Control Operation A1; Commands A1; Command Description A1; Parameterdescription A1 - Kenwood TRC-80 Instruction Manual

APPENDIX
CONTROL OPERATION
Most computers handle data in the form of "bits" and
"bytes". A bit is the smallest piece of information that
the computer can handle. A byte is composed of eight
bits. This is the most convenient form for most
computer data. This data may be sent in the form of
either serial or parallel data strings. The parallel method
is faster but more complicated, while the serial method
is slower and requires less complicated equipment. The
serial form is, therefore, a less expensive alternative.
Serial data transmission uses time-division methods
over a single line. Using a single line also offers the
advantage of reducing the number of errors due to line
noise.
Only 3 lines are required theoretically for control of the
radiotelephone via the computer:
.
Transmit data
.
Receive data
...
.
Ground
From a practical standpoint, it is also necessary to
incorporate some means of controlling when this data
transfer will occur. The computer and radiotelephone
cannot be allowed to send data at the same time! The
required control is achieved by using the RTS and CTS
lines.
For example, the radiotelephone is placed into the
transmit mode whenever the character string ''TX;'' is
sent from the computer. The character string ''TX;'' is
called a command. It tells the radiotelephone to do
something. There are numerous commands available
for control of the radiotelephone. These commands
may be incorporated into a computer program written in
any high level language. Programming methods vary
from computer to computer; therefore, refer to the
instruction manuals provided with the terminal program
and computer.
COMMANDS
A command is composed of 2 alphabetical characters,
various parameters, and the terminator to signal the end
of the command.
EXAMPLE: Command to set or read the mode.
T
2
1
Parameters
t
Terminator
Commands
COMMANDDESCRIPTION
A command may consist of either lower or upper case
alphabetical characters.
PARAMETER DESCRIPTION
Parameters are used to specify information necessary
to implement the desired command. The parameters to
be used for each command are predetermined. The
number of digits assigned to each parameter is also
predetermined. If a particular parameter is not
applicable to the TRC-BO, the parameter digits should
be filled using any character except the ASCII control
codes (00 to 1Fh) and the terminator (;).
BAD COMMAND EXAMPLES:
MC09; Not enough parameters specified
(P1 is not used therefore a blank must be
entered before the memory channel.)
Not enough digits
(Memory channel 9 must be entered as
"09".)
Unnecessary characters between
parameters (an extra blank)
Too many digits
No terminator
MC_009;
MC_09
A1