Connectors and Signals | ||||||
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Pin No. |
| Signal | Direction |
| Function | |
| Name |
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1 |
| GND | — |
| Frame Ground | |
2 |
| TXD | OUT |
| This pin carries data from the printer. | |
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| (Return channel) | ||||
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3 |
| RXD | IN |
| This pin carries data to the printer. | |
4 |
| RTS | OUT |
| This is SPACE when the printer power is ON. | |
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| This pin is SPACE when the computer is |
5 |
| CTS | IN |
| ready to send data.The printer does not | |
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| check this pin. |
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| This pin is SPACE when the computer is |
6 |
| DSR | IN |
| ready to send data.The printer does not | |
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| check this pin. |
7 |
| GND | — |
| Signal ground. | |
8 |
| N/C |
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| Unused. | |
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| This pin is the return path for data |
9 | TTY TXDR | — |
| transmitted from the printer on the 20mA | ||
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| current loop. |
10 | TTY TXD | OUT |
| This pin carries data from the printer on the | ||
| 20mA current loop. | |||||
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| This pin is SPACE when the printer is ready |
11 |
| RCH | OUT |
| to receive data. This line carries the same | |
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| signal as pin 20. |
12 |
| N/C |
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| Unused. | |
13 |
| GND | — |
| Signal ground. | |
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| This is MARK when the printer is abnor- |
14 |
| FAULT |
| OUT |
| mal. (Refer to Error Condition Alarm Mode |
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| *1.) Or there is a paper error. |
15 ~ 16 |
| N/C |
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| Unused. | |
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| This pin is the return path for data transmit- |
17 | TTY TXDR | — |
| ted from the printer on the 20mA current | ||
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| loop. |
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| This pin is the return path for data trans- |
18 | TTY RXDR | — |
| mitted to the printer on the 20mA current | ||
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| loop. |
19 | TTY RXD | IN |
| This pin carries data to the printer on the | ||
| 20mA current loop. | |||||
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20 |
| DTR | OUT |
| This printer turns this pin SPACE when it is | |
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| ready to receive data. | ||||
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21 ~ 22 |
| N/C |
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| Unused. | |
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| This pin is the return path for data trans- |
23 | TTY RXDR | — |
| mitted to the printer on the 20mA current | ||
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| loop. |
24 | TTY TXD | OUT |
| This pin carries data from the printer on the | ||
| 20mA current loop. | |||||
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25 | TTY RXD | IN |
| This pin carries data to the printer on the | ||
| 20mA current loop. | |||||
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