Bedienungsanleitung Yaesu ft-897D (Seite 65 von 76) (Englisch)

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Page 63FT-897D OPERATING MANUAL

The FT-897D’s CAT System allows the transceiver to be

controlled by a personal computer. This allows multiple

control operations 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-897D

without (redundant) operator intervention.

The Optional CAT Interface Cable CT-62 is a connection

cable for the FT-897D and your computer. The CT-62 has a

built-in level converter, allowing direct connection from the

rear panel CAT/LINEAR jack to the serial port of your com-

puter, without the need for an external RS-232C level con-

verter box.

Vertex Standard does not produce CAT System operating

software, due to the wide variety of personal computers,

operating systems, and applications in use today.

The information presented in this section will allow the pro-

grammer to understand the command structure and opcodes

used in the FT-897D’s CAT System.

CAT Data Protocol

All commands sent from the computer to the transceiver

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 instruction, 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.

There are 17 instruction opcodes for the FT-897D, listed in

the chart on next 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 param-

eter or parameters to be set. Irrespective of the number of

parameters present, every Command Block sent must con-

sist of five bytes.

Accordingly, any CAT control program must construct the

five-byte block by selecting the appropriate instruction

opcode, organizing the parameters as needed, and provid-

ing 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-897D CPU via the computer’s

serial port and the transceiver’s CAT/LINEAR jack.

All CAT data values are hexadecimal

Constructing and Sending CAT Commands

Example #1: Set the VFO frequency to 439.70 MHz

❒ Per the CAT command table, the opcode for “Set Fre-

quency” is 01. Placing the opcode into the 5th data bit

position, we then enter the frequency into the first four

data bit positions:

DATA 1 DATA 2 DATA 3 DATA 4 DATA 5

43 97 00 00 01

Parameter Command

Send these five bytes to the transceiver, in the order

shown above.

Example #2: Turn the Split Mode “On”

❒ Per the CAT command table, the opcode for “Split On/

off” is 02. Placing the opcode into the 5th data bit posi-

tion, we then enter dummy values into all other param-

eter locations:

DATA 1 DATA 2 DATA 3 DATA 4 DATA 5

00 00 00 00 02

Parameter Command

CAT

(

COMPUTER AIDED TRANSCEIVER

)

PERATION

CT-62 (Option)

RS-232

CAT

/LINEAR

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