AN3;
selects KAT4 ATU antenna 3
FA7100;
sets VFO A to 7100 kHz (FA/FB support multiple numeric formats)
MD$3;
selects CW mode for VFO B/sub RX
GET commands
use only the prefix; the response to a GET (RESP) uses the SET format.
Examples:
AN;
returns ANx; where x is the currently selected antenna
MD$;
returns MD$x; where x is the current operating mode for VFO B/sub RX
TOGGLE/INCR/DECR commands
are special variants of SET commands. Examples:
RA/;
turns VFO A/main RX attenuator on if it was off and vice-versa
BN$+;
selects the next-highest band for VFO B/sub RX
K4 switch emulation commands (SW)
simulate the use of switches on the K4's front panel.
2-digit IDs specify the function without the need to differentiate between tap and hold. Examples:
SW56;
simulates tapping the K4's NR switch
K3 switch emulation commands (SWT/SWH)
support a subset of K3/K3S switches that have
matching K4 functions. These are provided for compatibility with existing applications. Example:
SWT16;
simulates tapping the K4's XMIT switch (identical to SWT16 on the K3/K3S).
Meta commands (K2, K3, K4)
affect behavior of certain individual commands and the overall
protocol. Refer to the command reference for details.
Display commands
are preceded by a
#
symbol to disambiguate them from current or future
radio control commands.
Error Checking
If a GET or SET command is received that cannot be parsed, the radio will echo the command
followed by "?" and a semicolon terminator. If a command is correctly formed but a parameter is
out of range, a GET response is echoed that shows the current valid setting.
Multiple Client Support
A K4 may be controlled by multiple clients simultaneously, including other K4s or software applications
running on computers or mobile devices. Connections can be established through the two virtual COM
ports (USB-B connector), the RS232 port (DE9 connector), or Ethernet.
