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2. Software specifications
(1) External interface specifications
Communication
system
Asynchronous system, full duplex
Baud rate 1200, 2400, 4800, 9600 or 19200 bps
Bit length 8 bits or 7 bits
Stop bit 1 bit or 2 bits
Parity None, odd or even
<Notes>
O
The factory settings are 9600 bps, 8 bits, 1 stop bit
and none as the parity.
O
The unit has a 127-byte receive buffer.
(2) Sending format (computer VTR)
$
Data format
[STX] [discrimination] [:] [data] [ETX]
02H XX XX XX 3AH XX
.....
XX 03H
20H<XX<7FH (XX= HEX character code)
O
discrimination
: Command identifier (3 bytes)
O
: : Code representing a delimiter
between the command and data.
O
data
: The data code is added as
required.
1. All send commands must start with STX (character
code 02H).
Next comes the discrimination, which identifies the
command.
If required, the data is added following the colon.
At the very end comes ETX (character code 03H).
2. When STX is re-sent before ETX is sent, the
receive buffer inside the VTR is cleared (all the data
received so far will be destroyed), and the data is
processed anew with the STX which was received
again at the head.
RS-232C