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3. Software specifications
Protocol
1) Communication parametres
Communication system Asynchronous, full duplex
Communication speed 300/600/1200/2400/4800/9600
Bit length 7 bit/8 bit
Stop bit 1 bit/2 bit
Parity bit NONE/ODD/EVEN
ACK code ACK code returned/ACK code not returned
<Note>
The ACK code is what is returned from the VTR to the controller when data has
been successfully sent from the controller.
The underlining indicates the factory settings.
Any changes to the settings can be made using the setup menu items listed below.
Communication parametre Setup menu item
Communication speed 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
2) Send format [controller (PC) → VTR]
■ Data format
[STX] [command] [:] [data] [ETX]
02h XX XX XX 3Ah XX-XX 03h ←(ASCII code: symbols, numbers upper-case letters)
20h<XX<7Fh
•
[command]: Command identifier; a 3-byte identifier (ASCII code: symbols, numbers, upper-case letters) is sent as the
command.
•
[ : ]: This code serves 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 send procedure 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 format 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 110.)
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.
RS-232C interface