Summary

The “As RB-820” protocol is a simple yet efficient method of transmitting information to the host. It is directly supported by SuperLab and other programs. It is also emulated on the Lumina MRI response pads and other devices.

Technical Details

The microcontroller inside Riponda keeps an eye on the the status of the keys and sends one byte to the host every time a key is pressed or released. When a key is pressed, a byte is sent. When the key is released, another byte is sent. Each bit within the byte corresponds to a key, allowing a program to know if two keys are pressed simultaneously.

The built-in microcontroller takes care of debouncing the keys if necessary. This guarantees that, when a key is pressed, one and only one byte is sent to the host instead of a stream.

Starting with the RB-x30 generation (e.g. RB-730), the response pads include a more advanced protocol called XID that provides built-in timing and other features. However, Cedrus remains committed to including the “As RB-820” protocol in its response devices because it is supported by a number of products. It is also easier to program for if you are writing your own code.

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Last Revision: Jan 19, 2023