| STROBE: | Active low pulse used to transfer data into the printer. | Pulse with must be between 0.5 and 500 microseconds for most printers. |
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| Dn: | Data lines, high is a one. | |
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| ACK: | Active low pulse indicates that data has been received and the printer is ready to accept more. | |
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| BUSY: | A high signal indicates that the printer cannot receive data. | |
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| PE: | A high signal indicates that the printer is out of paper (Paper End) | |
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| SELECT OUT: | A high signal indicates that the printer is on-line | |
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| AUTO FEED: | A low signal indicates to the printer that a line feed is required after each Carriage return. | This signal is used as a ground line by some manufacturers. |
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| OSCXT: | A 100-200 KHz signal used by true Centronics printers only. | |
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| +5V: | +5Vdc | Not provided by all manufacturers |
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| PRIME: | A low signal resets the printer to its power-up state and the printer buffer is cleared | |
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| FAULT: | A low signal indicates that the printer is in an off-line or error state | |
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| LINE COUNT: | Used by true Centronics printers only. | Most of the time not used |
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| SELECT IN: | A high signal indicates to the printer that a DC1/ DC3 code is valid. | This signal is used by a few manufacturers |
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