With what little I understand about DMX, it looks good. I saw termination mentioned as a frequent issue, with some devices having switchable termination. (In case the cable already contains a terminator.) There's a scary statement on http://thedmxwiki.com/definitions/dmx_terminator
"If the addition of a terminator causes problems in your chain, it is likely down to poor quality DMX Cable." But I guess we don't want to go into such things and people should simply use unterminated cables with M1. The SN75HVD12 data sheet shows a mysterious little NAND gate between nRE and DE but never mentions what this is supposed to do. I guess if it was something particularly nasty, we'd know by now :-) On MIDI in, I'm surprised by the value of R54. Does it really have to be only 120 Ohm ? 3.3 V/120 Ohm = 27.5 mA. That's even above If(avg) = 20 mA from the optocoupler's Absolute Maximum Ratings. (Page 2.) The values they suggest on page 6 all are considerably larger. Last but not least, the IR sensor. We're cutting it close to the recommended value of "C1 > 0.1 uF" with C126 = 100 nF, but I guess nobody is that pedantic :) - Werner _______________________________________________ http://lists.milkymist.org/listinfo.cgi/devel-milkymist.org IRC: #milkymist@Freenode
