The SIGNAL command is used to define signals (connections between the various packages). The user must define a minimum of two element_name/pad_name pairs, as otherwise no airwire can be generated.
To do that you select (with the mouse) the pads (or smds) of the elements to be connected, step by step. EAGLE displays the part signals as airwires in the Unrouted layer.
If input with signal_name the signal will be allocated the specified name.
Signals may also be defined completely by text input (via keyboard or script file). The command
SIGNAL GND IC1 7 IC2 7 IC3 7;connects pad 7 of IC1...3. In order to enter a whole netlist, a script file may be generated, with the extension *.scr. This file should include all of the necessary SIGNAL commands in the format shown above.
If the SIGNAL command is used to connect pads (or smds) that already belong to different signals, a popup menu will appear and ask the user if he wants to connect the signals together, and which name the signal should get.
The special signal name _OUTLINES_ gives a signal certain properties that are used to generate outlines data. This name should not be used otherwise.
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