43
Appendix C: Interface Pin Outs
Parallel Interface
Pin |
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| Name | Function | ||||
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1 | STROBE | Goes low for ≥0.5μs when active. | ||||||
2 |
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| DATA0 | These signals represent information for the 1st through 8th bit of parallel data, | ||||
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| respectively. Each signal is HIGH when data is logical 1, and LOW when logical | ||||
3 |
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| DATA1 | |||||
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| 0. | ||||
4 |
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| DATA2 | |||||
5 |
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| DATA3 |
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6 |
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| DATA4 |
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7 |
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| DATA5 |
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8 |
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| DATA6 |
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9 |
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| DATA7 |
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10 |
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| ACK |
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| 10μs low to acknowledge receipt of data. |
11 |
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| BUSY | Printer sets line low when ready to receive data. | ||||
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12 |
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| PAPER | High when paper runs out. | ||||
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13 | SELECT | High when printer is | ||||||
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| Not used. | |
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16 | SIGNAL GND | Signal ground | ||||||
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17 | CHASSIS | Chassis ground (isolated from signal ground) | ||||||
18 |
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| +5V | +5V DC output from printer | |||
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19 - 30 |
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| GND | Twisted pair ground return | ||||
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31 |
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| RESET |
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| Printer is reset when this signal goes low. | ||
32 |
| ERROR |
| Low when printing cannot continue due to error. | ||||
33 | EXT GND | External ground | ||||||
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34 - 36 |
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| Not used |
Optional Serial Interface
Pin | Name | Function |
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1 | GND | Printer chassis ground |
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2 | TXD | Data from printer |
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3 | RXD | Data to printer |
4 | RTS | Always space |
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5 | CTS | Space when computer is ready to send data. Printer ignores this signal. |
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6 |
| Not used. |
7 | GND | Signal ground |
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8 - 10 |
| Not used. |
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11 | RCH | Printer sets line to space when ready to receive data. Same signal as Pin 20. |
12 - 19 |
| Not used. |
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20 | DTR | Printer sets line to space when ready to receive data. |
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21 - 25 |
| Not used. |