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rs432 and shielded twisted pair cabling

Posted on 1998-08-05
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Upto which length i can take RS432 cable and STP cable.Which one is better from cross-talk point of view
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Question by:mohitmatta
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by:joe_massimino
ID: 1122319
Maybe you should say what your doing with the cable.  Twisted pair cable is best for networking, it's not needed for serial communication since serial communication is a totaly different animal.  I did not find any reference to RS432 in my IEEE manual, where did you get it?  
A little more detail from you could go a long way in getting a useful answer here.
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by:warmcat
ID: 1122320
He means RS423.  Mohi, you ought to make up a cable with both, and measure the crosstalk with a 'scope.  The max length you can take your signal and still be able to decode it depends mainly on the driver on-resistance.

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by:joe_massimino
ID: 1122321
The length of your cable depends on the shielding, and operating conditions.  You can only test each to see if it meets your requirements.  The published operating parameters of all cables are based on ideal conditions. Where someone might not think 200 feet would be far for RS232, it is very far when the run is through a Power Plant and three generators running at full power out. If you state the length, and working conditions of your cable we could give you more specific information.
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by:sugdenj
ID: 1122322
Another major factor is data transmission speed.  The faster the data rate, the short the effective distance.
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joe_massimino earned 40 total points
ID: 1122323
How about some feedback on this?

The length of your cable depends on the shielding, and operating conditions.  You can only test each to see if it meets your requirements.  The published operating parameters of all cables are based on ideal conditions. Where someone might not think 200 feet would be far for RS232, it is very far when the run is through a Power Plant and three generators running at full power out. If you state the length, and working conditions of your cable we could give you more specific information.
 

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by:warmcat
ID: 1122324
suggs, you're right.  But the reason that the transmission speed has an impact is that faster bitrates allow for less degradation of the higher frequency components of the edges (ie, less time per bit has less time to allow for degraded slew rates on the edges).  The extent of attenuation of the higher frequency components of the edges on a particular cable is directly related to the line driver on-resistance.
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