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« on: April 21, 2010, 12:40:47 PM »
Rich,
Attached is a schematic that may provide a starting point for you.
It's a quick mod of the circuit I use to connect an active high probe and 2 active low touch plates to Mach's probe input.
My BoB uses TTL inputs, I converted this diagram for your +24v input case (so I
This will match up with the TTL interface levels for the probe.
Not knowing what levels you tool setter outputs, you may need to make some more tweaks. The touch plate inputs in the diagram are TTL.
The idea here is to convert all inputs to active low, tie them together and use a single pin in mach that is configured active low.
When any input is active, it pulls the BoB input to Gnd and hence creates the active low input event for Mach.
Dave