Peter C. Wallace wrote: >>$300, using pluggable terminal strips ;) > > > > Heh, We told Digikey the Avnet price and they came down to ~10.00... > > For a parallel port replacement Ethernet, maybe a thing to consider is just a > single point to point link to the (multi axis) endpoint and some very simple > master slave protocol. The slave would get a packet, unpack to hardware > registers, and echo a new packet or return data. Yes, but it has to have a real time driver module, that's the problem. And, it would require two ethernet ports on the system, if you wanted to also be on the local network. > > I've been thinking of doing this with a low cost FPGA card like the 7I43. > Just > replace the USB interface with a LM3S8933 or something (Nice because it has a > built in PHY and IEEE 1588 (no speed demon though)) For what I want to do with t, it has to be pretty fast. I'd want to leave the possibility it could run at a 10 KHz servo update rate, otherwise it is a step BACK from the parallel port.
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