IEEE1284-B Parallel

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Image:connector_cent36f.png 36 pin CENTRONICS female connector at the printer.

Pin Description Signal Source
1 Data Strobe (low) STROBE Computer
2 Data Bit 1 (LSB) D1 Computer
3 Data Bit 2 D2 Computer
4 Data Bit 3 D3 Computer
5 Data Bit 4 D4 Computer
6 Data Bit 5 D5 Computer
7 Data Bit 6 D6 Computer
8 Data Bit 7 D7 Computer
9 Data Bit 8 (LSB) D8 Computer
10 Acknowledge (low) ACK Printer
11 Busy (high) BUSY Printer
12 Paper End (high) PE Printer
13 Select (high) SEL Printer
14 Supply Ground -
15 Oscillator Transmit Printer
16 Logical Ground -
17 Chassis Ground -
18 +5 Vdc +V Printer
19 Return Data Strobe -
20 Return Data Bit 1 -
21 Return Data Bit 2 -
22 Return Data Bit 3 -
23 Return Data Bit 4 -
24 Return Data Bit 5 -
25 Return Data Bit 6 -
26 Return Data Bit 7 -
27 Return Data Bit 8 -
28 Return ACK -
29 Return BUSY -
30 Return Input Prime -
31 Input Prime (low) Computer
32 Fault (low) FAULT Printer
33 - - -
34 - - -
35 - - -
36 - - -

Signal Descriptions:

  • STROBE: Active low pulse used to transfer data into the printer. Pulse with must be between 0.5 and 500 microseconds for most printers.
  • ACK: Active low pulse indicates that data has been received and the printer is ready to accept more.
  • BUSY: A high signal indicates that the printer cannot receive data.
  • PE: A high signal indicates that the printer is out of paper (Paper End)
  • SELECT OUT: A high signal indicates that the printer is on-line
  • 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.
  • OSCXT: A 100-200 KHz signal used by true Centronics printers only.
  • +5V: +5Vdc Not provided by all manufacturers
  • PRIME: A low signal resets the printer to its power-up state and the printer buffer is cleared
  • FAULT: A low signal indicates that the printer is in an off-line or error state
  • LINE COUNT: Used by true Centronics printers only. Most of the time not used
  • LINE COUNT: See 34
  • SELECT IN: A high signal indicates to the printer that a DC1/ DC3 code is valid. This signal is used by a few manufacturers
  • Host Logic High: A high signal indicates that the host is alive (turned on). Specific IEEE 1284 signal.
  • Peripheral Logic High: A high signal indicates that the peripheral (printer) is alive (turned on). Specific IEEE 1284 signal.

References

Category:Parallel Connectors

 

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