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nscpl
Joined: 06 Nov 2006
Posts: 13
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 14 Nov 2006 11:45 low-capacitance serial cable |
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Hi all,
Can ayone tell me the communication range of serial RS232 cable from the PC.
Means how much distance from PC is it able to communicate?
Thanks in advance.
Nikhilesh:D
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IanP
Joined: 05 Oct 2004
Posts: 6492
Helped: 1542
Location: West Coast
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14 Nov 2006 12:36 range of rs 232 |
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First of all, the cable length is not specified in the standard ..
However, read this ..
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Maximum cable lengths
Cable length is one of the most discussed items in RS232 world. The standard has a clear answer, the maximum cable length is 50 feet, or the cable length equal to a capacitance of 2500 pF. The latter rule is often forgotten. This means that using a cable with low capacitance allows you to span longer distances without going beyond the limitations of the standard. If for example UTP CAT-5 cable is used with a typical capacitance of 17 pF/ft, the maximum allowed cable length is 147 feet.
The cable length mentioned in the standard allows maximum communication speed to occur. If speed is reduced by a factor 2 or 4, the maximum length increases dramatically. Texas Instruments has done some practical experiments years ago at different baud rates to test the maximum allowed cable lengths. Keep in mind, that the RS232 standard was originally developed for 20 kbps. By halving the maximum communication speed, the allowed cable length increases a factor ten!
RS232 cable length according to Texas Instruments Baud rate Maximum cable length (ft)
19200 50
9600 500
4800 1000
2400 3000
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Regards,
IanP
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14 Nov 2006 12:36 Ads |
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siongboon
Joined: 24 Jan 2006
Posts: 288
Helped: 25
Location: Singapore
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14 Nov 2006 13:35 rs232 cable length speeds |
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The higher the data baud rate runs on the RS232 cable
the shorter the communication length.
I have tried using 115kbps on 16-18m, and was facing few communication error.
No problem face, when using 9600bps so far.
I think there shouldn't be any problem
using 9600bps over a 100m cable length.
The quality of the cable also plays a part.
A shield/coxial cable could help in a more robust communication.
http://www.beyondlogic.org/
http://www.siongboon.com/projects/2006-03-06_serial_communication/
www.siongboon.com
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jayavardhan
Joined: 01 Sep 2006
Posts: 125
Helped: 3
Location: India
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29 Nov 2006 8:17 texas instruments rs232 maximum baud |
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Maximum cable lengths
Cable length is one of the most discussed items in RS232 world. The standard has a clear answer, the maximum cable length is 50 feet, or the cable length equal to a capacitance of 2500 pF. The latter rule is often forgotten. This means that using a cable with low capacitance allows you to span longer distances without going beyond the limitations of the standard. If for example UTP CAT-5 cable is used with a typical capacitance of 17 pF/ft, the maximum allowed cable length is 147 feet.
The cable length mentioned in the standard allows maximum communication speed to occur. If speed is reduced by a factor 2 or 4, the maximum length increases dramatically. Texas Instruments has done some practical experiments years ago at different baud rates to test the maximum allowed cable lengths. Keep in mind, that the RS232 standard was originally developed for 20 kbps. By halving the maximum communication speed, the allowed cable length increases a factor ten!
RS232 cable length according to Texas Instruments Baud rate Maximum cable length (ft)
19200 50
9600 500
4800 1000
2400 3000
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