APPENDIX
Appendix D: Serial Interface
D-1. RS-232C Connector
Pin No. | Signal name | Direction | Function | ||
25 Pin | 9 Pin | ||||
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1 |
| — | Frame ground | ||
2 | 3 | TXD | OUT | Transmission data | |
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3 | 2 | RXD | IN | Receive data | |
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4 | 7 | RTS | OUT | Same as DTR signal. | |
5 | 8 | N/C |
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| Not used |
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6 | 6 | DSR | IN | • DIP Switch | |
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| STAR Mode |
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| Status of this signal is not checked. |
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| ESC/POS Mode |
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| In DTR/DSR communication mode, indicates whether data receive |
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| from host is enabled or disabled. |
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| Space: Receive enabled |
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| Mark: Receive disabled |
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| (except when transmitting data by DLE EOT, and GS a) |
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| This signal is not checked in the |
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| mode. |
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| • DIP Switch |
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| This signal used for external reset. Priter is reset whenever signal |
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| is in mark state with pulse width of 1mS or more. |
7 | 5 | — | Signal ground | ||
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8~19 | 1,9 | N/C |
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| Not used |
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20 | 4 | DTR | OUT | Indicates whether data receive from host is enabled or disabled. | |
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| 1) DTR/DSR Communication Mode |
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| This signal indicates whether the printer is busy. SPACE |
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| indicates that the printer is ready to receive data, and MARK |
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| indicates that the printer is busy. The busy condition can be |
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| changed by using DIP SW |
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