KSerial Interface Wiring

The RS-232 Serial interface port can be used to time and count laps with a minimum of external electronic circuitry. The wiring diagrams below illustrate the basic schematic required.


KDB-25 Connector

The first wiring diagram illustrates the interface cable required to build an interface that will work with the larger DB-25 connector found on many personal computers





KDB-9 Connector

The second wiring diagram illustrates the cable required to build an interface that will work with the smaller DB-9 connector found on many lap top computers.





KThe photo-cells in the wiring diagrams above are available at any Radio Shack retail outlet for less than $2.00 each. Ask the clerk for RS Part No. 276-145. Purchase one photo-cell for each lane on your raceway. The longer lead (Emitter) is connected to the common signal ground (Pin 5 or 7).


KLane Assignments

The table below lists the lane number/pin assignments for the Serial Port connectors


Track        DB-25        DB-9

Lane 1        Pin 8        Pin 1

Lane 2        Pin 22        Pin 9

Lane 3        Pin 6        Pin 6

Lane 4        Pin 5        Pin 8


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