On Sunday 25 December 2016 06:04:51 Nicklas Karlsson wrote: > > > ... > > > > You are right, ribbon cables are not very good at carrying signals > > over long cables. They will pick up too much noise if not shielded > > and suffer often from significant cross-talk if too long. > > A trick is to put ground in half of them, either odd or even. Then of > course they get twice as expensive. > > > The "standard" old-school printer cables (the round ones) are often > > shielded and twisted pair, which are actually quite good. > > Twisted pair is the best. > > > > For over 30 feet use some kind of differential signaling or fiber. > > > > Differential signaling or fiber is of course better, but very much > > more expensive. You will also need to convert the signals on each > > end. > > Differential signal is the best but I do not how big difference will > be against ground in one of the pins instead. For signal conversion I > think RS-422 transciver/receiver is the choice, they are also readily > available in different speeds. Ethernet cable is twisted pair and > readily available. > In this case, we are talking about a data rate (baud) in the 32 MHz range. I have some 422 adaptors, intending to play with them at some point, but have doubts they can run that fast as they are usb driven from the computer.
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