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Yaesu FT-818ND Manual

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CAT System Programming
CAT Data Protocol
All commands sent from the computer to the transceiver consist of ve-byte blocks, with
up to 200 ms between each byte. The last byte in each block is the instruction opcode,
while the rst four bytes of each block are arguments (either parameters for that instruc-
tion, or dummy values required to pad the block out to ve bytes). Each byte consists of 1
start bit,8 data bits, no parity bit, and two stop bits.
Start
Bit
0 1 2 3 4 5 6 7
Stop
Bit
Stop
Bit
Command
Data
L.S.D.
Parameter
1
Parameter
2
Parameter
3
Parameter
4
M.S.D.
Command
à
CAT DATA BYTE FORMAT
à
CAT 5-BYTE COMMAND STRUCTURE
There are 17 instruction opcodes for the FT-818, 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 parameter or parameters to be set. Irrespec-
tive of the number of parameters present, every Command Block sent must consist of ve
bytes.
Accordingly, any CAT control program must construct the ve-byte block by selecting the
appropriate instruction opcode, organizing the parameters as needed, and providing un-
used “dummy” Eargument bytes to pad the block to its required ve-byte length (the dum-
my bytes can contain any value). The resulting ve bytes are then sent, opcode last,from
the computer to the FT-818 CPU via the computer’s serial port and the transceiver’s ACC
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 Frequency” is 01. Placing the opcode
into the 5th data bit position, we then enter the frequency into the rst four data bit posi-
tions:
DATA1 DATA2 DATA3 DATA4 DATA5
à
43 97 00 00 01
Parameter Command
Send these ve 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 position, we then enter dummy values into all other parameter locations:
DATA1 DATA2 DATA3 DATA4 DATA5
à
00 00 00 00 02
Dummy Data Command
… 67 …


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