PR3/PR3Xtra (PR3)

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Computer Interface:

Digitrax: PR3/PR3Xtra (PR3)

Summary: The PR3, which was superseded by the PR3 Xtra, is a device that allows downloading of sound files or reflashing the firmware of a Digitrax sound equipped multifunction decoder. It also functions as programmer for multifunction decoders, and a bridge between USB and LocoNet.

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General information
DCC Category
Computer Interface
Manufacturer Digitrax
MSRP 86 USD87.55 EUR <br />76.60 GBP <br />129.97 AUD <br />116.02 CAD <br />
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Manufacturer Part Number
Common Name PR3/PR3Xtra
UPC Number 652667120067
Release information

Product URL External Product Link
Product Manual URL External Product Link
Year Released 6/2013
Year EOL 12/2017
Has computer interface USB 2.0
Firmware Upgrade Possible
Predecessor MS100, PR2
Successor PR4
Misc Details


Superceded by the PR3 Xtra, and later by the PR4/PR4 Xtra The PR3 and PR3Xtra have been superseded by the PR4


  • Digitrax SoundLoader compatible
    • Programs Digitrax sound projects in to SFX decoders
  • Programs CVs for most DCC multifunction decoders
  • LocoNet MS100 mode
  • Mac OS with JMRI
  • Windows XP, Vista, 2000, 7, and 8
  • Requires a programming track.

It can also act as a bridge between LocoNet and a computer. It uses a USB 2.0 interface to a computer.

The PR3 is not as fast as the newer PR4.


The PR3 is a Digitrax LocoNet device which enables programming of multifunction decoders, as well as updating firmware in multifunction decoders and throttles. It also functions as a bridge between USB and LocoNet, allowing a computer to be connected to your LocoNet.

PR3 Xtra

The PR3 Xtra was a PR3 packaged with a power supply. Otherwise, it is identical.

Status LEDs

For a table of the status LEDs, see PR4 Status LEDS


This is the Initial Program Loader which is used with the PR3/PR3 to update the firmware in Digitrax products. Included with the SoundLoader software. Requires a computer running MSwindows.


Mac OS X 10.8: PR3 with OS X

Power Supply

The original PR3 did not come with a power supply, Digitrax recommended a maximum supply voltage of 20VDC. With the introduction of the PR3 Xtra, the voltage recommendation was lowered to 15VDC, in line with their included power supply.

For better results when programming, a 16 – 18V power supply is recommended. For use with Digitrax multifunction decoders the PS14 power supply is recommended.[1]


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  1. Some Digitrax multifunction decoders may be damaged by voltages other than those provided by the PS14.