Masterclock Firmware Updates

The latest firmware updates for Masterclock devices are available for download below.  Please contact before updating your device(s). 

Review the firmware update procedure  before attempting to perform a firmware update.

After a firmware update, be sure to set the device(s) to default configuration. This will ensure that new configuration structures are recognized.

Download the latest version of WinDiscovery to take advantage of any new features. Latest Version - 5.4.0

Units may also be shipped to the Masterclock Technical Support Department to perform a firmware update using our return merchandise authorization procedure.

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Latest Versions - 2018/9/29 - Version 4.18.00

Latest Release of Firmware for Listed Devices

  • For all Grand Master Reference (GMR) – GMR1000 and GMR5000

  • For all Master Clock Reference (MCR) - MCR1000 and MCR5000

  • All NTDS-A & TCDS-A, NTD200, TCD200 Displays

  • All NTDS Series clocks - NTDS24, NTDS26, NTDS29, NTDS44, NTDS46, NTDS84, NTDS86, NTDS4626, NTDS4626-3AL, NTDS8646 (includes all single face or dual face models)

  • NTP100 - contact technical support to determine if product can be updated in the field

  • All Countdown controllers – RC500 and RC600

  • NTP100 Series, TCG100 Series (units purchased in 2013 and later with a USB port on the rear panel)

  • All MDN Series clocks

Firmware update procedures for the above listed products


Firmware update file for all TCDS models


2012.10.09 SDK for PCIe-OSC, TCR, GPS


2013.05.31 SDK for TCR1000


2014 NASA File


2014 UDC-RCU v.2.0.6


NTD Series II Firmware v202


MCRPCI and GPS PCI API and Drivers