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| APPENDIX | |||
Connectors and Signals (Serial Interface) |
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Pin no. |
| Signal name |
| I/O |
| Function |
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| direction |
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| |
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1 |
|
| — |
| Frame ground | |
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2 |
| TXD |
| OUT |
| Transmitted data |
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3 |
| RXD |
| IN |
| Received data |
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4 |
| RTS |
| OUT |
| Data transmission request signal. This |
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| is always “SPACE” when the printer is |
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| turned on. |
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5 |
| CTS |
| IN |
| This signal changes to “SPACE” when |
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| host computer is ready to transmit data. |
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| (In this instance, the printer does not |
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| check this signal.) |
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6 |
| N/C |
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| Not connected |
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7 |
|
| — |
| Signal ground | |
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8 |
| N/C |
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| Not connected |
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| N/C |
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| This pin is used when using the op- | |
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| tional interface board. |
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11 |
| RCH |
| OUT |
| This signal changes to “SPACE” when |
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| the printer is ready to receive data. (The |
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| signal line is same as pin 20.) |
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12 |
| N/C |
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| Not connected. |
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13 |
|
| — |
| Signal ground | |
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14 |
| FAULT |
| OUT |
| When a printer error occurs (such as |
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| paper out, mechanical error, etc.), this |
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| signal is set to “MARK”. |
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15 |
|
| OUT |
| Diode coupled TXD | |
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16 |
|
| OUT |
| Diode coupled DTR | |
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17 to 19 |
| N/C |
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| This pin is used when using the op- |
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| tional interface board. |
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20 |
| DTR |
| OUT |
| Data terminal ready signal. When the |
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| printer is ready to receive data, this |
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| signal changes to “SPACE”. |
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| N/C |
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| Not connected | |
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23 to 25 |
| N/C |
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| This pin is used when using the op- |
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| tional interface board. |
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APPENDIX
Serial interface connector
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