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For encoder units I've seen, their open collector outputs ground the signal
for a logic 1. Cheers Pete Europa builder. wrote in message ... Ron Natalie wrote: : It could go either way... it's just a matter of convention. : *Usually*, a logic value of '1' means high voltage, and a '0' means : ground. : I'm specifically talking about encoders, NOT open collector outputs in : general. All the ones I am familiar with ground on the logic 1. If this is true, then it implies negative assert, no? If it's grounded=='1', then that's opposite convention. Not saying it's not true, but that makes (troubleshooting) sense. : Yes, the encoder is : open-collector outputs, but the reason for diodes is to isolate multiple : devices connected to it. : The diodes may or may not be required depending on what the devices : interface looks like. Believe me, I've had tons of crap in repeaters tied : to a single open collector transitor for the COS and there were no diodes : present. It's not for isolation when all the devices are on, but rather for when one of them is off. If there's more than one device hanging off a single encoder, then they must all be isolated. Otherwise, turning off the transponder could pull all the lines low, and kill the encoder signal for the GPS as well. -Cory -- ************************************************** *********************** * The prime directive of Linux: * * - learn what you don't know, * * - teach what you do. * * (Just my 20 USm$) * ************************************************** *********************** |
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