Digitrax BXP88 Instruction Manual - Page 5

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4.0 BXP88 Installation Notes

The BXP88 is only compatible for use with Direct Home Layout wiring and re-

quires a LocoNet compatible system for Detection/Transponding Reporting. The

BXP88 is also not designed for use with Auto Reversing sections.

The BXP88 can be located for convenience and ease of installation. Consider

placing these units on swing-down panel(s) at the layout fascia to support a sec-

tion of close by tracks. This allows easy front access during construction, debug

and maintenance, without having to work upside down under the layout.

Ensure that booster and track feeds are sufficient to carry currents and detect

short circuits. We recommend at minimum 14AWG bus lines and 22AWG feeder

connections up to the rails.

When installing multiple BXP88s or BXP88s in conjunction with other devices

ensure that Rail A and Rail B are consistent between all Power Districts so rolling

stock can cross the double gaps without short circuits. Rail A and B inputs to the

BXP88 can be switched as needed to match existing wiring, the BXP88 automati-

cally sets railsync.

An LT5 tester is included with the BXP88, and optional fascia LED panels can be

constructed following the instructions in section 10.3 .

The BXP88 does not need to be externally powered. An optional auxiliary 9V

150ma DC power supply may be used to allow the BXP88 to remain on when

track power is lost. Multiple BXP88s can be powered from the same supply as

long as 150ma is available for each unit. The optional 9V DC supply should not

be shared with any other non-BXP88 devices.

The primary advantage to additional auxiliary powering of the BXP88 is the

BXP88 can default to report Detection Sections as occupied when track power

is lost. This allows for signal or computer logic to respond appropriately. Addi-

tionally, if the BXP88 is auxiliary powered it can report other track and LocoNet

faults via its LED indicator connectors.

When a BXP88 is powered up on a Digitrax Layout it will automat-

ically disable analog stretching, by setting OPSW 20= Closed in the

Command Station. The BXP88 is not compatible with analog mode

stretching, and you will not be able to run conventional DC loco-

motives at address 00. All locomotives will need a DCC decoder to

operate.

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