Pin No. | Signal | Name | Direction* |
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| High impedance (‘SPACE’) | ||
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| between pin No. 17 and No | ||
17 | o u t | 24 or an | |||||
across pin No. 17 and No. | |||||||
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| 24 indicates that the printer | ||
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| is ready to accept data. Low | ||
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| impedance (‘MARK’) or an | ||
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24 | T T F T X D | — | indicates that the printer is | ||||
Return |
| busy. Operator can invert | |||||
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| the polarity of this signal | ||
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| with | jumper J5. | |
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25 | T T Y _ R X D | I n | Input | data of serial Current | |||
23 | T e | x t | — | Loop. | |||
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R e t u r n |
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Note
• The column heading “Direction” refers to the direction of signal flow as viewed from the printer.
•All signals except
20