[Al Skierkiewicz]

Jeff,
As others have pointed out, the PNP version is difficult to interface. It is meant to drive a secondary device such as a light or relay. You could use it to turn on an external NPN transistor through a resistor. The collector of the NPN device then can be used to pull the input to the DSC low. In most cases, I would recommend that this device be replaced with a NPN output device to prevent any possible damage to the DSC by inadvertently connecting it directly to the DSC.