DSR—Printer Port
The host asks for the status of the terminal's printer.
Note
Host software should check the printer status before entering any print mode or starting any printing function.
Format
| Exchange | Sequence | Meaning |
|---|---|---|
| Request (Host to terminal) |
CSI ? 15 n | The host asks for the current printer status. |
| Possible responses (Terminal to host) |
CSI ? 13 n | No printer. The data terminal ready (DTR) signal has not been asserted on the printer port since the last power-up or reset. |
| CSI ? 10 n | Printer ready. DTR is asserted on the printer port. | |
| CSI ? 11 n | Printer not ready. DTR is not currently asserted on the printer port. | |
| CSI ? 18 n | Printer busy. DTR is asserted on the printer port, but the other session is using the printer. In VT Level 1, the terminal sends the printer not ready sequence above. |
|
| CSI ? 19 n | Printer assigned to other session. DTR is asserted on the printer port, but the printer is assigned to the other session. The printer is not available to this session. In VT100 mode, the terminal sends the no printer sequence above. |