ELECRAFT K4 - Page 110

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Serial USB-PC1: DTR
Specifies the function of the DTR pin for this port (OFF, PTT, KEY, FSK).
Serial USB-PC1: RTS
Specifies the function of the RTS pin for this port (OFF, PTT, KEY).
Serial USB-PC2: Auto Info
Sets the Auto-Info mode for this port. The default is NOR (no auto-info). In
the AUTO1 setting, the K4 will emit "IF" command responses on certain
control changes including VFOs, mode, and RIT. For further details on auto-
info ("AI" command) and the "IF" command, refer to the K4 Programmer's
Reference.
Serial USB-PC2: Baud Rate
Specifies the baud rate for this port (4800, 9600, 19200, 38400, 57600, or
115200 baud).
Serial USB-PC2: DTR
Specifies the function of the DTR pin for this port (OFF, PTT, KEY, FSK).
Serial USB-PC2: RTS
Specifies the function of the RTS pin for this port (OFF, PTT, KEY).
Speaker, Internal
Allows the internal speaker to be turned on or off. Even when set to ON, it
will be turned off when external speakers or headphones are plugged in.
The latter can be overridden (see Speakers + Phones, below). NOTE: When
the internal speaker is in use, left and right channel audio are mixed
(mono).