If you will enter the board data manually, instead of translating CAD files, prepare the schematic diagrams.
1 Assign pin numbers.
a Assign pin numbers (1 and 2) on two-lead components, such as resistors, inductors, and capacitors, that do not normally have any pin distinction.
You can use a blank PC board and an ohmmeter or continuity light to follow traces to help determine pin numbers.
b Write the pin numbers on the schematic diagram.
Device pins up or to the left are labeled as pin 1, device pins down or to the right are labeled pin 2 (see Figure 1).
2 Assign electrical node names.
a Assign a name to each electrical node in the circuit.
b Assign node names to all unused device pins. This is important for shorts and opens testing and future considerations.
c Write the node names on the schematic diagram.
Figure 1 Device pin numbering
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