B.1 Parallel Interface
B.1.2 Interface Signals
Table shows the connector pins and corresponding input and output signals of the parallel interface. Explanation of each signal is also given in the table.
The description in [ ] indicates signal names in Auto mode and Nibble (high) mode (IEEE
Pin | In or | Signal | Description |
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1 | In | Strobe† [nStrobe] | A |
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| and latch the data on the Data 0 [1] to Data 7 [8] signal |
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| lines. |
2 | In | Data 0 [Data 1] |
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3 | In | Data 1 [Data 2] |
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4 | In | Data 2 [Data 3] |
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5 | In | Data 3 [Data 4] |
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6 | In | Data 4 [Data 5] |
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7 | In | Data 5 [Data 6] |
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8 | In | Data 6 [Data 7] |
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9 | In | Data 7 [Data 8] |
These eight signals form one byte of data sent from host computer to printer. Data 7 [8] is the most significant bit.
10 | Out | Acknowledge† [nAck] | This |
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| character received. |
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11 | Out | Busy [Busy] | When this signal is high, the printer is busy. When it is low, |
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| the printer is able to receive more data. |
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12 | Out | Paper Empty | This signal goes high when the printer runs out of paper.†† |
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| [PError] |
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13 | Out | Online (Select) [Select] | This signal goes high when the printer is online and low |
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| when the printer is offline. The signal goes low when you |
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| press the GO key to make the printer go off line.†† |
14 | In | [nAutoFd] | Ignored |
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15 | — | — | Not used |
16— 0 V DC
17— Chassis Ground
18 | — +5 V DC | This pin is used for the printer’s +5 V DC power supply |
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| (+5±0.5 V, 400 mA maximum, with fuse) |
19— Ground return
20— Ground return
21— Ground return
22— Ground return
23— Ground return
24— Ground return
25— Ground return
26— Ground return
27— Ground return
28— Ground return
29— Ground return
