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Author Topic: RS232 connections  (Read 466 times)
KB5DPE
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Posts: 298




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« on: March 24, 2007, 03:00:23 PM »

This may seem trivial but I like to do it right.  I need to build an RS232 cable (DB25) for a project and am wondering which wire is used as the "signal ground" and which is the "protective ground"; choices being the shield wire or the black wire inside the shield.  I know, from a practical perspective, either will work, I've cobbled them together many times before, but I'm wondering what the industry practice is.  For this application I want to be sure to eliminate ground loops, etc.  Does anyone know what the "gurus" do?  Thanks for your help.
73 Tom  
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W3LK
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Posts: 5639




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« Reply #1 on: March 25, 2007, 10:47:33 AM »

Black is generally the signal ground. The shield is just that, the shield. It is almost always connected to the chassis ground.

73,

Lon - W3LK
Baltimore, Maryland
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KB5DPE
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Posts: 298




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« Reply #2 on: March 25, 2007, 12:57:55 PM »

Thanks, Lon.  Exactly what I needed.
73 Tom
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