The “As RB-820” protocol, formerly called RB Series response pads 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 RB Response Pads and other devices.
The microcontroller inside the response pads 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. In other words, 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.
One limitation to this older protocol is that, on Lumina 3G controllers, only the buttons from “Response Pad 1” can be reported. Buttons on “Response Pad 2” go unreported.
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.
The Lumina controllers all 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: Nov 21, 2016
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