Hi Karl

Thank you so much for your help.

I will experiment using the me= thods in your example.

To be clear about the use of slots. It seems to work exa= ctly the same as a package with multiple devices in it. I always thought th= at was how it was done.

The devices in the package do not have to be identical.= In this case, one might place the actuating (coil) part of a relay in a co= mpletely different part of a drawing, instead of "forcibly attached&qu= ot; to the contacts part of the symbol. Two different symbols, forced toget= her on the same footprint by the fact they have the same refdes, but a sepa= rate slot.

In your example, because there is only one pin in the symbol, althou= gh four physical pins on the package, I take it that is why there is only o= ne pinseq=3D1.

The other thing I need to understand properly is slotdef.

I gu= essed at slotdef=3D2: 11,21,14,24,12,22 because that was the (strange) pin = names in the order they appear on the package. It was just a blind guess, a= nd maybe order is not important, but it seemed to work.

I will try these.
<= /div>My thanks and regar= ds

Graha= m

On 28 August 2017 at 12:53, <karl AT aspodata= .se> wrote:

Graham:
> How does one deal with the symbol for a component tha= t has more physical
> pins than symbol pins, because internally some are strapped together? = I
> have searched through the Wiki help for some time, looking for a clear=
> example, but not yet seen how to do it.
> Some power semiconductors use extra pins, as do many relays.

=C2=A0example:
http://aspodata.se/git/openhw/share/= gschem/mechanical1.sym
http://aspodata.se/gi= t/openhw/share/pcb/_mechanical/fibox_tempo_TA191209T_4p.fp
The sym has one pin with pinnumber=3D1.
The fp has four pins with number parameter eq. 1.

The pcb pin def.:
=C2=A0Pin [rX rY Thickness Clearance Mask Drill "Name" "Numb= er" SFlags]

All pins/pads in pcb with the same "Number" will be treated as on= e and
the same thing.

> An example is a simple changeover switch relay where there are 8 pins<= br> > altogether.
> Two of the pins can be for the coil, and given a slotdef=3D1. That par= t is
> easy.
>
> The remaining 6 pins, using slotdef=3D2, are arranged such that each i= nternal
> element uses up 2 pins, strapped together internally.

I haven't seen slots used like that, isn't slots for compone= nts that
have multiple _identical_ parts, like a four op.amp. chip ?

In your case you only have one thing consisting of two _different_
parts in the package. Since you already have two sym's, just remove
the slotdef attribute and you'll be fine.

> This is where I need to understand how, (or whether) a single gschem s= ymbol
> pin can be actually served by more than one pin in the footprint, and = know
> how to arrange pinseq. I have spent some time adding the attributes to= the
> example, though I suspect my arrangement might be done better
>
> The example I include does work, but it would be nice to simplify the<= br> > symbol to have only 3 connections, while the associated footprint has = 6
> pins connected as 3 pairs.

Remove the redundant pins in the sym and let the internally connecte= d
pins have the same "number" parameter.

Regards,
/Karl Hammar

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