Connector

What does it do

How can I use it

ASC or Active Switch Closure (male 9-way D connector)

When you press a button up to 4x ASC leads can close buttons on your own response device in 0.4 of a millisecond. The small delay is because we use Solid State Relays (SSR) to protect your equipment and they introduce an inherent delay.

If you connected one ASC lead to a button on your own response device when you pressed the corresponding button on the BBTK response pad it would be like pressing the button on your own response device.

TTL

 (2.5 mm stereo socket)

When a button is pressed a 50 ms wide TTL pulse is sent to this socket. This can either be a positive or negative pulse depending on which signal line you use.

This is ideal for event marking of true response times or for time audit, e.g. in EEG, connection to a BBTK etc.

But 1 to 4

 (3.5 mm mono sockets)

Up to 4x external buttons of your own can be used. [physically mapped to buttons 1-4]

When you connect your own push-to-make buttons via the 3.5 mm sockets these work alongside the corresponding response pad button. Participants can press either your external button or our response pad button to make a response.

USB

 (USB 'B' square socket to PC 'A' flat)

Connects to the PC you want to accept responses on.

Each button sends a standard keydown response as might a normal keyboard if you pressed keys 1-8. Therefore you can use keyboard keys 1 to 8 as the response keys.

BBTK

 (female 9-way D connector)

4x TTL lines connect to the BBTK via this connector. If you are using a BBTK v2 when you press a button a +5V TTL event (onset, duration and offset) is captured by the BBTK for time audit purposes. [physically mapped to buttons 1-4]

When connected to the BBTK v2 if a button is pressed a keystroke is sent to the computer you are running your experiment on. Simultaneously a TTL event marker is sent to the BBTK which logs the button press in terms of onset, duration and offset. It is also possible to use these +5V signals to event mark on EEG and for time audit purposes.