AVR-Chat

At 01:15 PM 10/22/2004, Doug Locke wrote:


>Hello, wonder if someone could point me in the right direction regarding an
>old line scan camera that I am attempting to control using an AVR. The
>camera supply is +5v and +15v. Basic point is that the data rate and line
>rate signals are just specified as differential line driver signals and
>shown as having a +ve and -ve connection and a comment is made that for slow
>speed access the -ve pin could be biased with +1v and a TTL signal applied
>to the +ve pin. Would I be okay in using a JK flip flop wired to toggle and
>use the Q, Q bar outputs,  maybe just connect each pin to the AVR and toggle
>the lines or should I use say a RS422 driver,. Afraid that I have no
>experience of differential line drivers and appreciate any help in this
>area.

You'll need to know how the data is encoded, but you certainly can do a 
"rude and crude" conversion to single ended like that.  You may need to 
ground the other conductor, depends on how they implemented the interface, 
but I would guess it's about 90% that you will.  Otherwise, it would really 
be a three wire connection, with S+, S- and ground, but "ground" in an 
industrial environment can be pretty amusing.

You'll be better off to go through an "official" conversion circuit though.