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R-Bus is a modification of the XpressNet Protocol used by Roco, with commands specific to Roco devices. Allows 20 modules with 8 inputs (160 in total) divided into two groups of 10.

Essentially the same as XpressNet, using 1 start bit, 9 data bits, 1 stop bit and no parity, at 62.5 kilobits/second. It uses the LMAB convention for the connections. It can also use a specific RJ12 connector.