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EPSON Stylus Pro and Pro XL
Pin assignments
Signal | Return |
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pin | pin | Signal | Direction | Description | ||||
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1 | 19 |
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| STROBE | IN | STROBE pulse to read | ||
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| data. | |
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2 | 20 |
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| DATA 1 | IN | These signals represent | ||
3 | 21 |
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| DATA 2 | IN | information in bits 0 to 7 of | ||
4 | 22 |
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| DATA 3 | IN | parallel data respectively. | ||
5 | 23 |
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| DATA 4 | IN | Each signal is at HIGH level | ||
6 | 24 |
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| DATA 5 | IN | when data is logical 1 and | ||
7 | 25 |
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| DATA 6 | IN | LOW when it is logical 0. | ||
8 | 26 |
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| DATA 7 | IN |
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9 | 27 |
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| DATA 8 | IN |
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| About a | |||
10 | 28 |
| ACKNLG | OUT | ||||
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| indicates data has been | |
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| received and the printer is | |
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| ready to accept more data. | |
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11 | 29 |
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| BUSY | OUT | A HIGH signal indicates the | ||
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| printer cannot receive data. | |
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| The signal goes HIGH in the | |
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| following cases: | |
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| 1) During data entry | |
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| (for each character) | |
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| 2) During initialization | |
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| 3) During self test and | |
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| 4) During a | |
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| state | |
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12 | 30 |
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| PE | OUT | A HIGH signal indicates the | ||
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| printer is in a | |
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| state or in an error state |
Signal | Return |
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pin | pin | Signal | Direction | Description |
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33 | - | GND | - | Same as for pins |
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34 | - | NC | - | Not used |
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35 | - | +5 V | OUT | Pulled up to +5 V through |
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| 1 KΩ resistance |
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36 | - | NC | - | Not used |
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Notes:
❏The column heading “Direction” refers to the direction of signal flow as viewed from the printer.
❏“Return pin” denotes the
❏All interface conditions are based on TTL level. Both the rise and fall times of each signal must be less than 0.2 microseconds.
❏Data transfer must be carried out by observing the ACKNLG or BUSY signal. Data transfer to this printer can be carried out only after receipt of the ACKNLG signal or when the level of the BUSY signal is LOW.
Timing chart
The figure below shows the timing chart for the parallel interface.
13 | - |
| SLCT | OUT | Pulled up to +5 V through | |
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| 1 kΩ resistance |
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| IN | When this signal is LOW, |
14 | - |
| AUTO | |||
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| FEED |
| the paper is automatically | |
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| XT |
| fed one line after printing | |
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15 | - |
| NC | - | Not used | |
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16 | - |
| GND | - | Logic ground level | |
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17 | - | CHASSIS | - | Printer’s chassis ground, |
BUSY
ACKNLG
DATA
STROBE
0.5 μs (Min.)
0 μs (Min.)
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| GND |
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| logic ground |
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18 | - |
| NC | - | Not used | |
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- | GND | - | ||||
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| ground level |
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| When this signal goes LOW, |
31 | 16 |
| INIT | IN | ||
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| the printer controller is reset |
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| to its state when the power |
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| is first turned on and the |
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| print buffer is cleared. This |
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| level is normally HIGH; its |
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| pulse width must be more |
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| than 50 μs at the receiving |
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| terminal. |
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| This signal level goes LOW | ||
32 | - | ERROR | OUT | |||
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| when the printer: |
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| 1) Is out of paper |
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| 2) Is in an error state |
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| 3) Has no ink cartridges |
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5 μs (Typ.)
0 μs (Min.)
Transition time (both the rise and the fall) of every signal must be less than 0.2 μs.
Serial Interface
The printer’s
Standard: | Based on |
Synchronization: | Asynchronous |
Bit rate: | 57.6 Kbps/230.4 Kbps |
Handshaking: | DTR and XON/XOFF protocol |
EPSON Stylus Pro and Pro | 8/1/95 | Ink Jet Printers |