Signal |
| Current |
|
|
pin | loop | Direction | Description | |
|
|
|
|
|
17 | — | OUT | Transmits data. This pin | |
|
|
|
| transmits serial data from |
|
|
|
| the printer to the |
|
|
|
| computer. |
|
|
|
|
|
20 | DTR | — | OUT | Data terminal ready. This |
|
|
|
| pin indicates whether or |
|
|
|
| not the printer is ready to |
|
|
|
| receive data. If the printer |
|
|
|
| ready protocol is not |
|
|
|
| selected, the printer is |
|
|
|
| always ready to receive |
|
|
|
| data (this pin is always |
|
|
|
| HIGH). If the printer ready |
|
|
|
| protocol is selected, the |
|
|
|
| printer can accept data |
|
|
|
| when the pin level is HIGH |
|
|
|
| and cannot accept data |
|
|
|
| when the pin level is LOW. |
|
|
|
| When the DTR signal goes |
|
|
|
| LOW, the host computer |
|
|
|
| must stop sending data |
|
|
|
| within 256 characters. This |
|
|
|
| function can be set on or |
|
|
|
| off with the |
|
|
|
| mode of the printer. |
|
|
|
|
|
23 | — | — | Received data. This pin | |
|
| Return |
| transmits serial data from |
|
|
|
| the computer to the |
|
|
|
| printer. |
|
|
|
|
|
24 | — | — | Transmits data. This pin | |
|
| Return |
| transmits serial data from |
|
|
|
| the printer to the |
|
|
|
| computer. |
|
|
|
|
|
25 | — | IN | Received data. This pin | |
|
|
|
| transmits serial data from |
|
|
|
| the computer to the |
|
|
|
| printer. |
|
|
|
|
|