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On the front panel of Bitscope is a DB-25 logic POD connector. It provides an interface to the 8 logic inputs. It is here you connect Bitscope's logic analyzer to the circuit under test.

In addition to the logic inputs, the POD connector also provides access to Bitscope's analog inputs, power and ground lines, and 2 special I/O signals, as the schematic shows.

It is these additional signals that give Bitscope some unique hardware expansion capabilities.

For example, it is possible to connect another Bitscope in cascade with the first to double the analog and/or digital inputs available without requiring a second serial connection.

You can also connect a "Smart POD", powered by Bitscope, to do clever things Bitscope can't do on its own.

For some examples of Smart PODs now available check out ProtoPOD and WavePOD each of which demonstrate some of the possibilities.

There are two methods of communicating with POD devices, be they additional Bitscopes or Smart PODs, protocol pass-through and slow byte exchange.