(Computer-Aided Transceiver) System Protocol - Yaesu FT-920 Operating Manual

The System in the FT-920 provides control of
frequency, VFO, memory, and other settings through
the use of command codes sent from an external
personal computer. This allows multiple control op-
erations to be fully automated as a single mouse click,
or it allows a third-party software package (such as
contest logging software) to communicate with the
FT-920 without operator intervention.
The FT-920 has a built-in level converter, allowing
direct connection from the rear panel
the serial port of your computer, without the need for
an external RS-232C level converter box.
You will need a serial cable for connection to the (RS-
232C) COM port of your computer. Purchase or con-
struct a standard serial cable (not the so-called "null
modem" type), ensuring it has the correct gender and
number of pins for connection to your system.
# Com ma nd Title
S PLIT On/O ff
1
2 Recall Memory
3 Memory Op erations
4 Recall V FO
5 Copy Memory Data to VFO-A
6 Clarifier Op erations
7 Set V FO-A Frequency
8 Mode Setting
9 Update IntervalPacing
Status Update
1 0
Keyer Commands
11
Tuner On/Off
1 2
Tuner Start
1 3
Repeater Shift
1 4
Set V FO-B Frequency
1 5
B andwi dth
1 6
Tone Frequ ency
1 7
Read Meter
1 8
Read Status Flags
1 9
86
Yaesu Musen does not produce
ating software, due to the wide variety of personal
computers, operating systems, and applications in
use today. However, the FT-920 (and other Yaesu
products) are widely supported by third-party software
packages, and we recommend that you contact your
dealer for advice, or check advertisements in ama-
teur radio journals. Most software vendors also have
Home Pages on the World Wide Web containing a
wealth of information on the features and radio sup-
jack to
port for their software packages.
The information presented in this section will allow
the programmer to understand the command struc-
ture and opcodes used in the FT-920's
tem.
Opcode Command Chart
O pcode Pa ra me ter
01H P 1 xx xx xx
02H P 1 xx xx xx
03H P 1 P 2 xx xx
05H P 1 xx xx xx
06H P 1 xx xx xx
09H P 1 P 2 P 3 P 4
0AH P 1 P 2 P 3 P 4
0CH P 1 xx xx xx
0EH P 1 xx xx xx
10H P 1 xx xx P 4
70H 1B 01 P 3 xx
81H P 1 xx xx xx
82H xx xx xx xx
84H P 1 xx xx xx
8AH P 1 P 2 P 3 P 4
8CH P 1 xx xx P 4
90H P 1 P 2 xx xx
F7H P 1 xx xx xx
FAH 01 xx xx xx
Com me nt s
P1=00 : Off, P1=01: On
See Note 1
See Note 2
P1=00: VFO-A, P1=01: VFO-B
See Note 3
See Note 4
See Note 5
See Note 6
P=00~ FF(H) in 1 ms. steps. A dds delay between each
byte of all downlo aded data from the FT-920
See Note 7
See Note 8
P1=00 : Off, P1=01: On
P1=00 : SIMPLE X, P1=01: Minus Shift, P1=02: Plus Shift
See Note 9
See Note 10
S ee Note 11
See Note 12
FT-920 Operating Manual
System oper-
Sys-