The table below shows the relationship between printing being enabled or disabled, the on line/off line status, and the receipt of the data on/off control characters, DC1 or DC3.
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ON LINE | SLCT IN | DC1/DC3 | ERROR | BUSY | ACKNLG | Printing |
(Indicator |
| (Data |
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| (Disabled/ |
on) |
| on/off |
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| enabled) |
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| control) |
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On line | Low (J10 | DC1/DC3 | High | High/Low | Pulsed | Enabled |
| interface) | (no effect) |
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| each | (normal |
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| character | condition) |
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On line | High | DC1 | High | High/Low | Pulsed | Enabled |
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| Recv’d |
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| each |
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| character |
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On line | High | DC3 | High | High/Low | Pulsed | Disabled* |
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| Recv’d |
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| each |
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| character |
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Off line | High/Low | DC1/DC3 | Low | High | Not | Disabled |
| (no effect) | (no effect) |
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| generated |
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•While printing is disabled, character data is being received and acknowledged so that the printer can look for another DC1 character, which would allow it to resume printing.