Appendix D: Serial Interface
D-1. RS-232C Connector
Pin No. | Signal name | Direction | Function |
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25 Pin | 9 Pin |
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1 |
| — | Frame ground |
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2 | 3 |
| TXD | OUT | Transmission data |
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3 | 2 |
| RXD | IN | Receive data |
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4 | 7 |
| RTS | OUT | Request To Send: The printer sets this signal to “SPACE” when it |
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| is ready to send. |
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5 |
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| N/C |
| Not used |
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| 8 |
| CTS | IN | Status of this signal is not checked. |
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6 | 6 |
| DSR | IN | Status of this signal is not checked. |
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7 | 5 | — | Signal ground |
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8~19 | 1,9 |
| N/C |
| Not used |
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20 | 4 |
| DTR | OUT | Indicates whether data receive from host is enabled or disabled. |
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| DTR/DSR Communication Mode |
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| Space when receive is enabled. |
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| Always space, except during following conditions: |
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| • Period between reset and communication enabled |
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| APPENDIX | ||
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| • During |
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21~24 |
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| N/C |
| Not used |
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25 |
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| IN | Not used |
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| INIT |
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13 |
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| 1 |
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25 |
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| 14 |
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51
96
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