FarSync BERT Tester software

Current software release for the FarSync BERT Tester product: Version 4.1.0

Changes from previous released version

Version 4.1.0

  • Major improvements to the handling of customer specified test patterns including: user patterns up to 64Mb, no byte alignment requirement for test patterns, improved performance in the handling of larger patterns
  • More sample applications for using the BERT API, they now include apps written in: Python, C# and VBS as well as LabVIEW
  • Improved handling of multiple instances of FarSync BERT (for multiple lines in test) when using the BERT GUI or BERT API
  • Support added for the control of DTR and RTS signals on test commencement and the toggling of these lines during a test. Control is also available through the BERT API
  • Improved accuracy of PRBS error count rates and fast error rate reporting
  • Correction to the test length used when the LENGTH value is configured in the range 10^4..10^8
  • Increased resolution in BertClient's command line output - now in E notation
  • Support for time-limited tests of more than 504 seconds
  • Support added for the handling of custom clocking rates
  • Fixed focus switching between windows in Windows 10
  • Enabled multiple properties to be set via the BERT_API after the test has been started
  • Improved synchronisation support at speeds lower than 4800 baud when hardware mode is selected
  • Increased validation of user inputs when using the GUI
  • Resolved Plug and Play issue when FarSync BERT is running as a multidrop slave device
  • Fixed an issue with RS485 multidrop specific synchronisation support
  • Now allows user pattern filenames with spaces in the name and/or path
  • Enable ERR injection support in FarSync BERT HS Tester-USB in LOS state - previously synchronisation was required
  • Ensure LOS Rate is reset to 0 when synchronisation is made


  • Updates to the driver to provide compatibility with the FarSync Flex V3
  • fsbert install package has been signed
  • BertClient in the LabVIEW folder updated
  • fsbertif.dll has been enhanced to detect more reliably the end of a test
  • firmware update to correct an issue of false reporting the LOS signal under some test conditions
  • added firmware support for native clock rates 200Khz and 10.71Mhz


  • Support for the use of User Test Patterns
  • Support for testing devices/cabling on Multi-Drop networks
  • Support for testing Round Trip Delays
  • Support for bi-directional clocking

Version 3.0.0

  • Support for hardware-based BERT operation.
  • Support for line rates up to 16Mbps.
  • Support for both 32 and 64-bit LabVIEW.
  • Add global reset to defaults menu option.
  • Rationalisation of UI with respect to colours and error/information dialogs.
  • A range of performance enhancements.

Version 2.0.4

  • Terminal Timing support for V.35.
  • NRZI Clocking is supported when using a Flex V2 device.
  • 4-wire, point-to-point RS485 operation corrected.
  • Corrected persistently starting/stopping a test causing the port to be unavailable for a short periods.

Version 2.0.3

  • PCIe version now in addition to the USB version.
  • Manchester and Conditioned Di-phase encoding is now supported.
  • Terminal Timing is now supported.
  • 4-wire, point-to-point RS485 is now supported.
  • Data Inversion supported.
  • Support for all patterns in all Async data formats (e.g. character lengths).
  • Native configuration support for all port properties directly from the BERT GUI.
  • Audible alerts have been introduced.
  • Line errors (FRAMING, PARITY) are now reported.
  • The LabView API has been extended to include all options now available in both GUI and script mode.

Download Request Form

To be able to download this latest software release, please fill in this download request form. Once your request has been approved, you will be contacted by email with details on how to obtain the software.

Note: all fields are required.