The Signaling Solution, Inc.
PO Box 25
West Terre Haute,
IN 47885
Phone:(812) 533-1345
Fax:(708) 570-6140

BD 8 Installation Ptocedure
The tools required for the installation are listed below.
  • Soldering iron, no more than 25 Watt rating, for fixing wires.
  • Solder
  • Screwdrivers
  • Diaginal cutters
  • Needle nose pliers
  • Silicon Adhesive in order to hold the various wires in place along the benchwork
Tools required for installation

The board assembly shows how your BD8 and related items will look when ready for installation. For
your reference, the major items are identified individually.

 BD8 Board Assembly Diagram

The items shown are:

Item 1: BD8 Printed Circuit board, with top view shown.
Item 2: Mode plug with positions for four mode jumpers (none shown).
Item 3
: Card edge connector; your BD8 plugs into this connector.
Item 4
: Contact 1 of the 36 contact fingers on the card edge connector. Contact 1 is labeled on the connector itself, and corresponds to the top left contact on the PC board. Contact A is immediately below contact 1. The top row of contacts are numbered from 1 to 18; the bottom row is lettered A-V. Letters “G”, “I”, “O”, and “Q” are not used.
Item 5: Pan Head #4-40 stainless steel machine screw (2 places) used to fasten the card edge connector to the right angle mounting brackets.
Item 6
: Flat #4 stainless steel washers (4 places) used to protect surfaces from the screws and lock washers.
Item 7: Internal tooth #4 lock washer (2 places) used to secure the mounting screws and brackets.
Item 8: Stainless steel #4-40 hex nut (2 places).
Item 9
: Round head #4 wood screw (2 places) used to attach mounting brackets to the mounting panel.
Item 10
: Right angle mounting bracket (2 places).
Item 11
: The surface mounted voltage regulators.
Item 12:
The LED blinks when power is applied.

Physical Installation of the board

Panel layout ready below shows the BD8 mounted to a flat wood panel ready for installation on your layout.

  • A piece of 1 x 6 six to eight inches long, or a similar size piece of plywood, is just fine.
  • Then attach the panel in an easily accessible location on a table leg or from the bottom of an L-girder. You will find it much easier to prepare the panel as shown at your workbench. Doing this under your layout will probably be more difficult. Remember that you will be running wires from the board to the blocks and your signals or control panels.
  • Plan how the wires will be routed from the board and to the layout.

Suggestion: Use cable clamps to keep the various cables from placing any strain on the card edge connector pins and out of the way.

  • Use a strain relief to protect the contacts on the card edge connector.

Suggestion: For the larger gauge wires to your tracks and layout common, we suggest you use a Cinch Barrier Block part number 9-140. The current Digikey catalog (1-800-344-4539) lists this with their part number CBB109-ND. For the smaller gauge wires to your signals, a simple cable clamp will do. A nylon cable clamp from the Richco line (also available from Digikey) will do. They come in several diameters, so pick the right size for the wire bundle going to the signals. You want the clamp to hold the wires securely and keep them from putting strain on the connector pins.

Incidentally, the screw barrier strip is a good idea for troubleshooting. It makes is easy for you to disconnect blocks, or to swap BD8 detectors to aid in fault isolation. The small cost for such strips is well worth it.

5. If the distance from the BD8 and the blocks is particularly short, and your engines are equipped with low current can motors, you can probably run your common rail feed wires using 22 gauge wire. If you use stranded wire and a tight cable clamp to keep the wires from pulling on the connector contacts, you could connect directly to the card edge connector. See Section 6.2 for more detail on selecting wire sizes. Since the wires to your signals will probably be 22 gauge or finer, a simple cable clamp will be adequate. Stranded wire will be easier to work with. You may want to consider using four-conductor modular phone cord. It’s available almost everywhere, and at a very low price. The four wires in the bundle are color-coded and, while fairly fine, they are easy to work with.

BD8 and Panel Layout Ready
Item 1: Screw barrier strip with 9 positions.
Item 2:
Common rail wires for blocks 0-3 from contacts 1-4.
Item 3:
Common rail wires for blocks 4-7 from contacts A-D.
Item 4:
Layout common. Connect to at least 2 of the four contacts 5, 6, E or F.
Item 5:
16 occupied and vacant wires to signals on control panels.
Item 6:
Nylon cable clamp, sized to clamp wires snugly.
Item 7:
Two wire power feed from wall mounted power supply provided with your BD8.

For more details, please check the BD8 user manual
The Signaling Solution, Inc. PO Box 25, West Terre Haute, IN 47885