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Real RS-232 Cable Length Limit
- Thread starter danielthb
- Start date
Sure.
Oh..
40pF/foot... That sucks.
Maybe not. If it doesn't, it's your crummy cable.
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.
Keith Cress
Flamin Systems, Inc.-
Oh..
40pF/foot... That sucks.
Maybe not. If it doesn't, it's your crummy cable.
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.
Keith Cress
Flamin Systems, Inc.-
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.
Dan
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.
Dan
controlsdude
Electrical
If you use this cable spec you can get 500 ft distance. experienced it myself.
Black Box EDDC
but on the - side it is expensive.
Black Box EDDC
but on the - side it is expensive.
controlsdude; You experienced it at what speed?
Keith Cress
Flamin Systems, Inc.-
Keith Cress
Flamin Systems, Inc.-
controlsdude
Electrical
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.
MikeHalloran
Mechanical
I don't think you'll do 9600 at 175' over STP.
Current loop should work okay.
Mike Halloran
Pembroke Pines, FL, USA
Current loop should work okay.
Mike Halloran
Pembroke Pines, FL, USA
Well Black box said 500ft.
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.
Keith Cress
Flamin Systems, Inc.-
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.
Keith Cress
Flamin Systems, Inc.-
controlsdude
Electrical
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.
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