"Scope traces for a typical KAT500 serial data interface can be found here -
https://www.dropbox.com/scl/fi/ypk0ks16rl03d55ugm4t9/KAT500-signal-levels.pdf?rlkey=7iahis4xp0jnua3c8s577cxjq&dl=0";
The depicted voltage levels for KAT500 driving the KXUSB were not typical. In
my station the KAT500 serial port transmitter connects to both the KXUSB
receiver and a MAX3232. The MAX3232 terminates the input with 5k which is
almost identical to the KAT500 transmitter source impedance. The observed
voltage is higher when this 5k load is not present.
Thanks to Jack, W6FB, for spotting this error.
73,
Andy, k3wyc
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