Elecraft KIO2 - Manual (Page 7)

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GT (AGC Time Constant; GET/SET)
Basic SET/RSP format: GTnnn; where n is 002 for fast AGC and 004 for slow AGC.
Extended SET/RSP format: GTnnnx; where n is defined as above, and x is 0 (AGC off) or 1 (AGC on).
ID (Transceiver Identifier; GET only)
RSP format: IDnnn; where nnn is 017. This command is provided only for compatibility with existing software,
which may use ID in order to distinguish between transceivers. New or modified software should send the K2
command to the transceiver; if a K2n; response is received, the computer must be connected to a K2.
IF (Transceiver Information; GET only)
RSP format: IF[f]*****+yyyyrx*00tmvspb01*; where the fields are defined as follows:
[f] operating frequency, excluding any RIT/XIT offset (11 digits; see FA command)
* represents a space (BLANK, or ASCII 0x20)
+ either "+" or "-" (sign of RIT/XIT offset)
yyyy RIT/XIT offset in Hz (range is -9990 to +9990 Hz when computer-controlled)
r 1 if RIT is on, 0 if off
x 1 if XIT is on, 0 if off
t 1 if the K2 is in transmit mode, 0 if receive
m operating mode (see MD command)
v receive-mode VFO selection, 0 for VFO A, 1 for VFO B
s 1 if scan is in progress, 0 otherwise
p1 if the transceiver is in sp lit mode, 0 otherwise
b basic RSP format: always 0
extended RSP format: 1 if the present IF response is due to a K2 band change and 0 otherwise
The fixed-value fields (space, 0, and 1) are provided for syntactic compatibility with existing software.
K2 (Command Mode; GET/SET)
SET/RSP format: K2n; where n is 0-3. See Meta-commands for details.
KS (Keyer Speed; GET/SET)
SET/RSP format: KSnnn; where nnn is 009-050 (9-50 WPM).
KY (CW Keying from Text; GET/SET)
SET format: KY*[text]; where * is a BLANK (ASCII hex 0x20) and [text] is 0 to 24 characters.
Basic RSP format: KYn; where n is 0 (CW text buffer not full) or 1 (buffer full).
Extended RSP format: KYn; where n is 0 (buffer < 75% full), 1 (buffer > 75% full), or 2 (buffer completely
empty AND transmit of previous string is complete.
The following keyboard characters are mapped to CW "prosigns":
( KN + AR = BT % AS * SK
In addition to the prosigns, three special characters can be inserted anywhere in the KY command text:
< puts the K2 into CW TEST mode, until a '>' character is received
> returns the K2 to CW OPERATE mode
@ immediately terminates any keyboard-CW transmit that was in progress