Yaesu FT-991 CAT Reference Book page 2

CAT
( C
ompuTer
O
verview
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
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 configuration). 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 figure 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.
A T
ided
(Refer to figure 1)
o
)
rAnsCeiver
C
OnnectiOn
⑨
⑤
Pin No. Pin Name
 N/A
‚ SERIAL OUT
ƒ
SERIAL IN
„ N/A

GND
† N/A
‡
RTS
ˆ CTS
‰
N/A
Personal Computer
COM
Personal Computer
1
perATion
⑧ ⑦ ⑥
④ ③ ② ①
I/O Function
--- ---
Outputs the Serial Data from
Output
the transceiver to the computer.
Inputs the Serial Data from the
Input
computer to the transceiver.
--- ---
--- Signal Ground
--- ---
--- ---
--- ---
--- ---
FT-991
RS-232C "Straight" Cable
Figure 1
FT-991
USB
USB Cable
Figure 2
FT-991 CAT Operation Manual