Re: gEDA-user: gschem: how to indicate shields, twisted pair?

[James Moody <moody@xxxxxxxxxx>]

Thanks for the tips, John. My schematics for the cables are simply for 
documentation, no net-lister involved.

So, since this is just for pretty pictures, anything I make from the 
primitive shapes should be OK.  I just didn't want to start my own 
conventions if accepted conventions already existed.

 --Jim


John Doty wrote:
>> I've just started to use gEDA.   My initial project includes both PCBs
>> and interconnect cabling.  In cabling you often have twisted pairs and
>> shielding that must be indicated, is there some way to indicate  
>> this in
>> gschem?
>>     
>
> It depends a bit on how you intend to use the results. We don't have  
> a netlister that's intended to represent cabling, although I suppose  
> you could make use of the output of one of the printed circuit ones.
>
> If it's just graphics you're after, you can just draw whatever you  
> want, and not worry how it will connect.
>
>   
>> What I've used in the past:
>>
>> For shields: An oval representing a shield, surrounding the group of
>> wires that are enclosed in the shield. A connection from the oval to a
>> pin on the connector, this is the shield drain wire.
>>     
>
> You could make a one pin symbol for your shield, similar to the  
> ground and power symbols. It's probably easiest to start with one of  
> those and edit it to look the way you want. Change the name in the  
> net= attribute to "SHIELD" or something. That will make the correct  
> connection in the netlist, if you need it.
>
>   
>> For twisted pair: The connections were drawn as a criss-crossing  
>> pair of
>> wires for part of the way between connections.
>>     
>
> You can make an "X" of wires by drawing short net segments and  
> dragging their ends around. Then duplicate and stack as many of those  
> as you want. The segments don't, by default, connect where the cross,  
> but they will connect where ends touch.
>
> John Doty              Noqsi Aerospace, Ltd.
> http://www.noqsi.com/
> jpd@xxxxxxxxx
>
>
>
>
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>   



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