PR4 Programmer (PR4)

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Digitrax: PR4 Programmer (PR4)

Summary: The PR4 is a LocoNet device that allows downloading of sound files to a Digitrax sound decoder, or reflashing their firmware. It is also used to update the firmware for Digitrax throttles and command stations. It provides a USB to LocoNet interface as well.

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General information
DCC Category
Manufacturer Digitrax
MSRP 95 USD96.71 EUR <br />84.62 GBP <br />143.57 AUD <br />128.16 CAD <br />
Compare Prices Latest Prices
Manufacturer Part Number
Common Name PR4 Programmer
UPC Number 652667120074
Release information
Product URL Product Link
Manual URL Manual Link
Has computer interface Other
Firmware Upgrade Possible
Year Released 12/2017
Year EOL
Predecessor PR3
Misc Details
Height 27 mm2.7 cm <br />0.027 m <br />1.063 in <br />0.0886 ft <br />
Length 95 mm9.5 cm <br />0.095 m <br />3.74 in <br />0.312 ft <br />
Width 67 mm6.7 cm <br />0.067 m <br />2.638 in <br />0.22 ft <br />


The PR4 is an upgrade to the PR3. It is faster and smaller than its predecessor. It was later packaged with a power supply and branded as the PR4 Xtra.


The PR4 is a LocoNet device that allows downloading of sound files to a Digitrax sound decoder, or reflashing the firmware. It also acts as an interface between LocoNet and a computer. It uses a USB 2.0 interface to a computer. It replaced the PR3.

The PR4 was rebranded the PR4 Xtra, which includes the power supply.[1]

See LocoNet Page for more information on this and the PR3.

PR3 with PR4 demonstrating size difference


  • Multifunction USB to LocoNet
  • Optimized for Direct mode, up to 3 times faster than PR3
  • Electrically Isolated between USB and LocoNet
  • Digitrax “SoundLoader” compatible. Loads Digitrax sound projects to SFX decoders
  • Programs CVs for most DCC decoders
  • LocoNet MS100 mode
  • Automatic configuration
  • Standalone operation for CV and SoundFX programming without a Digitrax Command Station
  • LED status indicator lights
    • Blue LED indicates USB connection is active and PR4 is in LocoNet mode.
    • Flashing blue LED indicates it is in programming mode.
    • Red and Green Status LEDs used for resets and other processes.
  • Firmware updates available from Digitrax Web site.
  • Includes PS14 Power Supply
  • Mac OS with JMRI
  • Windows XP, Vista, 2000, 7, and 8

It requires a programming track.

The PR4 does not provide RailSync power or LocoNet termination when used in a standalone LocoNet situation.

For better results, an 18V power supply is recommended. For use with Digitrax multifunction decoders the PS14 power supply is recommended.[2]


See PR4 Webpage

Power Supply

The PR4 Xtra comes with a power supply.


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Related Digitrax Other DCC Equipment Items

  1. The PR4 did not originally include a power supply.
  2. Some Digitrax multifunction decoders may be damaged by voltages other than those provided by the PS14.