In SX Microcontrollers, SX/B Compiler and SX-Key Tool, pwillard wrote:

You treat it the same as an open collector pin on a TTL chip.  This means you need to do what it takes to bring the input pin on teh Stamp to a logic "1" when coupler isn't active and "0" when the transistor turns on.  You might try a value between 4.7K and 10K tied from the collector on the coupler to Vdd and 200 ohms from there to the Stamp iput pin.  The emitter on the coupler would be tied straight to logic GND (Vss).

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