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2. Software specifications
(1) External interface specifications
Communication
system
Asynchronous, 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, 7 bits, 1 stop bit
and odd parity.
O
The unit’s receive buffer has a capacity of 127
bytes.
(2) Transmitting format (PC
5
unit)
$
Data format
[STX] [discrimination] [:] [data] [ETX]
02H XX XX XX 3AH XX
.....
XX 03H
20H<XX<7FH
(XX = hexadecimal character code)
O
discrimination:
Command identifier (3 bytes)
O
::Code serving as a delimiter between the
command and data
O
data : The data code is added as and when
required.
1. A send command always starts with STX (character
code 02H).
“discrimination” which follows the command is the
command identifier. If necessary, “data” is added
after the colon (:). The command is ended with
ETX (character code 03H).
2. When STX is re-sent before ETX is sent, the unit’s
internal receive buffer is cleared (all the data
received so far is destroyed), the re-sent STX is
placed at the head, and the new data is processed.
RS-232C