Yaesu FT-991 CAT Product guide

FT-991
CAT OperATiOn
reFerenCe BOOk
YAESU MUSEN CO., LTD.

FT-991 CAT Operation Manual1
CAT (CompuTer Aided TrAnsCeiver)operATion
Overview
The CAT (Computer Aided Transceiver) System in
the FT-991 transceiver provides control of frequency,
VFO, memory, and other settings such as dual-
channel memories and diversity reception using an
external personal computer. This allows multiple
control operations to be fully automated with single
mouse clicks, or keystroke operations on the computer
keyboard.
Using the RS-232C Cable (Refer to gure 1)
The FT-991 transceiver has a built-in level converter,
allowing direct connection from the rear-panel CAT jack
to the serial port of your computer without the need of
any external boxes.
When using the RS-232C cable, set Menu item “028
GPS/232C SELECT” to “RS232C”.
You will need a serial cable for connection to the RS-
232C (serial or COM port) connector on your computer.
Purchase a standard serial cable (not the so-called “null
modem” type), ensuring it has the correct gender and
number of pins (some serial COM port connectors use a
9-pin rather than 25-pin conguration). If your computer
uses a custom connector, you may have to construct the
cable. In this case, refer to the technical documentation
supplied with your computer for correct data connection.
Using the USB Cable (Refer to gure 2)
Note: A USB driver is required for remote control from
a computer. Download the driver from the Yaesu
website (http://www.yaesu.com).
The FT-991 transceiver has a built-in USB to Dual
UART Bridge, allowing direct connection from the
rear-panel USB jack to the USB jack of your computer
without the need of any external boxes.
You will need a USB cable to connect to the USB jack
on your computer.
YAESU MUSEN does not produce CAT System
operating software due to the wide variety of per-
sonal computers and operating systems in use today.
However, the information provided in this chapter
explains the serial data structure and opcodes used
by the CAT system. This information, along with
the short programming examples, is intended to
help you start writing programs on your own. As
you become more familiar with CAT operation, you
can customize programs for your operating needs
and utilize the full operating potential of this sys-
tem.
COnnectiOn
①②③④⑤
⑧⑨ ⑦ ⑥
Pin No. Pin Name I/O Function
N/A --- ---
SERIAL OUT Output Outputs the Serial Data from
the transceiver to the computer.
SERIAL IN Input Inputs the Serial Data from the
computer to the transceiver.
N/A --- ---
GND --- Signal Ground
N/A --- ---
RTS --- ---
CTS --- ---
N/A --- ---
GPS/CAT
COM
Personal Computer
RS-232C “Straight” Cable
FT-991
Figure 1
USB
USB
FT-991
Personal Computer
USB Cable
Figure 2

FT-991 CAT Operation Manual2
CAT (CompuTer Aided TrAnsCeiver)operATion
Control Command
A computer control command is composed of an alpha-
betical command, various parameters, and the terminator
that signals the end of the control command.
Example: Set the VFO-A frequency to 14.250000 MHz.
FA 014250000 ;
   
Command Parameter Terminator
There are three commands for the Ft-991 as shown be-
low:
Set command: Set a particular condition
(to the Ft-991)
Read command: Reads an answer
(from the Ft-991)
Answer command: Transmits a condition
(from the Ft-991)
For example, note the following case of the FA com-
mand (Set the VFO-A frequency):
To set the VFO-A frequency to 14.250000 MHz, the
following command is sent from the computer to the
transceiver:
“FA014250000;” (Set command)
To read the VFO-A frequency, the following com-
mand is sent from the computer to the transceiver:
“FA;” (Read command)
When the Read command above has been sent, the
following command is returned to the computer:
“FA014250000;” (Answer command)
Alphabetical Commands
A command consists of 2 alphabetical characters.
You may use either lower or upper case characters. The
commands available for this transceiver are listed in the
“PC Control Command Tables” on the following pages.
Parameters
Parameters are used to specify information necessary to
implement the desired command.
The parameters to be used for each command are pre-
determined. The number of digits assigned to each
parameter is also predetermined. Refer to the “Control
Command List” and the “Control Command Tables” to
congure the appropriate parameters.
When configuring parameters, be careful not to make
the following mistakes.
For example,
when the correct parameter is “IS0+1000” (IF SHIFT):
IS01000;
Not enough parameters specied (No direction (+)
given for the IF shift)
IS0+100;
Not enough digits (Only three frequency digits
given)
IS0_+_1000;
Unnecessary characters between parameters
IS0+10000;
Too many digits (Five frequency digits given)
Note: If a particular parameter is not applicable to the
Ft-991, the parameter digits should be lled using any
character except the ASCII control codes (00 to 1Fh)
and the terminator (;).
Terminator
To signal the end of a command, it is necessary to use
a semicolon (;). The digit where this special character
must appear differs depending on the command used.

FT-991 CAT Operation Manual3
CAT (CompuTer Aided TrAnsCeiver)operATion
Command Function Set Read Ans. AI
AB VFO-A TO VFO-B O X X X
AC ANTENNA TUNER
CONTROL OOOO
AG AF GAIN O O O O
AI AUTO INFORMATION O O O X
AM VFO-A TO MEMORY
CHANNEL O X X X
BA VFO-B TO VFO-A O X X X
BC AUTO NOTCH O O O O
BD BAND DOWN O X X X
BI BREAK-IN O O O O
BP MANUAL NOTCH O O O O
BS BAND SELECT O X X X
BU BAND UP O X X X
BY BUSY X O O O
CH CHANNEL UP/DOWN O X X X
CN CTCSS NUMBER O O O O
CO CONTOUR O O O O
CS CW SPOT O O O O
CT CTCSS O O O O
DA DIMMER O O O X
DN DOWN O X X X
DT DATE AND TIME O O O X
ED ENCORDER DOWN O X X X
EK ENT KEY O X X X
EU ENCORDER UP O X X X
EX MENU O O O O
FA FREQUENCY VFO-A O O O O
FB FREQUENCY VFO-B O O O O
FS FAST STEP O O O O
FT FUNCTION TX OOOO
GT AGC FUNCTION O O O O
ID IDENTIFICATION X O O X
IF INFORMATION X O O O
IS IF-SHIFT O O O O
KM KEYER MEMORY O O O X
KP KEY PITCH O O O O
KR KEYER O O O O
KS KEY SPEED O O O O
KY CW KEYING O X X X
LK LOCK O O O O
LM LOAD MESSEGE O O O X
MA
MEMORY CHANNEL TO
VFO-A
O X X X
MC MEMORY CHANNEL O O O X
MD MODE O O O O
MG MIC GAIN O O O O
ML MONITOR LEVEL O O O O
MR MEMORY READ X O O X
MS METER SW O O O O
MW MEMORY WRITE O X X X
MX MOX SET O O O O
NA NARROW O O O O
NB NOISE BLANKER O O O O
NL NOISE BLANKER
LEVEL OOOO
NR NOISE REDUCTION O O O O
OI
OPPOSITE BAND
NFORMATION
X O O O
OS OFFSET (Repeater
Shift) OOOO
PA PRE-AMP (IPO) O O O O
PB PLAY BACK O O O X
PC POWER CONTROL O O O O
PL
SPEECH PROCESSOR
LEVEL
OOOO
Command Function Set Read Ans. AI
PR SPEECH PROCESSOR O O O O
PS POWER SWITCH O O O X
QI QMB STORE O X X X
QR QMB RECALL O X X X
QS QUICK SPLIT O X X X
RA RF ATTENUATOR OOOO
RC CLAR CLEAR O X X X
RD CLAR DOWN O X X X
RG RF GAIN O O O O
RI RADIO INFORMATION X O O O
RL NOISE REDUCTION
LEVEL OOOO
RM READ METER X O O O
RS RADIO STATUS X O O X
RT CLAR O O O O
RU CLAR UP O X X X
SC SCAN O O O O
SD SEMI BREAK-IN DELAY
TIME OOOO
SH WIDTH O O O O
SM S METER X O O X
SQ SQUELCH LEVEL O O O O
SV SWAP VFO O X X X
TS TXW O O O O
TX TX SET O O O O
UL UNLOCK X O O O
UP UP O X X X
VD VOX DELAY TIME OOOO
VG VOX GAIN O O O O
VM [V/M] KEY FUNCTION O X X X
VX VOX O O O O
XT TX CLAR O O O O
ZI ZERO IN O X X X

FT-991 CAT Operation Manual4
CAT (CompuTer Aided TrAnsCeiver)operATion
AB VFO-A TO VFO-B
Set 12345678910
A B ;
Read 12345678910
Answer 12345678910
AC ANTENNA TUNER CONTROL
Set 12345678910P1 0: Fixed P3 0: Tuner “OFF”
P2 0: Fixed 1: Tuner “ON”
2: Tuning Start
A C P1 P2 P3 ;
Read 12345678910
A C ;
Answer 12345678910
A C P1 P2 P3 ;
AG AF GAIN
Set 12345678910P1 0: Fixed
P2 000 - 255
A G P1 P2 P2 P2 ;
Read 12345678910
A G P1 ;
Answer 12345678910
A G P1 P2 P2 P2 ;
AI AUTO INFORMATION
Set 12345678910P1 0: Auto Information “OFF”
1: Auto Information “ON”
This parameter is set to “0” (OFF) automatically when the transceiver is turned “OFF”.
A I P1 ;
Read 12345678910
A I ;
Answer 12345678910
A I P1 ;
AM VFO-A TO MEMORY CHANNEL
Set 12345678910
A M ;
Read 12345678910
Answer 12345678910
BA VFO-B TO VFO-A
Set 12345678910
B A ;
Read 12345678910
Answer 12345678910
BC AUTO NOTCH
Set 12345678910P1 0: Fixed
P2 0: Auto Notch “OFF”
1: Auto Notch “ON”
B C P1 P2 ;
Read 12345678910
B C P1 ;
Answer 12345678910
B C P1 P2 ;
BD BAND DOWN
Set 12345678910P1 0: Fixed
B D P1 ;
Read 12345678910
Answer 12345678910

FT-991 CAT Operation Manual5
CAT (CompuTer Aided TrAnsCeiver)operATion
BI BREAK-IN
Set 12345678910P1 0: Break-in “OFF”
1: Break-in “ON”
B I P1 ;
Read 12345678910
B I ;
Answer 12345678910
B I P1 ;
BP MANUAL NOTCH
Set 12345678910P1 0: Fixed P3 P2=0
P2 0: Manual NOTCH “ON/OFF” 000: “OFF”
1: Manual NOTCH LEVEL 001: “ON”
P2=1
001 - 320
(NOTCH Frequency : x 10 Hz )
B P P1 P2 P3 P3 P3 ;
Read 12345678910
B P P1 P2 ;
Answer 12345678910
B P P1 P2 P3 P3 P3 ;
BS BAND SELECT
Set 12345678910P1 00: 1.8 MHz 06: 18 MHz 12: MW
01: 3.5 MHz 07: 21 MHz 13: -
02: - 08: 24.5 MHz 14: AIR
03: 7 MHz 09: 28 MHz 15: 144 MHz
04: 10 MHz 10: 50 MHz 16: 430 MHz
05: 14 MHz 11: GEN
B S P1 P1 ;
Read 12345678910
Answer 12345678910
BU BAND UP
Set 12345678910P1 0: Fixed
B U P1 ;
Read 12345678910
Answer 12345678910
BY BUSY
Set 12345678910P1 0: RX BUSY “OFF”
1: RX BUSY “ON”
P2 0: Fixed
Read 12345678910
B Y ;
Answer 12345678910
B Y P1 P2 ;
CH CHANNEL UP/DOWN
Set 12345678910P1 0: Memory Channel “UP”
1: Memory Channel “DOWN”
C H P1 ;
Read 12345678910
Answer 12345678910
CN CTCSS TONE FREQUENCY
Set 12345678910P1 0: Fixed
P2 0 - 49: Tone Frequency Number (See Table 1)
C N P1 P2 P2 ;
Read 12345678910
C N P1 ;
Answer 12345678910
C N P1 P2 P2 ;
CO CONTOUR
Set 12345678910P1 0: Fixed P3 P2=0 0000: CONTOUR “OFF”
P2 0: CONTOUR “ON/OFF” 0001: CONTOUR “ON”
1: CONTOUR FREQ P2=1 0010 - 3200
2: APF “ON/OFF” (CONTOUR Frequency:10 - 3200Hz)
3: APF FREQ P2=2 0000: APF “OFF”
0001: APF “ON”
P2=3 0000 - 0050 (
APF Frequency : -250 - 250 Hz )
C O P1 P2 P3 P3 P3 P3 ;
Read 12345678910
C O P1 P2 ;
Answer 12345678910
C O P1 P2 P3 P3 P3 P3 ;

FT-991 CAT Operation Manual6
CAT (CompuTer Aided TrAnsCeiver)operATion
CS CW SPOT
Set 12345678910P1 0: OFF
1: ON
C S P1 ;
Read 12345678910
C S ;
Answer 12345678910
C S P1 ;
CT CTCSS
Set 12345678910P1 0: Fixed
P2 0: CTCSS “OFF”
1: CTCSS ENC/DEC “ON”
2: CTCSS ENC “ON”
3: DCS “ON”
C T P1 P2 ;
Read 12345678910
C T P1 ;
Answer 12345678910
C T P1 P2 ;
Table 1 (CTCSS Tone Chart)
00 67.0 Hz 09 91.5 Hz 18 123.0 Hz 27 162.2 Hz 36 189.9 Hz 45 229.1 Hz
01 69.3 Hz 10 94.8 Hz 19 127.3 Hz 28 165.5 Hz 37 192.8 Hz 46 233.6 Hz
02 71.9 Hz 11 97.4 Hz 20 131.8 Hz 29 167.9 Hz 38 196.6 Hz 47 241.8 Hz
03 74.4 Hz 12 100.0 Hz 21 136.5 Hz 30 171.3 Hz 39 199.5 Hz 48 250.3 Hz
04 77.0 Hz 13 103.5 Hz 22 141.3 Hz 31 173.8 Hz 40 203.5 Hz 49 254.1 Hz
05 79.7 Hz 14 107.2 Hz 23 146.2 Hz 32 177.3 Hz 41 206.5 Hz - -
06 82.5 Hz 15 110.9 Hz 24 151.4 Hz 33 179.9 Hz 42 210.7 Hz - -
07 85.4 Hz 16 114.8 Hz 25 156.7 Hz 34 183.5 Hz 43 218.1 Hz - -
08 88.5 Hz 17 118.8 Hz 26 159.8 Hz 35 186.2 Hz 44 225.7 Hz - -
DA DIMMER
Set 12345678910P1 00: Fixed
P2 01 - 02: LED Indicators Brightness Level
P3 00 - 15: TFT Display Brightness Level
D A P1 P1 P2 P2 P3 P3 ;
Read 12345678910
D A ;
Answer 12345678910
D A P1 P1 P2 P2 P3 P3 ;
DN MIC DWN
Set 12345678910
D N ;
Read 12345678910
Answer 12345678910
DT DATE AND TIME
Set 1234567~n-1 n P1 0: Date
1: Time (UTC)
2: Time differential (Time Zone)
P2 P1=0 yyyymmdd (Year/Month/Date)
P1=1 hhmmss (Hour/Minute/Second, 24 hour time system)
P1=2 hhmm (Hour/Minute, 30 minute increments)
D T P1 P2 P2 P2 P2 ~P2 ;
Read 12345678910
D T P1 ;
Answer 1234567~n-1 n
D T P1 P2 P2 P2 P2 ~P2 ;
ED ENCORDER DOWN
Set 12345678910P1 0: MAIN ENCORDER
1: SUB ENCORDER
8: MULTI ENCORDER
P2 01 - 99: Steps
E D P1 P2 P2 ;
Read 12345678910
Answer 12345678910
EK ENT KEY
Set 12345678910
E K ;
Read 12345678910
Answer 12345678910

FT-991 CAT Operation Manual7
CAT (CompuTer Aided TrAnsCeiver)operATion
EU ENCORDER UP
Set 12345678910P1 0: MAIN ENCORDER
1: SUB ENCORDER
8: MULTI ENCORDER
P2 01 - 99: Steps
E U P1 P2 P2 ;
Read 12345678910
Answer 12345678910
EX MENU
Set 1234567~n-1 n P1 : 001 - 151 (MENU Number)
P2 : Parameter (See Table)
E X P1 P1 P1 P2 P2 ~P2 ;
Read 12345678910
E X P1 P1 P1 ;
Answer 1234567~n-1 n
E X P1 P1 P1 P2 P2 ~P2 ;
P1 Function P2 Digits
001 AGC FAST DELAY 20 ~ 4000 msec (P2= 0020 ~ 4000, 20 msec/step) 4
002 AGC MID DELAY 20 ~ 4000 msec (P2= 0020 ~ 4000, 20 msec/step) 4
003 AGC SLOW DELAY 20 ~ 4000 msec (P2= 0020 ~ 4000, 20 msec/step) 4
004 HOME FUNCTION 0: SCOPE 1: FUNCTION 1
005 MY CALL INDICATION 0 ~ 5 sec 1
006 DISPLAY COLOR 0: BLUE 1: GRAY 2: GREEN 3: ORANGE 4: PURPLE 5: RED 6: SKY BLUE 1
007 DIMMER LED 0: 1 1: 2 1
008 DIMMER TFT 00 ~ 15 2
009 BAR MTR PEAK HOLD 0: OFF 1: 0.5 sec 2: 1.0 sec 3: 2.0 sec 1
010 DVS RX OUT LEVEL 0 ~ 100 (P2 = 000 ~ 100) 3
011 DVS TX OUT LEVEL 0 ~ 100 (P2 = 000 ~ 100) 3
012 KEYER TYPE 0: OFF 1: BUG 2: ELEKEY-A 3: ELEKEY-B 4: ELEKEY-Y 5: ACS 1
013 KEYER DOT/DASH 0: NORNAL 1: REVERSE 1
014 CW WEIGHT 2.5 ~ 4.5 (P2 = 25 ~ 45) 2
015 BEACON INTERVAL OFF / 1 ~ 690 sec (P2 = 000 ~ 690, 000: OFF) 3
016 NUMBER STYLE 0: 1290 1: AUNO 2: AUNT 3: A2NO 4: A2NT 5: 12NO 6: 12NT 1
017 CONTEST NUMBER 0000 ~ 9999 4
018 CW MEMORY 1 0: TEXT 1: MESSAGE 1
019 CW MEMORY 2 0: TEXT 1: MESSAGE 1
020 CW MEMORY 3 0: TEXT 1: MESSAGE 1
021 CW MEMORY 4 0: TEXT 1: MESSAGE 1
022 CW MEMORY 5 0: TEXT 1: MESSAGE 1
023 NB WIDTH 0: 1 ms 1: 3 ms 2: 10 ms 1
024 NB REJECTION 0: 10 dB 1: 30 dB 2: 50 dB 1
025 NB LEVEL 0 ~ 10 (P2 = 00 ~ 10) 2
026 BEEP LEVEL 0 ~ 100 (P2 = 000 ~ 100) 3
027 TIME ZONE UTC –12:00 ~ +14:00 5
028 GPS/232C SELECT 0: GPS 1: RS232C 1
029 232C RATE 0: 4800 bps 1: 9600 bps 2: 19200 bps 3: 38400 bps 1
030 232C TOT 0: 10 msec 1: 100 msec 2: 1000 msec 3: 3000 msec 1
031 CAT RATE 0: 4800 bps 1: 9600 bps 2: 19200 bps 3: 38400 bps 1
032 CAT TOT 0: 10 msec 1: 100 msec 2: 1000 msec 3: 3000 msec 1
033 CAT RTS 0: DISABLE 1: ENABLE 1
034 MEM GROUP 0: DISABLE 1: ENABLE 1
035 QUICK SPLIT FREQ –20 kHz ~ +00 (or –00) ~ +20 kHz (P2= –20 ~ +00 or –00 ~ +20) 3
036 TX TOT 0 (OFF) ~ 30 min (P2= 00 ~ 30) 2
037 MIC SCAN 0: DISABLE 1: ENABLE 1
038 MIC SCAN RESUME 0: PAUSE 1: TIME 1
039 REF FREQ ADJ –25 ~ +00 (or –00) ~ +25 (P2= –25 ~ +00 or –00 ~ +25) 3
040 CLAR MODE SELECT 0: RX 1: TX 2: TRX 1
041 AM LCUT FREQ 00: OFF 01: 100 Hz ~ 19: 1000 Hz (50 Hz steps) 2
042 AM LCUT SLOPE 0: 6 dB/oct 1: 18 dB/oct 1
043 AM HCUT FREQ 00: OFF 01: 700 Hz ~ 67: 4000 Hz (50 Hz steps) 2
044 AM HCUT SLOPE 0: 6 dB/oct 1: 18 dB/oct 1
045 AM MIC SELECT 0: MIC 1: REAR 1
046 AM OUT LEVEL 0 ~ 100 (P2 = 000 ~ 100) 3
047 AM PTT SELECT 0: DAKY 1: RTS 2: DTR 1
048 AM PORT SELECT 0: DATA 1: USB 1
049 AM DATA GAIN 0 ~ 100 (P2 = 000 ~ 100) 3
050 CW LCUT FREQ 00: OFF 01: 100 Hz ~ 19: 1000 Hz (50 Hz steps) 2
051 CW LCUT SLOPE 0: 6 dB/oct 1: 18 dB/oct 1
052 CW HCUT FREQ 00: OFF 01: 700 Hz ~ 67: 4000 Hz (50 Hz steps) 2
053 CW HCUT SLOPE 0: 6 dB/oct 1: 18 dB/oct 1
054 CW OUT LEVEL 0 ~ 100 (P2 = 000 ~ 100) 3
055 CW AUTO MODE 0: OFF 1: 50 MHz 2: ON 1
056 CW BK-IN TYPE 0: SEMI BREAK-IN 1: FULL BREAK-IN 1
057 CW BK-IN DELAY 30 ~ 3000 msec (P2 = 0030 ~ 3000, 10 msec/step) 4
058 CW WAVE SHAPE 0: 1 msec 1: 2 msec 2: 4 msec 3: 6 msec 1
059 CW FREQ DISPLAY 0: DIRECT FREQ 1: PITCH OFFSET 1
060 PC KEYING 0: OFF 1: DAKY 2: RTS 3: DTR 1
061 QSK DELAY TIME 0: 15 msec 1: 20 msec 2: 25 mesc 3: 30 msec 1

FT-991 CAT Operation Manual8
CAT (CompuTer Aided TrAnsCeiver)operATion
P1 Function P2 Digits
062 DATA MODE 0: PSK 1: OTHER 1
063 PSK TONE 0: 1000 Hz 1: 1500 Hz 2: 2000 Hz 1
064 OTHER DISP (SSB) –3000 Hz ~ 0 ~ +3000 Hz (P2 = –3000 ~ –0000 or +0000 ~ +3000, 10 Hz steps) 5
065 OTHER SHIFT (SSB) –3000 Hz ~ 0 ~ +3000 Hz (P2 = –3000 ~ –0000 or +0000 ~ +3000, 10 Hz steps) 5
066 DATA LCUT FREQ 00: OFF 01: 100 Hz ~ 19: 1000 Hz (50 Hz steps) 2
067 DATA LCUT SLOPE 0: 6 dB/oct 1: 18 dB/oct 1
068 DATA HCUT FREQ 00: OFF 01: 700 Hz ~ 67: 4000 Hz (50 Hz steps) 1
069 DATA HCUT SLOPE 0: 6 dB/oct 1: 18 dB/oct 2
070 DATA IN SELECT 0: MIC 1: REAR 1
071 DATA PTT SELECT 0: DAKY 1: RTS 2: DTR 1
072 DATA PORT SELECT 1: DATA 2: USB 1
073 DATA OUT LEVEL 0 ~ 100 (P2 = 000 ~ 100) 3
074 FM MIC SELECT 0: MIC 1: REAR 1
075 FM OUT LEVEL 0 ~ 100 (P2 = 000 ~ 100) 3
076 FM PKT PTT SELECT 0: DAKY 1: RTS 2: DTR 1
077 FM PKT PORT SELECT 1: DATA 2: USB 1
078 FM PKT TX GAIN 0 ~ 100 (P2 = 000 ~ 100) 3
079 FM PKT MODE 0: 1200 1: 9600 1
080 RPT SHIFT 28MHz 0 ~ 1000 kHz (P2 = 0000 ~ 1000, 10 kHz/step) 4
081 RPT SHIFT 50MHz 0 ~ 4000 kHz (P2 = 0000 ~ 4000, 10 kHz/step) 4
082 RPT SHIFT 144MHz 0 ~ 4000 kHz (P2 = 0000 ~ 4000, 10 kHz/step) 4
083 RPT SHIFT 430MHz 0 ~ 10000 kHz (P2 = 0000 ~ 10000, 10 kHz/step) 5
084 ARS 144MHz 0: OFF 1: ON 1
085 ARS 430MHz 0: OFF 1: ON 1
086 DCS POLARITY 0: Tn-Rn 1: Tn-Riv 2: Tiv-Rn 3: Tiv-Riv 1
087 RADIO ID - - - - - - - - - - -
088 DIGITAL SQL TYPE 0: OFF 1: CODE 2: BREAK 1
089 DIGITAL SQL CODE 001 ~ 126 3
090 GM DISPLY 0: DISTANCE 1: STRENGTH 1
091 DISTANCE 0: km 1: mile 1
092 AMS TX MODE 0: AUTO 1: MANUAL 2: DN 3: VW 4: ANALOG 1
093 STANDBY BEEP 0: OFF 1: ON 1
094 RTTY LCUT FREQ 00: OFF 01: 100 Hz ~ 19: 1000Hz (50 Hz steps) 2
095 RTTY LCUT SLOPE 0: 6 dB/oct 1: 18 dB/oct 1
096 RTTY HCUT FREQ 00: OFF 01: 700 Hz ~ 67: 4000Hz (50 Hz steps) 2
097 RTTY HCUT SLOPE 0: 6 dB/oct 1: 18 dB/oct 1
098 RTTY SHIFT PORT 0: SHIFT 1: DTR 2: RTS 1
099 RTTY POLARITY-RX 0: NORNAL 1: REVERSE 1
100 RTTY POLARITY-TX 0: NORNAL 1: REVERSE 1
101 RTTY OUT LEVEL 0 ~ 100 (P2 = 000 ~ 100) 3
102 RTTY SHIFT FREQ 1: 170 Hz 1: 200 Hz 2: 425 Hz 3: 850 Hz 1
103 RTTY MARK FREQ 1: 1275 Hz 2: 2125 Hz 1
104 SSB LCUT FREQ 00: OFF 01: 100 Hz ~ 19: 1000 Hz (50 Hz steps) 2
105 SSB LCUT SLOPE 0: 6 dB/oct 1: 18 dB/oct 1
106 SSB HCUT FREQ 00: OFF 01: 700 Hz ~ 67: 4000 Hz (50 Hz steps) 2
107 SSB HCUT SLOPE 0: 6 dB/oct 1: 18 dB/oct 1
108 SSB MIC SELECT 0: MIC 1: REAR 1
109 SSB OUT LEVEL 0 ~ 100 (P2 = 000 ~ 100) 3
110 SSB PTT SELECT 0: DAKY 1: RTS 2: DTR 1
111 SSB PORT SELECT 0: DATA 1: USB 1
112 SSB TX BPF 0: 50 ~ 3000 1: 100 ~ 2900 2: 200 ~ 2800 3: 300 ~ 2700 4: 400 ~ 2600 1
113 APF WIDTH 0: NARROW 1: MEDIUM 2: WIDE 1
114 CONTOUR LEVEL –40 ~ 0 ~ +20 (P2 = –40 ~ –00 or +00 ~ +20) 3
115 CONTOUR WIDTH 01 ~ 11 2
116 IF NOTCH WIDTH 0: NARROW 1: WIDE 1
117 SCP DISPLAY MODE 0: SPECTRAM 1: WATER FALL 1
118 SCP START CYCLE 0: OFF 1: 3 sec 2: 5 sec 3: 10 sec 1
119 ASC DIAL SPEED 0: 0.25 kHz/sec 1: 0.5 kHz/sec 2: 1 kHz/sec 3: 2 kHz/sec 4: 4 kHz/sec 5: DISABLE 1
120 SCP SPAN FREQ 03: 50 kHz 04: 100 kHz 05: 200 kHz 06: 500 kHz 07: 1000 kHz 2
121 PRMTRC EQ1 FREQ 00 : OFF 01: 100 02: 200 03: 300 04: 400 05: 500 06: 600 07: 700 Hz 2
122 PRMTRC EQ1 LEVEL –20 ~ 0 ~ +10 (P2 = –20 ~ –00 or +00 ~ +10) 3
123 PRMTRC EQ1 BWTH 01 ~ 10 2
124 PRMTRC EQ2 FREQ 00: OFF 01: 700 02: 800 03: 900 04: 1000 05: 1100 06: 1200 07: 1300 08: 1400 09: 1500 Hz 2
125 PRMTRC EQ2 LEVEL –20 ~ 0 ~ +10 (P2 = –20 ~ –00 or +00 ~ +10) 3
126 PRMTRC EQ2 BWTH 01 ~ 10 2
127 PRMTRC EQ3 FREQ 00 : OFF 01: 1500 02: 1600 03: 1700 04: 1800 05: 1900 06: 2000 ~ 18: 3200 Hz 2
128 PRMTRC EQ3 LEVEL –20 ~ 0 ~ +10 (P2 = –20 ~ –00 or +00 ~ +10) 3
129 PRMTRC EQ3 BWTH 01 ~ 10 2
130 P-PRMTRC EQ1 FREQ 00 : OFF 01: 100 02: 200 03: 300 04: 400 05: 500 06: 600 07: 700 Hz 2
131 P-PRMTRC EQ1 LEVEL –20 ~ 0 ~ +10 (P2 = –20 ~ –00 or +00 ~ +10) 3
132 P-PRMTRC EQ1 BWTH 01 ~ 10 2
133 P-PRMTRC EQ2 FREQ 00: OFF 01: 700 02: 800 03: 900 04: 1000 05: 1100 06: 1200 07: 1300 08: 1400 09: 1500 Hz 2
134 P-PRMTRC EQ2 LEVEL –20 ~ 0 ~ +10 (P2 = –20 ~ –00 or +00 ~ +10) 3
135 P-PRMTRC EQ2 BWTH 01 ~ 10 2
136 P-PRMTRC EQ3 FREQ 00 : OFF 01: 1500 02: 1600 03: 1700 04: 1800 05: 1900 06: 2000 ~ 18: 3200 Hz 2
137 P-PRMTRC EQ3 LEVEL –20 ~ 0 ~ +10 (P2 = –20 ~ –00 or +00 ~ +10) 3
138 P-PRMTRC EQ3 BWTH 01 ~ 10 2
139 HF TX MAX POWER 5 ~ 100 (P2 = 005 ~ 100) 3
140 50M TX MAX POWER 5 ~ 100 (P2 = 005 ~ 100) 3
141 144M TX MAX POWER 5 ~ 50 (P2 = 005 ~ 050) 3
142 430M TX MAX POWER 5 ~ 50 (P2 = 005 ~ 050) 3
143 TUNER SELECT 0: OFF 1: INTERNAL 2: EXTERNAL 3: ATAS 4: LAMP 1

FT-991 CAT Operation Manual9
CAT (CompuTer Aided TrAnsCeiver)operATion
P1 Function P2 Digits
144 VOX SELECT 0: MIC 1: DATA 1
145 VOX GAIN 000 ~ 100 3
146 VOX DELAY 30 ~ 3000 msec (P2 = 0030 ~ 3000, 10 msec/step) 4
147 ANTI VOX GAIN 000 ~ 100 3
148 DATA VOX GAIN 000 ~ 100 3
149 DATA VOX DELAY 30 ~ 3000 msec (P2 = 0030 ~ 3000) 4
150 ANTI DVOX GAIN 000 ~ 100 3
151 EMERGENCY FREQ TX 0: DISABLE 1: ENABLE 1
FA FREQUENCY VFO-A
Set
12345678910P1 000030000 - 470000000 (Hz)
F A P1 P1 P1 P1 P1 P1 P1 P1
11 12 13 14 15 16 17 18 19 20
P1 ;
Read 12345678910
F A ;
Answer
12345678910
F A P1 P1 P1 P1 P1 P1 P1 P1
11 12 13 14 15 16 17 18 19 20
P1 ;
FB FREQUENCY VFO-B
Set
12345678910P1 000030000 - 470000000 (Hz)
F B P1 P1 P1 P1 P1 P1 P1 P1
11 12 13 14 15 16 17 18 19 20
P1 ;
Read 12345678910
F B ;
Answer
12345678910
F B P1 P1 P1 P1 P1 P1 P1 P1
11 12 13 14 15 16 17 18 19 20
P1 ;
FS FAST STEP
Set 12345678910P1 0: VFO-A FAST Key “OFF”
1: VFO-A FAST Key “ON”
F S P1 ;
Read 12345678910
F S ;
Answer 12345678910
F S P1 ;
FT FUNCTION TX
Set 12345678910P1 2: VFO-A Band Transmitter: TX
3: VFO-B Band Transmitter: TX
P2 0: VFO-A Band Transmitter: TX
1: VFO-B Band Transmitter: TX
F T P1 ;
Read 12345678910
F T ;
Answer 12345678910
F T P2 ;
GT AGC FUNCTION
Set 12345678910P1 0: Fixed P3 0: AGC “OFF”
P2 0: AGC “OFF” 1: AGC “FAST”
1: AGC “FAST” 2: AGC “MID”
2: AGC “MID” 3: AGC “SLOW”
3: AGC “SLOW” 4: AGC “AUTO-FAST”
4: AGC “AUTO” 5: AGC “AUTO-MID”
6: AGC “AUTO-SLOW”
G T P1 P2 ;
Read 12345678910
G T P1 ;
Answer 12345678910
G T P1 P3 ;
ID IDENTIFICATION
Set 12345678910P1 0570: FT-991
Read 12345678910
I D ;
Answer 12345678910
I D P1 P1 P1 P1 ;

FT-991 CAT Operation Manual10
CAT (CompuTer Aided TrAnsCeiver)operATion
IF INFORMATION
Set 12345678910P1 000-117 (Memory Channel) P2 VFO-A Frequency (Hz)
P3 ClarierDirection+:PlusShift,--:MinusShift
 ClarierOffset:0000-9999(Hz)
P4 0: RX CLAR “OFF” 1: RX CLAR “ON”
P5 0: TX CLAR “OFF” 1: TX CLAR “ON”
P6 MODE 1: LSB 2: USB 3: CW 4: FM 5: AM 6: RTTY-LSB 7: CW-R
8: DATA-LSB 9: RTTY-USB A: DATA-FM B: FM-N C: DATA-USB
D: AM-N E: C4FM
P7 0: VFO 1: Memory 2: Memory Tune 3: Quick Memory Bank (QMB)
4: QMB-MT 5: PMS 6: HOME
P8 0: CTCSS “OFF” 1: CTCSS ENC/DEC 2: CTCSS ENC
P9 00: (Fixed)
P10 0: Simplex 1: Plus Shift 2: Minus Shift
Read 12345678910
I F ;
Answer
12345678910
I F P1 P1 P1 P2 P2 P2 P2 P2
11 12 13 14 15 16 17 18 19 20
P2 P2 P2 P2 P3 P3 P3 P3 P3 P4
21 22 23 24 25 26 27 28 29 30
P5 P6 P7 P8 P9 P9 P10 ;
IS IF-SHIFT
Set 12345678910P1 0:Fixed
P2 -1000 ~ +1000 Hz (20 Hz steps)
I S P1 -/+ P2 P2 P2 P2 ;
Read 12345678910
I S P1 ;
Answer 12345678910
I S P1 -/+ P2 P2 P2 P2 ;
KM KEYER MEMORY
Set 1234567~53 n P1 1 - 5 : Keyer Memory Channel Number
P2 Message Characters (up to 50 characters)
K M P1 P2 P2 P2 P2 ~P2 ;
Read 12345678910
K M P1 ;
Answer 1234567~n-1 n
K M P1 P2 P2 P2 P2 ~P2 ;
KP KEY PITCH
Set 12345678910P1 00: 300 Hz - 75: 1050 Hz (10Hz steps)
K P P1 P1 ;
Read 12345678910
K P ;
Answer 12345678910
K P P1 P1 ;
KR KEYER
Set 12345678910P1 0: KEYER “OFF”
1: KEYER “ON”
K R P1 ;
Read 12345678910
K R ;
Answer 12345678910
K R P1 ;
KS KEY SPEED
Set 12345678910P1 004 - 060 (WPM)
K S P1 P1 P1 ;
Read 12345678910
K S ;
Answer 12345678910
K S P1 P1 P1 ;
KY CW KEYING
Set 12345678910P1 1: Keyer Memory “1” Playback 6: Message Keyer “1” Playback
2: Keyer Memory “2” Playback 7: Message Keyer “2” Playback
3: Keyer Memory “3” Playback 8: Message Keyer “3” Playback
4: Keyer Memory “4” Playback 9: Message Keyer “4” Playback
5: Keyer Memory “5” Playback A: Message Keyer “5” Playback
K Y P1 ;
Read 12345678910
Answer 12345678910

FT-991 CAT Operation Manual11
CAT (CompuTer Aided TrAnsCeiver)operATion
LK LOCK
Set 12345678910P1 0: VFO-A DIAL Lock “OFF”
1: VFO-A DIAL Lock “ON”
L K P1 ;
Read 12345678910
L K ;
Answer 12345678910
L K P1 ;
LM LOAD MESSEGE
Set 12345678910P1 0: DVS P2 0: DVS (Recording Stop)
1: DVS (CH “1” Recording Start/Stop)
2: DVS (CH “2” Recording Start/Stop)
3: DVS (CH “3” Recording Start/Stop)
4: DVS (CH “4” Recording Start/Stop)
5: DVS (CH “5” Recording Start/Stop)
L M P1 P2 ;
Read 12345678910
L M P1 ;
Answer 12345678910
L M P1 P2 ;
MA MEMORY CHANNEL TO VFO-A
Set 12345678910
M A ;
Read 12345678910
Answer 12345678910
MC MEMORY CHANNEL
Set 12345678910P1 000 - 117: Memory Channel Number
000 - 099: Regular Memory Channel
100: P-1L 101: P-1U ~ 116: P-9L 117: P-9U
M C P1 P1 P1 ;
Read 12345678910
M C ;
Answer 12345678910
M C P1 P1 P1 ;
MD OPERATING MODE
Set 12345678910P1 0: MAIN RX
P2 MODE 1: LSB 2: USB 3: CW-U 4: FM 5: AM 6: RTTY-LSB
7: CW-L 8: DATA-LSB 9: RTTY-USB A: DATA-FM
B: FM-N C: DATA-USB D: AM-N E: C4FM
M D P1 P2 ;
Read 12345678910
M D P1 ;
Answer 12345678910
M D P1 P2 ;
MG MIC GAIN
Set 12345678910P1 000 - 100
M G P1 P1 P1 ;
Read 12345678910
M G ;
Answer 12345678910
M G P1 P1 P1 ;
ML MONITOR LEVEL
Set 12345678910P1 0: MONI “ON/OFF”
1: MONI Level
P2 P1=0
000: MONI “OFF”
001: MONI “ON”
P1=1
000 - 100
M L P1 P2 P2 P2 ;
Read 12345678910
M L P1 ;
Answer 12345678910
M L P1 P2 P2 P2 ;

FT-991 CAT Operation Manual12
CAT (CompuTer Aided TrAnsCeiver)operATion
MR MEMORY CHANNEL READ
Set 12345678910P0/1 000-117 (Memory Channel) P2 VFO-A Frequency (Hz)
P3 ClarierDirection+:PlusShift,--:MinusShift
 ClarierOffset:0000-9999(Hz)
P4 0: RX CLAR “OFF” 1: RX CLAR “ON”
P5 0: TX CLAR “OFF” 1: TX CLAR “ON”
P6 MODE 1: LSB 2: USB 3: CW 4: FM 5: AM 6: RTTY-LSB 7: CW-R
8: DATA-LSB 9: RTTY-USB A: DATA-FM B: FM-N C: DATA-USB
D: AM-N E: C4FM
P7 0: VFO 1: Memory
P8 0: CTCSS “OFF” 1: CTCSS ENC/DEC 2: CTCSS ENC
P9 00: (Fixed)
P10 0: Simplex 1: Plus Shift 2: Minus Shift
Read 12345678910
M R P0 P0 P0 ;
Answer
12345678910
M R P1 P1 P1 P2 P2 P2 P2 P2
11 12 13 14 15 16 17 18 19 20
P2 P2 P2 P2 P3 P3 P3 P3 P3 P4
21 22 23 24 25 26 27 28 29 30
P5 P6 P7 P8 P9 P9 P10 ;
MS METER SW
Set 12345678910P1 0: COMP
1: ALC
2: PO
3: SWR
4: ID
5: VDD
M S P1 ;
Read 12345678910
M S ;
Answer 12345678910
M S P1 ;
MW MEMORY CHANNEL WRITE
Set
12345678910P1 000-117 (Memory Channel) P2 Frequency (Hz)
P3 ClarierDirection+:PlusShift,--:MinusShift
 ClarierOffset:0000-9999(Hz)
P4 0: RX CLAR “OFF” 1: RX CLAR “ON”
P5 0: TX CLAR “OFF” 1: TX CLAR “ON”
P6 MODE 1: LSB 2: USB 3: CW 4: FM 5: AM 6: RTTY-LSB 7: CW-R
8: DATA-LSB 9: RTTY-USB A: DATA-FM B: FM-N C: DATA-USB
D: AM-N E: C4FM
P7 00: (Fixed)
P8 0: CTCSS “OFF” 1: CTCSS ENC/DEC 2: CTCSS ENC
P9 00: (Fixed)
P10 0: Simplex 1: Plus Shift 2: Minus Shift
M W P1 P1 P1 P2 P2 P2 P2 P2
11 12 13 14 15 16 17 18 19 20
P2 P2 P2 P2 P3 P3 P3 P3 P3 P4
21 22 23 24 25 26 27 28 29 30
P5 P6 P7 P8 P9 P9 P10 ;
Read 12345678910
Answer 12345678910
MX MOX SET
Set 12345678910P1 0: MOX “OFF”
1: MOX “ON”
M X P1 ;
Read 12345678910
M X ;
Answer 12345678910
M X P1 ;
NA NARROW
Set 12345678910P1 0: Fixed
P2 0: OFF
1: ON
M A P1 P2 ;
Read 12345678910
M A P1 ;
Answer 12345678910
M A P1 P2 ;
NB NOISE BLANKER STATUS
Set 12345678910P1 0: Fixed
P2 0: Noise Blanker “OFF”
1: Noise Blanker “ON”
N B P1 P2 ;
Read 12345678910
N B P1 ;
Answer 12345678910
N B P1 P2 ;
NL NOISE BLANKER LEVEL
Set 12345678910P1 0: Fixed
P2 000 - 010
N L P1 P2 P2 P2 ;
Read 12345678910
N L P1 ;
Answer 12345678910
N L P1 P2 P2 P2 ;

FT-991 CAT Operation Manual13
CAT (CompuTer Aided TrAnsCeiver)operATion
NR NOISE REDUCTION
Set 12345678910P1 0: Fixed
P2 0: Noise Reduction “OFF”
1: Noise Reduction “ON”
N R P1 P2 ;
Read 12345678910
N R P1 ;
Answer 12345678910
N R P1 P2 ;
OI OPPOSITE BAND INFORMATION
Set 12345678910P1 000-117 (Memory Channel) P2 VFO-B Frequency (Hz)
P3 ClarierDirection+:PlusShift,--:MinusShift
 ClarierOffset:0000-9999(Hz)
P4 0: RX CLAR “OFF” 1: RX CLAR “ON”
P5 0: TX CLAR “OFF” 1: TX CLAR “ON”
P6 MODE 1: LSB 2: USB 3: CW 4: FM 5: AM 6: RTTY-LSB 7: CW-R
8: DATA-LSB 9: RTTY-USB A: DATA-FM B: FM-N C: DATA-USB
D: AM-N E: C4FM
P7 0: VFO 1: Memory
P8 0: CTCSS “OFF” 1: CTCSS ENC/DEC 2: CTCSS ENC
P9 00: (Fixed)
P10 0: Simplex 1: Plus Shift 2: Minus Shift
Read 12345678910
O I ;
Answer
12345678910
O I P1 P1 P1 P2 P2 P2 P2 P2
11 12 13 14 15 16 17 18 19 20
P2 P2 P2 P2 P3 P3 P3 P3 P3 P4
21 22 23 24 25 26 27 28 29 30
P5 P6 P7 P8 P9 P9 P10 ;
OS OFFSET (REPEATER SHIFT)
Set 12345678910P1 0: Fixed
P2 0: Simplex
1: Plus Shift
2: Minus Shift
*: This command can be activated only with an FM mode.
O S P1 P2 ;
Read 12345678910
O S P1 ;
Answer 12345678910
O S P1 P2 ;
PA PRE-AMP (IPO)
Set 12345678910P1 0:Fixed
P2 0: IPO
1: AMP 1
2: AMP 2
P A P1 P2 ;
Read 12345678910
P A P1 ;
Answer 12345678910
P A P1 P2 ;
PB PLAY BACK
Set 12345678910P1 0: DVS P2 0: DVS (Playback Stop)
1: DVS (CH “1” Playback Start)
2: DVS (CH “2” Playback Start)
3: DVS (CH “3” Playback Start)
4: DVS (CH “4” Playback Start)
5: DVS (CH “5” Playback Start)
P B P1 P2 ;
Read 12345678910
P B P1 ;
Answer 12345678910
P B P1 P2 ;
PC POWER CONTROL
Set 12345678910P1 005 -100
P C P1 P1 P1 ;
Read 12345678910
P C ;
Answer 12345678910
P C P1 P1 P1 ;
PL SPEECH PROCESSOR LEVEL
Set 12345678910P1 000 -100
P L P1 P1 P1 ;
Read 12345678910
P L ;
Answer 12345678910
P L P1 P1 P1 ;

FT-991 CAT Operation Manual14
CAT (CompuTer Aided TrAnsCeiver)operATion
PR SPEECH PROCESSOR LEVEL
Set 12345678910P1 0: Speech Processor
1: Parametric Microphone Equalizer
P2 1: “OFF”
2: “ON”
P R P1 P2 ;
Read 12345678910
P R P1 ;
Answer 12345678910
P R P1 P2 ;
PS POWER SWITCH
Set 12345678910P1 0: POWER “OFF”
1: POWER “ON”
This command requires dummy data be initially sent. Then after one second and be-
fore two seconds the command is sent.
P S P1 ;
Read 12345678910
P S ;
Answer 12345678910
P S P1 ;
QI QMB STORE
Set 12345678910
Q I ;
Read 12345678910
Answer 12345678910
QR QMB RECALL
Set 12345678910
Q R ;
Read 12345678910
Answer 12345678910
QS QUICK SPLIT
Set 12345678910
Q S ;
Read 12345678910
Answer 12345678910
RA RF ATTENUATOR
Set 12345678910P1 0: Fixed
P2 0: OFF
1: ON
R A P1 P2 ;
Read 12345678910
R A P1 ;
Answer 12345678910
R A P1 P2 ;
RC CLAR CLEAR
Set 12345678910
R C ;
Read 12345678910
Answer 12345678910
RD CLAR DOWN
Set 12345678910P1 0000 - 9999 (Hz)
R D P1 P1 P1 P1 ;
Read 12345678910
Answer 12345678910

FT-991 CAT Operation Manual15
CAT (CompuTer Aided TrAnsCeiver)operATion
RG RF GAIN
Set 12345678910P1 0: Fixed
P2 000 - 255
R G P1 P2 P2 P2 ;
Read 12345678910
R G P1 ;
Answer 12345678910
R G P1 P2 P2 P2 ;
RI RADIO INFORMATION
Set 12345678910P1 0: Hi-SWR A: TX LED P2 0: OFF
3: REC 1: ON
4: PLAY
5: VFO-A TX
6: VFO-B TX
7: VFO-A RX
Read 12345678910
R I P1 ;
Answer 12345678910
R I P1 P2 ;
RL NOISE REDUCTION LEVEL
Set 12345678910P1 0: Fixed
P2 01 - 15
R L P1 P2 P2 ;
Read 12345678910
R L P1 ;
Answer 12345678910
R L P1 P2 P2 ;
RM READ METER
Set 12345678910P1 0: Depends on the front panel METER 4: ALC
1: S 5: PO
2: Depends on the front panel METER 6: SWR
(PO / COMP / ALC / SWR / ID / VDD) 7: ID
3: COMP 8: VDD
P2 0 - 255
Read 12345678910
R M P1 ;
Answer 12345678910
R M P1 P2 P2 P2 ;
RS RADIO STATUS
Set 12345678910P1 0: NORMAL MODE
1: MENU MODE
Read 12345678910
R S ;
Answer 12345678910
R S P1 ;
RT CLAR
Set 12345678910P1 0:RXClarier“OFF”
 1:RXClarier“ON”
R T P1 ;
Read 12345678910
R T ;
Answer 12345678910
R T P1 ;
RU RX CLARIFIER PLUS OFFSET
Set 12345678910P1 0000 - 9999 (Hz)
R U P1 P1 P1 P1 ;
Read 12345678910
Answer 12345678910
SC SCAN
Set 12345678910P1 0: Scan “OFF”
1: Scan “ON” (UP ward)
2: Scan “ON” (DOWN ward)
S C P1 ;
Read 12345678910
S C ;
Answer 12345678910
S C P1 ;

FT-991 CAT Operation Manual16
CAT (CompuTer Aided TrAnsCeiver)operATion
SD CW BREAK-IN DELAY TIME
Set 12345678910P1 0030 - 3000 msec
S D P1 P1 P1 P1 ;
Read 12345678910
S D ;
Answer 12345678910
S D P1 P1 P1 P1 ;
SH WIDTH
Set 12345678910P1 0: Fixed
P2 00 (See Table)
S H P1 P2 P2 ;
Read 12345678910
S H P1 ;
Answer 12345678910
S H P1 P2 P2 ;
Command Bandwidth
P2 SSB (Narrow) SSB (Wide) CW (Narrow) CW (Wide) RTTY/PSK (Narrow) RTTY/PSK (Wide)
00 (Default) 1500 Hz 2400 Hz 500 Hz 2400 Hz 300 Hz 500 Hz
01 200 Hz - 50 Hz - 50 Hz -
02 400 Hz - 100 Hz - 100 Hz -
03 600 Hz - 150 Hz - 150 Hz -
04 850 Hz - 200 Hz - 200 Hz -
05 1100 Hz - 250 Hz - 250 Hz -
06 1350 Hz - 300 Hz - 300 Hz -
07 1500 Hz - 350 Hz - 350 Hz -
08 1650 Hz - 400 Hz - 400 Hz -
09 1800 Hz 1800 Hz 450 Hz - 450 Hz -
10 - 1950 Hz 500 Hz 500 Hz 500 Hz 500 Hz
11 - 2100 Hz - 800 Hz - 800 Hz
12 - 2200 Hz - 1200 Hz - 1200 Hz
13 - 2300 Hz - 1400 Hz - 1400 Hz
14 - 2400 Hz - 1700 Hz - 1700 Hz
15 - 2500 Hz - 2000 Hz - 2000 Hz
16 - 2600 Hz - 2400 Hz - 2400 Hz
17 - 2700 Hz - 3000 Hz - 3000 Hz
18 - 2800 Hz - - - -
19 - 2900 Hz - - - -
20 - 3000 Hz - - - -
21 - 3200 Hz - - - -
SM S-METER READING
Set 12345678910P1 0: Fixed
P2 000 - 255
Read 12345678910
S M P1 ;
Answer 12345678910
S M P1 P2 P2 P2 ;
SQ SQUELCLH LEVEL
Set 12345678910P1 0: Fixed
P2 000 - 100
S Q P1 P2 P2 P2 ;
Read 12345678910
S Q P1 ;
Answer 12345678910
S Q P1 P2 P2 P2 ;
SV SWAP VFO
Set 12345678910
S V ;
Read 12345678910
Answer 12345678910

FT-991 CAT Operation Manual17
CAT (CompuTer Aided TrAnsCeiver)operATion
TS TXW
Set 12345678910P1 0: TXW “OFF”
1: TXW “ON”
T S P1 ;
Read 12345678910
T S ;
Answer 12345678910
T S P1 ;
TX TX SET
Set 12345678910P1 0: RADIO TX “OFF” CAT TX “OFF”
1: RADIO TX “OFF” CAT TX “ON”
2: RADIO TX “ON” CAT TX “OFF” (Answer)
T X P1 ;
Read 12345678910
T X ;
Answer 12345678910
T X P1 ;
UL PLL UNLOCK STATUS
Set 12345678910P1 0: PLL “Lock”
1: PLL “Unlock”
Read 12345678910
U L ;
Answer 12345678910
U L P1 ;
UP UP
Set 12345678910
U P ;
Read 12345678910
Answer 12345678910
VD VOX DELAY TIME
Set 12345678910P1 0030 - 3000 msec (10 msec multiples)
V D P1 P1 P1 P1 ;
Read 12345678910
V D ;
Answer 12345678910
V D P1 P1 P1 P1 ;
VG VOX GAIN
Set 12345678910P1 000 - 100
V G P1 P1 P1 ;
Read 12345678910
V G ;
Answer 12345678910
V G P1 P1 P1 ;
VM VFO-A TO MEMORY CHANNEL
Set 12345678910
V M ; ;
Read 12345678910
Answer 12345678910
VX VOX STATUS
Set 12345678910P1 0: VOX “OFF”
1: VOX “ON”
V X P1 ; ;
Read 12345678910
V X ;
Answer 12345678910
V X P1 ;

FT-991 CAT Operation Manual18
CAT (CompuTer Aided TrAnsCeiver)operATion
XT TX CLAR
Set 12345678910P1 0: TX CLAR “OFF”
1: TX CLAR “ON”
X T P1 ; ;
Read 12345678910
X T ;
Answer 12345678910
X T P1 ;
ZI ZERO IN
Set 12345678910(CW AUTO ZERO IN Function)
Z I ; ;
Read 12345678910
Answer 12345678910

Copyright 2015
YAESU MUSEN CO., LTD.
All rights reserved
No portion of this manual
may be reproduced without
the permission of
YAESU MUSEN CO., LTD. 1501-A0