[Elecraft] K2 USB to 9 Pin Cable (info)

[Andy Durbin]

"Before plugging that into the K2 AUX IO connector, the Green, Brown, and Red conductors must be cut or damage to the K2 and/or the adapter can be damaged."

It appears to me that the only AUX connector pins that are used by this proposed cable are 2, 3, and 5.    If the K2 will accept RS-232 levels without damage then I don't see how any damage can be done by the proposed cable.  The cable specification would be clearer if the meaning of "RTC" were known.  I suspect it's a typo for RTS and that the CTS and RTS wires are tied together but not connected to the AUX connector.

73,
Andy, k3wyc