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RS-232C interface
Software specifications (protocol)
1.
Communication parameters
Communication
Asynchronous, full duplex
system
Transfer rate
300, 600, 1200, 2400, 4800 or 9600 bps
Bit length
7 bits or 8 bits
Stop bit
1 bit or 2 bits
Parity bit
None, odd or even
ACK code
Returned or not returned
<Note>
ACK is the code which is returned from the
VTR to the controller when data has been
successfully sent from the controller.
The underlining (__) denotes the factory setting mode.
Any changes to the settings can be made using the
setup menu items listed below.
Communication
parameter
Transfer rate
No.205 BAUD RATE
Bit length
No.206 DATA LENGTH
Stop bit
No.207 STOP BIT
Parity bit
No.208 PARITY
ACK code
No.209 RETURN ACK
Setup menu item
2. Send format
[controller (PC) > VTR]
∫ Data format
[STX] [command]
02h
XX XX XX
20H<XX<7FH
(XX=ASCII code: symbols, numbers, upper-
case letters)
[command]:
This is the command identifier (3 bytes).
A 3-byte identifier (ASCII code: symbols,
numbers, upper-case letters) is sent as the
command.
[:]
The colon is the code serving as a delimiter
between the command and data.
[data]:
Data (ASCII code: symbols, numbers, upper-
case letters) can be added in the number of
bytes required.
∫ Outline of procedure for sending data from
controller
1 The send command starts with STX (start of
text = 02h). The command is then identified
by COMMAND which follows, and the data is
added as required.
The command ends with ETX (end of text =
03h).
2 When a different command is to be sent, a
response is awaited from the VTR, and then
the command is sent. (See page 124.)
3 If STX is sent again before ETX is sent, the
receive data buffer inside the VTR is cleared.
A command error is returned to the
controller, and the data is newly processed
with STX which was received again at the
head.
[:]
[data]
[ETX]
3Ah XX ..... XX
03h
123
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