[amsat-bb] TH-F6 Remote Control?

Has anyone tried remote control of the TH-F6 HT?

We built the interface shown on http://www.misobras.com/esquemas/ham/MOD/kenwood/TH-F7-1.htm

But using hyperterm and typing symple commands we get nothing. We have pressed the menu-9 key and set it to PC. We type a simple command like "ANT" and expect it to come back with the setting in response.

Anyone done this? Bob