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| Pin No. | Signal name | Direction | Function |
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| Star mode |
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| Data terminal ready signal. |
SERIAL |
| 5 | SG | — | |
| Signal ground | ||||
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| When the printer is ready to receive data, this |
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| signal changes to “SPACE”. |
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| 6 | DSR | IN | Signal line that indicates whether the host can |
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| ||||
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| receive data |
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| Space : Host can receive data |
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| Mark : Host cannot receive data |
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| Does not confirm the status of this signal in XON/ |
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| XOFF communication or STAR mode. |
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| This signal line can be used as an external reset |
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| signal by setting the DIP switches. A pulse width of |
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| 1 ms or more mark state activates reset. |
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| 7 | RTS | OUT | Same as DTR signal. |
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| 8 | INIT | IN | This signal line can be used as an external reset |
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| signal by setting the DIP switches. A pulse width of |
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| 1 ms or more space state activates reset. |
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| 9 | FAULT | OUT | In the Star mode, the printer will enter the mark |
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| state during the following errors: no paper, head up, |
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| cutter error. In ESC/POS mode, this is normally |
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| space. |
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– 8 –
