Author: ajcord
Posted: 31 Dec 2012 02:38:33 pm (GMT -5)
I don't need to receive any transmissions because DMX is entirely one-way.
So I would send a bit by pulling the ring either high or low depending if I want to send a high signal or a low signal. The tip would be for the input bit, which I don't need because I don't receive any data. Is that correct?
Do you mean that what I output would be fed back to the input bit? Possibly relevant is that the last DMX receiver on the line has a terminator to prevent the signal from being reflected and causing havoc. From what I understand, it's basically just a resistor that weakens the signal to the point that it's less than 0.2v and doesn't trigger a bit change. Would that prevent me from reading what I'm writing?
The 4th and 5th DMX pins are for future use according to the spec, but they are only used in specialty applications. I don't need to deal with them at all. The only ones I'm concerned with are pins 2 and 3 for data transmission (and pin 1 for ground).
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Posted: 31 Dec 2012 02:38:33 pm (GMT -5)
| KermMartian wrote: |
| The input bit will be read-only, and will show you what the other end is transmitting. |
I don't need to receive any transmissions because DMX is entirely one-way.
| Quote: |
| The output bit will be write-only, and it's where you send a bit to the opposite end. |
So I would send a bit by pulling the ring either high or low depending if I want to send a high signal or a low signal. The tip would be for the input bit, which I don't need because I don't receive any data. Is that correct?
| Quote: |
| However, I'm not sure how you avoid reading what you are writing. |
Do you mean that what I output would be fed back to the input bit? Possibly relevant is that the last DMX receiver on the line has a terminator to prevent the signal from being reflected and causing havoc. From what I understand, it's basically just a resistor that weakens the signal to the point that it's less than 0.2v and doesn't trigger a bit change. Would that prevent me from reading what I'm writing?
| Quote: |
| Is there a third transmit-enable pin somewhere? If so, that could be a problem. |
The 4th and 5th DMX pins are for future use according to the spec, but they are only used in specialty applications. I don't need to deal with them at all. The only ones I'm concerned with are pins 2 and 3 for data transmission (and pin 1 for ground).
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