RS Components export site are showing 335 available.
DLP Design - DLP-IO8-G - Data Acquisition 8 channels Analogue Digital Input, DLP Series - RS (rs-online.com)
Do you have virtual serial port software (e.g. Eltima Virtual Serial Port), a decent RS232 to USB adaptor and a DLP-IO8?
I do have a solution, but it's a bad hack and not something I'd release public just yet. From time to time I circle back to it and make improvements.
FWIW I just run my wideband 0-5V to the DLP. If you go that way, observe good power, grounding and signal practices and it'll work just fine.