[Elecraft] K3 TX light flashing when RTS=PTT

[Frank Stein]

At Field Day this year, the K3 TX light started flashing when we loaded
N1MM to use RTS=PTT to send .wav files.  This only occurs when RTS=PTT is
set on the rig.   I thought it was a bug in N1MM but it also does this when
using N3FLP's logger and the flashing corresponds to the polling rate
(which N3FJP allows one to set).

This is not a bug in either program since I get the same response when I
use the K3 Utility and select Terminal Tab.

Why would polling the rig cause the TX light to flash and the receive audio
to momentarily drop?  This is not a temporary initiation of the USB-RS-232
connection.   And more importantly, what setting is wrong that is causing
this?

I have tried a different computer with a rs-232 port and I get the same
result.

Thanks,
Frank
W4TG
fstein at ieee.org