Open source hardware GPIB USB adapter update

in open source by DP | 3 comments


Steven Casagrande posted an update on his open source hardware GPIB USB adapter:

After many days, I just finished off firmware version 5 for my adapter. This is probably my biggest update yet. A lot of people asked for compatibility with the Prologix commands so that’s what I focused on. Here is an overview of the new firmware:

  • Nearly all Prologix command set support. The adapter should now work with some pre-existing software tools and examples on the internet that were originally intended. Some will require a few changes for baud rate and flow control settings
  • Improved termination character handling
  • SRQ support (but no parallel polling, only serial)
  • Improved stability
  • Device mode (first version so there may be fixes in the future)
  • Most settings can be stored in EEPROM
  • Basic FIFO buffer for data sent from the PC

Via the forum.

This entry was posted in open source and tagged , , .


  1. Drone says:

    Progress on Prologix compatibility – sweet! We need some testing with the KE5FX GPIB Tool Kit by John Miles found here:

    Regards, David

    • So it works and it doesn’t at the same time. It found that his software requires the use of the RTS/CTS hardware control lines by default. In addition, it is set to use a different baudrate.

      Both problems can be fixed by recompiling his software. In addition, the baudrate problem can be fixed by playing with a registry key used by the FTDI driver to map the baudrates. I think you can also make an entry in a config file for the toolkit for the baudrate part. I haven’t tried that one though.

      The biggest though is the RTS/CTS requirement. I’ve been in contact with John about the issue and I recommended he add an option to not use those control lines.

  2. Kaz says:

    Sweet! I might see if I can get one of these now that there’s some progress on device mode.

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