The buffer provided by Sunset Models is not needed on diesels, electrics, or steamers when there is a wired connection to the tender. In some cases, the output of the R2LC is inadequate to drive both the IR LED in the tether and still provide a digital signal to the CCM. The directions with the serial buffer require the signal wire to tether be cut and the buffer be put in its place. The directions with the serial buffer indicate what goes where. The reason the engine goes to runaway condition is due to the loss of the serial signal. Adding the buffer ensures adequate digital signal goes to the CCM to provide the control. And separately (after buffering/amplifying) the serial signal also drives the IR LED in the tether. Hope this helps!
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