[Elecraft] Pinout for KAT500 1/8th inch serial "PC Data" plug/socket

[Lu Romero (mobile)]

All:

Anyone here know the serial port pinout of the 1/8 inch "stereo" plug and socket on the KAT500 rear panel? Im looking to remotecontrol the tuner using a serial device server. The device server has a DB9 socket, so I need to make a DB9 to 1/8 inch plug cable to control the tuner remotely.
I looked in the manual, however, I cant find a pin out of the plug there.
Would be nice to have the signal designations as well for the TRS plug so as to make up the cable correctly.
Luis Romero - W4LT