How to Use the Parallel Port Monitor Tool

The Parallel Port Monitor tool can be launched by selecting the "Parallel Port Monitor..." command from Inquisit's "Tool" menu.

The Parallel Port Monitor tool allows you to send TTL signals through the parallel port of your choice, as well as monitor incoming TTL signals send from external devices. The parallel port can be useful for testing what kinds of TTL signals are sent or recognized by external devices such as EEGs amplifiers.

Inquisit recognizes TTL input to the Status register. When the "Receive" button is pressed, the Parallel Port Monitor tool displays both the byte value of the current input TTL signal as well as the high/low status of each individual pin. A checked box indicates high; unchecked indicates low.

Inquisit can send TTL input to the Data or Control registers. To send a signal, check the box for pin that should be high, then press the "Send" button. The corresponding pins will be set high or low and will remain in that state until another signal is sent.