2017-06-17 20:15 GMT+03:00 Andrew:
> 2017-06-17 18:34 GMT+03:00 Danny Miller:
>
>> Similarly the inputs aren't true differential, they're an optoisolator's
>> input diode with a series resistor to produce the rated trigger current
>> when +5v is applied + to -. Due to some esoteric details in how the bus
>> switch drive output works, these work best if you tie the + to +5v and use
>> the pin to drive the - to gnd. The signal is weaker if you do it the other
>> way.
>
>
> Thanks for the tip!
> I was going to try the weaker way.
> If there's a series resistor, it's safe to drive full 5V between /RX and
> RX.
> 7i47s has GND and 5V pins near RX terminals, pretty handy to connect
> either way.
>
> Well today I spent a couple of hours trying to get that alarm signal to
7i47s
This was my basic idea
[image: Вбудоване зображення 1]
This connection IIRC caused flickering LED (with termination jumper off).
I tried replacing RX and /RX wires, still nothing.
It doesn't look like there's an optocoupler input between RX and /RX...
Also I tried experimenting with RX0 input and I think something's got
broken, because now I can turn it on/off with termination jumper
left/right. Other inputs doesn't work like this.
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