TSD116C allows the user to independently mark events, or provide responses, on up to eight channels simultaneously. Because digital channels can be interleaved with analog channels, when using AcqKnowledge, it’s easy to assign separate digital channels as event markers for individual analog input channels.

TSD116D connects to the 25-pin connector on the back of STP100C and ships with a Y-splitter cable to allow the parallel port to be connected to a stimulus presentation system. Terminates in a 25-pin DSub pass-through connector with the ground line (pin 18) of the box and each of the switches wired to the appropriate digital input pin of the DSub connector (pin 2 through 9).