![background image](http://html2.mh-extra.com/html/yaesu/ft-757gx-ii/ft-757gx-ii_technical-supplement_3110161012.webp)
CAT SYSTEM SER IAL I NTER FACE DATA MA N U A L
The CAT (Computer-Aided Transceiver) System in
the FT-757GX allows use of an external micro
computer to control the memory and operating
frequency functions of the transceiver. Control
signals are passed to the transceiver on a serial data
line, accessible at the EXT CNTL jack on the rear
of the transceiver. Yaesu offers a number of
different Interface Units for making the neces-
EXT CNTL PINOUT
A/D,
PIO
510
PIN
NAME
1
GND
EXTERNAL INTERFACE
PTO·
SOLA
UFFER
sary data format conversions to connect some of
the common brands of microcomputers. Software
is provided with some of the Yaesu Interface
Units when they are designed for use with one
specific microcomputer. The EXT CNTL jack
also provides access to the receiver AGC line,
for application in user's programs.
FT·757GX
EX CNTL
JACK
BUFFER
AGC LINE
SI
2
3
SI
AGC
Serial Input: accepts standard TTL-level data.
Automatic Gain Control: analog signal output ranging
from +0.4V DC during strong signal reception, to
+2.6V DC when no signal is being received.
DATA TIMING FORMAT
(4800 bits/second)
Start
Byte
bit
D0
DI
D2
D3
D4
D5
D6
Stop bit
��;
n)
s
--t
r
M
208
µs
5 -byte Command
LSD (D
\])
@
M
SD
@
Format
Shown below are examples of two basic types of
commands. Each is five bytes in length.
Frequency Enter Command
(Example: to set 14.25000
MHz)
00
50
42
01
0A
Frequency
In
!
truction
Parameter
(freq. set)
Frequency Step Command
(Example: to step up 500 k
Hz
)
00
00
00
00
07
Parameter
(dummy
(500UP)
- 9 -
Содержание FT-757GX II
Страница 1: ...FT 757GX TECHNICAL SUPPLEMENT YAESU MUSEN CO LTD C P 0 BOX 1500 TOKYO JAPAN...
Страница 4: ......
Страница 26: ...DISPLAY UNIT 0 DIAL UNIT Inside Front Panel 23...
Страница 42: ...LOCAL U N IT PARTS LAYOUT solder side 39...
Страница 49: ...1 00W PA U N IT PARTS LAYOUT Component side Solder side 44...
Страница 51: ...1 0W PA U N IT PARTS LAYOUT 46 Component side Solder side...
Страница 55: ...MEMO 50...
Страница 70: ...YA E SU v E3 8 9 0 1 8 4 E 2 8 4 0 6 P...