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The BDL162 lets you know when a detection section on your layout is occu-

pied. This occupancy detection capability is the first step toward prototypical

control of your rolling stock, signaling, realistic surround sound effects and

realistic modeling of your layout. Installing the BDL162 on your layout is easy

and will make more prototypical operations possible.

The BDL162 uses digital signal processing (DSP) to give you occupancy

detection for 4 zones, A through D, each with 4 detection sections, for a total

of 16 detection sections. The number of BDL162s you use on your layout is

determined by how many areas of track you want to monitor and how automat-

ed you want your layout to be--more detection sections require more BDL162s.

On your Digitrax system, the BDL162 reports detection section occupancy to

the system via its LocoNet connection. This makes occupancy information

available for use by any LocoNet device hooked up to LocoNet. For instance,

the information can be used by the SE8/SE8c to set signals or by a computer

program for dispatch control. A BDL162 can also host transponder detectors

like the RX4 to let you implement Digitrax transponding for additional dis-

patcher control, surround sound or more layout automation.

On DCC systems without a Digitrax compatible LocoNet command station, a

BDL162 can operate using only the RailSync DCC signal from any DCC sys-

tem. In this case, the BDL16 can report detection information via a user-

installed LED display panel.

Following are some terms you might find useful as you work with the

BDL162.

Direct home wiring is a layout wiring method where each power district and

its booster is electrically isolated. The track within each power district uses a

"common return" wiring method for occupancy detection and/or power man-

agement. Direct home wiring is the wiring method recommended by Digitrax

for safety reasons & also because it makes detection work more prototypically.

Power district is the power wiring, track, components and equipment attached

to that wiring, driven by a single properly isolated booster. The track for a

power district is double gapped on both ends of the district. The BDL162 is

used to set up detection sections within one or more power districts.

Power sub-district is the wiring, components and equipment that are con-

trolled from both power bus wires by their own power management device, for

example a reversing section controlled by an automated reversing device like

the PM42. Power sub-districts are gapped on both ends.

Detection common is the common return used within a properly electrically

isolated power district for implementing occupancy detection.

Security element is the plant, including track, associated with any reporting,

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interlocking and/or signaling for that track section.

Whole layout common rail is a method of wiring layouts where power dis-

tricts and their boosters are connected electrically by a common rail or com-

mon power bus return wire. This method is traditionally used for conventional-

ly controlled layouts. The track feeds for one rail are connected together to one

output of the power pack. The other rail is gapped and the track feeds are con-

nected to the power pack through block control switches. Whole layout com-

mon rail wiring has a disadvantage when it comes to detection systems because

detectors are not able to independently monitor whether zone power is on or

off. There is no way to tell whether occupancy detection is actually working in

any given detection section.

Detection Section is a section of track gapped on one or both rails and con-

nected to an occupancy detector so that the detector can sense the presence of a

loco (or other specially equipped cars) in that section of track.

Occupancy detector is a device that senses the presence of a locomotive (or

specially equipped cars) in a section of track that is set up for occupancy detec-

tion. Occupancy detectors also provide feedback to indicate occupancy. This

feedback may be in the form of a lamp on a control panel or it may be a feed-

back message sent to the system that can be used by other layout devices. Also

called a block occupancy detector on conventional layouts. Detectors are not

covered by the DCC Standards or Recommended Practices.

Transponder is an electronic device that is installed in rolling stock and can be

assigned a unique address. Transponders provide information to transponder

detectors installed on the layout. This lets the system determine in which detec-

tion section the transponder is currently located. Transponders are included in

many Digitrax premium decoders. TD1 (transponder) & TL1 (transponder with

light output) are available as separate units that can be added to locos with

existing decoders or to other rolling stock without decoders if you want to use

them for transponding only and don't need motor control.

Transponder detector is an electronic device installed in a detection section

on the layout that receives the information broadcast from a transponder. The

transponder detector sends feedback to the system to let it determine the detec-

tion section location of any given transponder at any time. RX4 Transponder

detectors are hosted by the BDL162 and upgrade 4 detection zones of the

BDL162 to be transponder detection zones. In this case, each transponding

zone encompasses 4 detection zones.

The BDL162 is divided into four zones. Each zone supports 4 detection sec-

tions and each zone can be run from a different booster.