USB
The USB port can operate in one of two modes: Keyboard or Standard:
Several protocols (data formats) are supported and can be selected from the front panel. Supported baud rates are 115200, 57600, 19200, and 9600.
Timing
To get around delays inherent in USB drivers, the controller can send time-stamped information in both Keyboard and USB Serial modes. The timer can be reset via a light sensor or an external TTL signal. In USB Serial mode, the timer can also be reset via a command sent over USB.
Trigger Input
The controller provides two methods for accepting triggers from fMRI scanners:
Minimum pulse duration is 7μs and minimum gap between pulses is 400µs.
A version of the Lumina controller is available that offers optical isolation. This guarantees that no unwanted electricity flows between the controller and your MRI scanner. When optically isolated, the input needs nominal 5mA and a minimum of 1mA. The input has a 100 Ohm resistor to limit the current to about 30mA if the source is not current limited.
m-pod Connector
The controller is compatible with Cedrus’ range of m-pod devices. This allows the controller to send event markers to a recording device of your choice, e.g. EEG or eye tracker. The following signals can be marked:
Firmware
XID, or eXperimental Interface Device, is technology first used by Cedrus in 2001 on Lumina’s first generation controller and later adopted on all Cedrus hardware products. The current 3G Lumina controller’s firmware implements the XID 2.0 platform. The firmware is upgradeable.
Power Requirements
The Lumina controller ships with a medically rated, UL-60601 certified AC adapter. It accepts 100-240VAC, 50-60Hz input, and produces regulated 9VDC, 2.0A max. CE certified.
The response pads are made from 100% plastic and fiber optics.
Here are the dimensions for the more popular PAIR model:
The optional Copper Outpost allows the Lumina controller to recognize two Lumina response pad sets instead of just one, allowing for a maximum of eight buttons.
The Copper Outpost can sit on a desk or be wall mounted. Its power is provided by the controller; no separate AC adapter is needed.
The light sensor is available in two colors: black and white. Notches are molded in on three sides to allow for easy positioning on the screen. The controller can be configured so that detection of light can reset the built-in timer.
The response and release times are dependent on the amount of light.
The light sensor is small, measuring only 8mm (W) by 20mm (L) including the wire’s strain relief.
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