Electrical connectivity

As you draw schematics you need be aware of what is considered to be electrically connected by the gEDA programs.

Nets which are visually connected to other nets are electrically connected. This connection may be endpoint to endpoint or endpoint to midpoint. When a single endpoint to endpoint (net or pin endpoint) connection is drawn then the visual dangling net cue disappears. When an endpoint ends in the middle of another net (or multiple endpoints coming together at a single point) then a circular filled connectivity cue is drawn. You cannot connect a net to the middle of a pin. Nets can only be connected to the endpoints of pins. You cannot connect to a net if that net is not orthogonal (horizontal or vertical). The visual cues are the primary way of telling if nets/pins are connected.

Bus are similar to nets with the exception that you cannot connect a net to the endpoint of a bus (only to the middle). If you do try to connect a net to the end of a bus you will see a big red X at the invalid endpoint connection. Buses are still very new so there are still many quirks.

You can label nets by using the label= attribute. Do not attach more than one label= to a net. You only need to attach the label= attribute to one net segment. Different nets (i.e. multiple net segments which aren't connected together) which have the same attribute label= attached to them are also considered electrically connected. You will not get any indication of this connection by gschem, but the netlister (gnetlist) considers nets with the same label= attribute electrically connected. The naming convention for buses has not been formalized yet.

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