Data Protocol; Constructing And Sending; Commands - Yaesu FT-100D Operating Manual

~&T
System Programming
£AT
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 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.
¢:l CAT DATA BYTE FORMAT ¢:l CAT 5-BYTE COMMAND STRUCTURE
There are 13 instruction opcodes for the FT-lOO, listed
in the chart on next page. Many of
these opcodes are OnJOfftoggle commands for the same action (e.g. "PTT On" and "PTT
Off'). Most of these commands require some parameter or parameters to be set. Irrespective
of the number of parameters present, every Command Block sent must consist of five bytes.
Accordingly, any
~'&T
control program must construct the five-byte block by selecting
the appropriate instruction opcode, organizing the parameters as needed, and providing
unused "dummy" argument bvtes 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-lOO CPU via the computer's serial port and the transceiver's
ACC Cable Pigtail.
All
~'&T
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.
CONSTRUCTING AND SENDING
CAT
COMMANDS
Example #1: Set the VFO frequency to 439.70 MHz
D Per the
~'&T
command table, the opcode for "Set Frequency" is OA (set by the "PI"
command byte). 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
¢:J '-'
_0_0 _ _ 0_0 _ _ 9_7 _ _ 43---,
~
Parameter Opcode
Send these five bytes to the transceiver, in the order shown above.
Example #2: Turn the Split Mode "ON"
D Per the
~'&T
command table, the opcode for "Split On/off' is 01 (hex). Placing the
opcode into the 5th data bit position, we then enter dummy values into all other param-
eter locations:
DATA 1 DATA 2 DATA 3 DATA 4 DATA 5
¢:J
,00 00 00
,~~
Dummy Data Parameter Opcode
FT-IOO
MICRO MOBILE OPERATING MANUAL
97