Vertex Standard FT-1000MP Constructing and Sending CAT Commands, 50 H 03 H 00 H 81 H 09 H, 0A H

CAT System Computer Control

CONSTRUCTING AND SENDING CAT COMMANDS

Example #1: Set Main VFO-A to 14.25000 MHz;

rFirst determine the opcode for the desired instruc- tion by referring to the CAT Commands Table. A good idea would be to store these opcodes within the program, so they can be looked up when the user requests the corresponding command.

rHere the instruction is “Set Main VFO Frequency,” so the opcode (last byte of the block) is 0AH. Note - “H” s following each byte value indicate hexa- decimal (base 16) values.

rBuild the four argument byte values from the de- sired frequency by breaking it into 2-digit blocks (BCD “packed decimal” format). Note that a lead- ing zero is always required in the hundreds-of-MHz place (and another in the tens-of-MHz if below 10 MHz).

rBreaking 14.250.00 MHz into its BCD component, we arrive at:

10’s	100’s	1’s	10’s	100’s	1’s	10’s	100’s
Hz	Hz	kHz	kHz	kHz	MHz	MHz	MHz
0	0	0	5	2	4	1	0
00		50		42		01
Byte 1		Byte 2		Byte 3		Byte 4

Example #2: Activate a RX Clarifier Offset of +3.5 kHz.

rClarifier settings are controlled from opcode 09H. The first four parameter bytes determine the type of offset, direction, and frequency displacement.

rAccording to the example, the first byte would be 50 (500 Hz), the second 03 (3000Hz), followed by 00H (for +offset), 81H (TX CLAR on) and then opcode 09H. Remember that the 1st and 2nd bytes are in BCD format.

rCompleting the command byte sequence, we would send, in sequence, 50H, 03H, 00H, 81H, 09H, to effect the Tx Clarifier offset.

Byte 1	Byte 2	Byte 3	Byte 4	Byte 5
50H	03H	00H	81H	09H
DATA/ARGUMENT BYTES				OPCODE

You should be getting a feel for the CAT command structuring sequence, let's move to the next step; read- ing transceiver operational data.

rInserting the 4-byte BCD-coded frequency (00, 50, 42, 01), the resulting 5-byte block should now look like this (again, in hex format):

Byte 1	Byte 2	Byte 3	Byte 4	Byte 5
00	50	42	01	0AH
DATA/ARGUMENT BYTES				OPCODE

rSend these five bytes to the transceiver, in the or- der shown in the table above - from left-to-right: 00 50 42 01 0AH.

MARK-V FT-1000MP Operating Manual page 87