Millisecond accurate USB response pad rear connectors
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Depending on your exact model of USB response pad it will have a range of connectors on the rear.

All models come with a USB connector to connect to the computer running your psychology experiment; 4x 3.5mm external button sockets should you wish to use external buttons; a 2.5mm TTL socket that sends a marker when any button it pressed; and finally a BBTK socket that enables the response pad to connect to a BBTK v2 at the same time as your computer so that both receive exact timings. The 9-way BBTK socket can also be used to give individual TTL event markers for the four primary buttons.

Depending on model a second 9-way D can provide either 4x Active Switch Closures (ASC) which can close a button on a remote device or between 1-8 TTL event markers tied to each button. Event markers for buttons provide a unique +5V TTL signal for each button whilst held down so that you can record exact button down, duration and release times.

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Rear connectors


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Connector What does it do How can I use it
ASC or Active Switch Closure
(male 9-way D connector)

(Depending on model this may be labelled 8x TTL)

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.

Depending on model the ASC port may be replaced with a dedicated TTL port mapped to each button press.

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.

If using a model with a dedicated 9-way TTL connector this is ideal for event marking of true individual button response times or for time audit, e.g. in EEG, connection to a BBTK etc.

TTL
(2.5 mm stereo socket)
When a button is pressed a 50ms 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
(3.5mm 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 3.5mm 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.