On Monday 12 June 2006 13:15, Mark Allyn wrote: > Nikolaus: > > Thanks for the suggestion. > > The DMX serial protocol that I am using uses a packet of 512 words > that it sends out at once. There is no need for an address field > as each packet sent out ever the line has all 512 words (8 bits each). > > This is done to eliminate the need of having address bits. Each light > in a DMX system (which, by the way is used in most modern theatres > and concerts; especially the big rock concerts) is programmed to > use a particular byte of that 512 bytes. > > The one thing that I did not mention in my email is that I am > hoping for a 512 KBPS bit stream on the line so that I can > update the brightness of each LED at least 60 times per second. > A 9600 baud line would be too slow. > > Looking at the RS485 hardware specs, they say that it can run > up to 1 MBPS for the distances that I am looking at (up to about > 2 meters for a piece of clothing). It also has a fan out limit > (transmitter to receivers) of about 32. That is show stopper > for me. > > Perhaps I can make 'repeaters'; a RS488 receiver connected to a > RS488 transmitter on a small PCB. I was hoping to avoid this. > > Truly, > > Mark Allyn Have you considered the Dallas One-Wire stuff?
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