FT-450D CAT O
PERATION
R
EFERENCE
B
OOK
CAT
(C
OMPUTER
A
IDED
T
RANSCEIVER
)
O
PERATION
O
VERVIEW
The CAT (Computer Aided Transceiver) System in the
FT-450D
provides control of frequency, VFO, memory,
and other settings such as dual-channel memories and di-
versity reception using an external personal computer. This
allows multiple control operations to be fully automated
as single mouse clicks or keystroke operations on the com-
puter keyboard.
The
FT-450D
has a built-in level converter, allowing di-
rect connection from the rear-panel
CAT
jack to the serial
port of your computer without the need of any external
boxes. You will need a serial cable for connection to the
RS-232C (serial or COM port) connector on your com-
puter. 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 configuration). If your com-
puter uses a custom connector, you may have to construct
the cable. In this case, refer to the technical documenta-
tion supplied with your computer for correct data connec-
tion.
YAESU does not produce CAT System operating soft-
ware due to the wide variety of personal 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 cus-
tomize programs later on for your operating needs and
discover the true operating potential of this system.
Page 1
CAT J
ACK
P
IN
N
O
.
P
IN
N
AME
N/A
SERIAL OUT
SERIAL IN
N/A
GND
N/A
RTS
CTS
N/A
F
UNCTION
---
Outputs the Serial Data from the
transceiver to the computer.
Inputs the Serial Data from the
computer to the transceiver.
---
Signal Ground
---
When the computer is not ready
to receive data, this port goes to
“L” for inhibit the transmit data
from the transceiver.
When the transceiver is not ready
to receive data, this port goes to
“L” for inhibit the transmit data
from the computer.
---
I/O
---
Output
Input
---
---
---
Input
Output
---
INPUT
DC 13.8V
22A
ANT
GND
EXT
SPKR
CAT
LINEAR
TUNER
DATA
COM
CA
T
RS-232C “Straight” Cable
