card Edge Connector
Pin 1
Pin To DS54 or SE8
1 DS 1 on DS54 or SE8
2 Ground on DS54 or SE8
3 DS 2 on DS54 or SE8
4 Ground on DS54 or SE8
5 DS 3 on DS54 or SE8
6 Ground on DS54 or SE8
7 DS 4 on DS54 or SE8
8 Ground on DS54 or SE8
9 Not Used
10 Not Used
Pin Out for DS1
Note: All detection sections from each
BD4 must be powered by the same
booster. (They must all be in the same
power district.)
Pin 10 must be must be connected to system
ground such as the AX1 terminal of
the DS64, Ground on the
booster terminal, etc.
Pin 10
BD4 Wiring Diagram
See www.digitrax.com for additional information about BD4, DS64 and SE8 series decoders.
The BD4’s sensitivity can be decreased by connecting a 1/4 watt resistor in the range of
47ohms to1 Kohm from the DS (detection section) screw terminal to the Rail A screw terminal
on the screw connector on the BD4. Each DS 1-4 can be adjusted separately.
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