175 cable feet of STP between a PC comm port and the DCE--think it'll work at 9600, at 19.2k? I'm not looking for what the specs say but what your experiences are. Cut sheet for the cable says 40pF/ft @ 1.0 MHz.
It's a hard call really as it also depends on your electrical environment. I would imagine 9600 would be dependable. Maybe 19.2k with good cable. In a benign place.
Hopefully you are driving the cable with nice levels not some laptop with +/- 3V levels.
I doubt there's a commercial cable for this service, so your're talking custom cable. That'll cost ? ?
If it's a dollar a foot plus connectors and labor, $200?
What about a couple 232/485 converters, one for each end, and 200' of twisted pair that you've already got lying around, instead? Far higher probability of it working.
I believe most of interfaces were at 9600, some were 19200, and never above that speed. bar code scanners usually char length= 20 to 50. sometimes scales, conv speed up to 550 fpm, gap between cases 12-15 inches.
They don't say at what baud rate. Might be 300. But I think 175ft is possible. I had about 120 feet that we used all the time for various serial endeavors at speeds up to 34,5k and I don't remember having any problems.
some applications that I did were up to 400 feet and at 9600 baud as far as I remember. It all depended on main panel location and scanner locations. This was with the black box eddc cable.