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RS485



 
 
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  #1  
Old November 29th 04, 08:06 PM
Erik Janssen
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Default RS485

Hello,
I need to connect some units with RS485 and in the user guide I have found
the following text regarding the cable to use:
"Wire gauge size is thicker than AWG #22 (0.33 mm2)."
I wonder what "AWG" is, is this a kind of a cable or specification?

Best Regards
E


  #2  
Old November 29th 04, 08:18 PM
Tom Woodrow
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Default

AWG = American Wire Gauge, and RS485 should use twisted pair cable. Each
end should be terminated with a 120 ohm resistor (not each node, each end).

Tom Woodrow

Erik Janssen wrote:
Hello,
I need to connect some units with RS485 and in the user guide I have found
the following text regarding the cable to use:
"Wire gauge size is thicker than AWG #22 (0.33 mm2)."
I wonder what "AWG" is, is this a kind of a cable or specification?

Best Regards
E


  #3  
Old November 29th 04, 08:43 PM
Erik Janssen
external usenet poster
 
Posts: n/a
Default

Hello,
If I understand correctly, what I need is twisted pair cable with a minimum
size of 0.33mm2?

Best Regards
E

"Tom Woodrow" skrev i melding
news:PBKqd.118208$5K2.72837@attbi_s03...
AWG = American Wire Gauge, and RS485 should use twisted pair cable. Each
end should be terminated with a 120 ohm resistor (not each node, each
end).

Tom Woodrow

Erik Janssen wrote:
Hello,
I need to connect some units with RS485 and in the user guide I have
found the following text regarding the cable to use:
"Wire gauge size is thicker than AWG #22 (0.33 mm2)."
I wonder what "AWG" is, is this a kind of a cable or specification?

Best Regards
E



  #4  
Old November 29th 04, 11:35 PM
CBFalconer
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Default

Erik Janssen wrote:

I need to connect some units with RS485 and in the user guide I
have found the following text regarding the cable to use:
"Wire gauge size is thicker than AWG #22 (0.33 mm2)."
I wonder what "AWG" is, is this a kind of a cable or
specification?


American Wire Gauge. That sounds like a fairly large wire size to
use, I would expect 24 or even 26 to be adequate for the purpose.


--
Chuck F ) )
Available for consulting/temporary embedded and systems.
http://cbfalconer.home.att.net USE worldnet address!


  #5  
Old November 30th 04, 12:06 AM
Tom Woodrow
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Posts: n/a
Default

Depends on the total length of the run.

CBFalconer wrote:
Erik Janssen wrote:

I need to connect some units with RS485 and in the user guide I
have found the following text regarding the cable to use:
"Wire gauge size is thicker than AWG #22 (0.33 mm2)."
I wonder what "AWG" is, is this a kind of a cable or
specification?



American Wire Gauge. That sounds like a fairly large wire size to
use, I would expect 24 or even 26 to be adequate for the purpose.


 




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