6.2.2Specification of interface
(1)Serial interface
Method | Asynchronous serial interface |
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Connector | DSUB |
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Protocol control | XON/XOFF and CTS/DTR |
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Receive buffer | 32K bytes |
| Receiving data stops when the remaining buffer reaches 2K |
| bytes and resumes when the remaining buffer reaches 4K bytes |
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Baud rate | 300, 600, 1200, 2400, 4800, 9600, 19200, 38400 bps |
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Bit length | 7- or |
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Stop bit | Fixed |
| When printer receives data, stop bit is fixed at 1, and when |
| printer transmits data, stop bit is fixed at 2. But computer can |
| transmit and receive data, regardless of stop bit at 1 or 2 |
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Parity | No |
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(2) Parallel interface
Method | |
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Connector | |
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Synchronous | Strobe pulse |
system |
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Handshaking | ACKNLG and BUSY signals |
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Signal level | TTL |
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