Yaesu FT-847 Operating Manual page 95

CAT
CAT Data Protocol
Serial data is passed via the
panel at a transfer rate set via Menu #37 (4800, 9600,
or 57600 bps). While data is being transferred, the
CAT
icon on the LCD will appear momentarily, dis-
appearing when the data flow is terminated.
All commands sent from the computer to the trans-
ceiver consist of five-byte blocks, with up to 200 ms
between each byte. The last byte in each block is the
instruction opcode, while the first four bytes of each
block are arguments (either parameters for that instruc-
tion, or dummy values required to pad the block out to
five bytes). Each byte consists of 1 start bit, 8 data
bits, no parity bit, and two stop bits.
Start
0 1 2 3
B it
CAT
D
ATA
L.S.D.
Command Parameter
Parameter
Data 2
1
CAT
5-B C
YTE
There are 25 instruction opcodes for the FT-847, listed
in the chart on previous page. Many of these opcodes
are On/Off toggle commands for the same action (e.g.
"PTT On" and "PTT Off").Most of these commands
require some parameter or parameters to be set. Irre-
spective of the the number of parameters present, ev-
ery Command Block sent must consist of five bytes.
CAT
Accordingly, any control program must construct
the five-byte block by selecting the appropriate instruc-
tion opcode, organizing the parameters as needed, and
providing unused "dummy" argument bytes to pad the
block to its required five-byte length (the dummy bytes
can contain any value). The resulting five bytes are
then sent, opcode last, from the computer to the FT-
847 CPU via the computer's serial port and the
CAT
transceiver's jack.
CAT
All data values are hexadecimal.
Note that, unlike most other Yaesu transceivers, the
FT-847 serial data cable is a "null modem" ("crossed")
type, not a "straight" serial data cable.
FT-847 O
PERATING
( C
A
OMPUTER IDED
CAT
jack on the rear
S top S top
4 5 6 7
B it B it
B F
YTE ORMAT
Parameter Parameter M.S.D.
3 4 C
OMMAND
S
OMMAND TRUCTURE
M
ANUAL
) S
T
RANSCEIVER
Constructing and Sending
CAT
Commands
Example #1:
Set the Main VFO frequency to 439.70 MHz
r Per the CAT
"S F
ET REQUENCY TO
the "P1" command byte). Placing the opcode
into the 5th data bit position, we then enter the
frequency into the first four data bit positions:
Send these five bytes to the transceiver, in the
order shown above.
Example #2:
Turn the "S
ATELLITE
r Per the CAT command table, the opcode for "S
S M
ATELLITE
opcode into the 5th data bit position, we then
enter dummy values into all other parameter lo-
cations:
Send these five bytes to the transceiver, in the
order shown above.
CTCSS Tone Data
Freq. Freq.
D1
(Hz) (Hz)
67.0 3F 94.8
69.3 39 97.4
71.9 1F 100.0
74.4 3E 103.5
77.0 0F 107.2
79.7 3D 110.9
82.5 1E 114.8
85.4 3C 118.8
88.5 0E 123.0
91.5 3B 127.3
P
YSTEM ROGRAMMING
command table, the opcode for
M B " is 01 (set by
AIN AND
" Mode "O "
N
O " is 4E (hex). Placing the
ODE N
Freq. Freq.
D1 D1
(Hz) (Hz)
1D 131.8 09 186.2
3A 136.5 18 192.8
0D 141.3 08 203.5
1C 146.2 17 210.7
0C 151.4 07 218.1
1B 156.7 16 225.7
0B 162.2 06 233.6
1A 167.9 15 241.8
0A 173.8 05 250.3
19 179.9 14 •|
ET
D1
04
13
03
12
02
11
01
10
00
•|
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