Maximum Data Cable Length

hcwong

Dear all,

Kindly point out to me what is the maximum allowable data cable length for each communication type below:
1) RS232
2) USB 2.0
3) RS485

Thanks.

dandreae

I bet if you type this information·into www.google.com it will come up with the information that you are looking for.

I came up with:

50ft. for RS-232

4000ft. for RS-485

16.4ft for USB 2.0

Dave

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Dave Andreae

Tech Support
dandreae@parallax.com
Http://www.parallax.com



Post Edited (Dave Andreae (Parallax)) : 8/26/2005 10:46:59 PM GMT

steve_b

I concur with the "documented" range for rs232....however, I've got a 200ft cable run at the moment on a shielded cable running at 2400 baud and don't seem to have any problems...
So dropping your baud rate will give you enough head room to stretch the distance out!

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Steve

"Inside each and every one of us is our one, true authentic swing. Something we was born with. Something that's ours and ours alone. Something that can't be learned... something that's got to be remembered."

Beau Schwabe

Speed is going to be directly proportional to cable length. Slower bauds will do just fine, but Higher speeds will get swamped with the "capacitance" induced over long cable runs.

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Beau Schwabe

IC Layout Engineer
Parallax, Inc.

knightofoldcode

Dave Andreae (Parallax) said...
I bet if you type this information into www.google.com it will come up with the information that you are looking for.


I came up with:



50ft. for RS-232



4000ft. for RS-485



16.4ft for USB 2.0



Dave

Note, These values assume no active repeating. With Active Repeating, these distances can be much larger.

Knight.

hcwong

Thanks folks for pointing it out.