Can you use raw binary data instead of the AVT data interface? To be clearer, are you attempting to emulate the AVT852-E and are looking for less costly hardware, or are you willing to work with a direct serial translator instead?
If so, I'll have a 1x/4x capable hardware unit posted here shortly. It'll be atmel based so you can run your current VPW implementation if you'd like, I'm putting the old design through the wringer right now to make sure it'll do what you need it to do. Also, you could simply use the Harris or Fairchild bus interface chips to do the hardware, they're discontinued but available through second-source vendors. I have been pulling them from GM body control modules, they're surface mount so you need to be good with a hotplate.
Also the AVT interface is available directly from AVT, you can buy singles at 250ish dollars each. That's where mine came from.
Bookmarks