6
Chapter 6 Interfaces
Serial Interface
Specifications
Transmission Method
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| Baud Rate | 2400, 4800, 9600, 19200 |
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| Data Length | 7 or 8 bits |
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| Start Bit | 1 bit |
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| Stop Bit |
| Receiving 1 bit; Transmitting | 2 bits or more | |||
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| Parity |
| Even, Odd, No Parity |
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| Connector | Printer Side Compatible with DDK | |||||
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Signal Lines and Pin Arrangement |
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| 13 |
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| 1 | ||
| 25 |
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| 14 | |||
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| Pin No. | Signal Name | Direction |
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| DTR/DSR | ||
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| F.GND |
| Connects the Host CPU |
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| and printer. |
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| Sends transmission data |
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| 2 |
| TXD | OUT | and |
| Not used. | |
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| signals to the Host CPU |
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| from the printer. |
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| Transmission data from |
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| RXD | IN | the Host CPU to the |
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| printer. |
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| 4 |
| RTS | OUT | Pulls up the signal to |
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| +10V at 3.3k ohms. |
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| Data are sent when the |
| 6 |
| DSR | IN | Not used. |
| status information send | |
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| signal is “HIGH.” |
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| S.GND |
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| DTR | OUT | Always HIGH. |
| LOW when Busy. | |
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| HIGH when Ready. | |||||
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| 25 |
| INIT | IN(*1) | Printer's Reset signal. |
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•IN indicates a signal from the Host to the printer. OUT indicates a signal from the printer to the Host.
*1 25pin, INIT is HIGH or the
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