How do I use wired TTL triggering with 1- and 8-bit cables?

In our standard package you get cables that allow PRO line devices to receive wired triggering through TTL protocol.

 PRO device (32channel) only supports 1-bit triggering, while PROX (64channel) has both 1-bit and 8-bit TTL input.

TTL triggers are physical input triggers, so they get recorded alongside EEG data in all file formats (whether you record PC files or directly on device memory).

To visualize TTL triggers in mbt software, you need to enable the TTL toggle in Settings.

1-bit trigger

All PRO line devices have 1-bit TTL input on the EEG cap. This cap input is in the form of a 2.5 mm audio jack.

Tip of the audio jack is the Receiver line (Rx) and the middle is the Transmitter (Tx). You could customize the other end of the cable, depending on which system you use for sending TTL triggers. To produce a trigger, you can simply short circuit tip and middle - using a simple button for example.

You can send TTL triggers using Neurobs Presentation, Chronos + E-Prime, Tobii eye-glasses and many other systems. 

If you have the standard package, on the other end of the TTL cable there's a USB connector. You can connect the cable to a PC and send triggers from a COM port using software. The port settings are as follows: 

8-bit trigger

The input is located at the bottom of the PROX cap casing. You can see the connector type + cable in the image below. The plastic tip indicates on which side to insert the cable. On the other end, by default you have a USB connector, which means you can also send 8-bit TTL triggers using tools that were mentioned previously. 

The COM port settings for 8-bit triggering is shown here: