RS-232C interface
Software specifications (protocol)2. Send format
[controller (PC) > VTR]
1.Communication parameters
+ Data format
CommunicationAsynchronous, full duplex
[STX] [command][:][data][ETX]
system
02hXX XX XX 3Ah XX.....XX03h
Transfer rate 300, 600, 1200, 2400, 4800 or 9600bps
Bit length 7 bits or 8 bits20H<XX<7FH
(XX=ASCII code: symbols, numbers, upper-
Stop bit 1 bitor 2 bits
case letters)
Parity bit None, odd or even
ACK codeReturnedor not returned[command]:
<Note>
This is the command identifier (3 bytes).
ACK is the code which is returned from the
A 3-byte identifier (ASCII code: symbols,
VTR to the controller when data has been
successfully sent from the controller.numbers, upper-case letters) is sent as the
command.
The underlining (__) denotes the factory setting mode.
[:]
The colon is the code serving as a delimiter
Any changes to the settings can be made using the
between the command and data.
setup menu items listed below.
[data]:
Communication
Setup menu itemData (ASCII code: symbols, numbers, upper-
parameter
case letters) can be added in the number of
Transfer rate No.205 BAUD RATEbytes required.
Bit length No.206 DATA LENGTH
+ Outline of procedure for sending data from
Stop bit No.207 STOP BIT
controller
Parity bit No.208 PARITY
ACK codeNo.209 RETURN ACK1The 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).
2When a different command is to be sent, a
response is awaited from the VTR, and then
the command is sent. (See page 124.)
3If 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.
123 |
ACEC
