I'm trying to diagnose the signal sent to the red and blue cables on this board :



I am trying to use a logic analyzer but have no idea what type of signal I am looking for. Any help would be extremely gratefully received.

 

I'm trying to diagnose the signal sent to the red and blue cables on this board :

View attachment 293761

I am trying to use a logic analyzer but have no idea what type of signal I am looking for. Any help would be extremely gratefully received.

Are red and blue, two distinct outputs? try doing some basic observation on a scope, look at the two signals together (use a two channel scope), get some idea of the basic characteristics like amplitude, some idea of frequencies or periods etc.

 

I'm trying to diagnose the signal sent to the red and blue cables on this board :

View attachment 293761

I am trying to use a logic analyzer but have no idea what type of signal I am looking for. Any help would be extremely gratefully received.

Are either of the connections connected to GND (or VCC)?

 

I'd even initially suspect that the red/blue wires are in fact power, but from the phrasing of the question it seems not.

 

Give us a clue as to what this board does. It looks like the signal goes to some sort of signal conditioner circuit before going to what looks like a Intel digital device chip with 8 bit latches.

 

It looks like an input signal to a CNY optocoupler, with a diode across the input, so it may be a low voltage AC or DC.

 

this is the signal data, I believe it should be sending 16 digits [0-9]

 

Its a Scoreboard for a Cricket Club

This is the control unit at the other end of the cable.

 

Are red and blue, two distinct outputs? try doing some basic observation on a scope, look at the two signals together (use a two channel scope), get some idea of the basic characteristics like amplitude, some idea of frequencies or periods etc.

I think there is only one output

 

Are either of the connections connected to GND (or VCC)?

i think the red one is vcc but im not sure

 

it appears to send data every 5 ish secs

 

Red and blue cable is one signal input to pins 1 and 2 of an opto-coupler.