The above schematic shows a typical connection of 5 normally closed switches. These switches are connected
between input lines 1-5 and ground. Lines 6-8 are connected directly to ground with jumper wires. All external
connections shown are made through the Input connector on the back of the Signal Generator. This resistor pack
(RP41) is socketed so that you can change the value if needed for your application.
The input lines are all optically isolated. In this example, JP84 and JP85 are shorted using the internal power
to source the external side of the optical couplers. However, for the best isolation, JP84 and JP85 should be
open, and power should be provided through pins 23 and 25 of the DB25 Motor Signal connector. Input lines
1-4 and 5- 8 are internally connected to pins 15-18 and 5-8 respectively of the DB25 Motor Signal connector.
Note that the FlashCut CNC limit switch kit has the same wiring as shown in this example.
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