3. Software specifications
Protocol
1) Communication parameters
Communication system | Asynchronous, full duplex |
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Communication speed | 300/600/1200/2400/4800/9600 |
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Bit length | 7 bit/8 bit |
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Stop bit | 1 bit/2 bit |
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Parity bit | NONE/ODD/EVEN |
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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. |
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The underlining indicates the factory settings.
Any changes to the settings can be made using the setup menu items listed below.
Communication parameter | Setup menu item | |
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Communication speed | No. 205 BAUD RATE | |
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Bit length | No. 206 | DATA LENGTH |
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Stop bit | No. 207 | STOP BIT |
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Parity bit | No. 208 | PARITY |
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ACK code | No. 209 RETURN ACK | |
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2) Send format [controller (PC) → VTR]
■Data format
[STX] | [command] [:] [data] | [ETX] | ←(ASCII code: symbols, numbers |
02h | XX XX XX 3Ah | 03h |
20h<XX<7Fh
• [command]: Command identifier; a
| command. |
• [ : ]: | This code serves as a delimiter between the command and data. |
• [data]: | Data (ASCII code: symbols, numbers, |
■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 94.)
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.
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