This page provides the adaptor cable for the IEEE 1284 'B' connector to the IEEE 1284 'C' connector.
Refer to either of those pages for more data or the main IEEE-1284 interface page.
| Host C connector | Function | Peripheral B connector |
| 1 | Busy | 11 |
| 2 | Select | 13 |
| 3 | nAck | 10 |
| 4 | nFault | 32 |
| 5 | PError | 12 |
| 6 | Data 1 | 2 |
| 7 | Data 2 | 3 |
| 8 | Data 3 | 4 |
| 9 | Data 4 | 5 |
| 10 | Data 5 | 6 |
| 11 | Data 6 | 7 |
| 12 | Data 7 | 8 |
| 13 | Data 8 | 9 |
| 14 | nInit | 31 |
| 15 | nStrobe | 1 |
| 16 | nSelectIn | 36 |
| 17 | nAutoFd | 14 |
| 18 | Host logic high | No connection |
| 19 | Ground return for pin 1 (Busy) | 29 |
| 20 | Ground return for pin 2 (Select) | 28 |
| 21 | Ground return for pin 3 (nAck) | 28 |
| 22 | Ground return for pin 4 (nFault) | 29 |
| 23 | Ground return for pin 5 (PError) | 28 |
| 24 | Ground return for pin 6 (Data 1) | 20 |
| 25 | Ground return for pin 7 (Data 2) | 21 |
| 26 | Ground return for pin 8 (Data 3) | 22 |
| 27 | Ground return for pin 9 (Data 4) | 23 |
| 28 | Ground return for pin 10 (Data 5) | 24 |
| 29 | Ground return for pin 11 (Data 6) | 25 |
| 30 | Ground return for pin 12 (Data 7) | 26 |
| 31 | Ground return for pin 13 (Data 8) | 27 |
| 32 | Ground return for pin 14 (nInit) | 30 |
| 33 | Ground return for pin 15 (nStrobe) | 19 |
| 34 | Ground return for pin 16 (nSelectIn) | 30 |
| 35 | Ground return for pin 17 (nAutoFd) | 30 |
| 36 | Peripheral logic high | 18 |
The Personal Computer Parallel printer bus specification defines
a Point-to-Point asynchronous bi-directional interface. Devices may be
either 1284 compatible {for older parallel port devices} or 1284
compliant. The maximum recommended cable length is 25 feet max.
Centronics parallel cables run out to 12 feet. The IEEE1284 cable
replaced the 'Centronics' cable, which is obsolete.
IEEE1284 operates in five different modes: [The connector or cable does not change
with each different mode, but the function of some of the pins do]
Compatibility mode; Centronics type operation (PC to Peripheral),
providing the original (required) control signaling bits. These bits
include 8 data lines, a Strobe, a Busy, an Acknowledge, a Select, Paper
Empty, Fault, Initialize Printer, Select Printer, and a Auto Feed line.
Compatibility mode is the basic mode of operation, asynchronous, byte
wide operation with a transfer rate of between 50kBps to 150kBps.
Nibble mode; 4 bit data bus (Peripheral to PC), 8 bit data bus (PC
to Peripheral); supporting uni-directional printer interfaces. This
provides an interface which operates full speed forward and half speed in
reverse. The transfer rate is between 50kBps to 150kBps
Byte mode; 8 bit bi-directional bus. Normal port operation. The
transfer rate is between 50kBps to 150kBps
ECP; Extended Capabilities Port. Allowed the PC to send 32 bit
data to the port, than letting the port divide up the data into four 8
byte messages, improving system (PC) operation. Transfer speeds are ten
times faster then the previous modes.
EPP; Enhanced Parallel Port; Allows high-speed transfers of bytes
in either direction. EPP is used with real time controlled peripherals.
EPP transfer times are the same as ECP transfer rates.
Back to the main IEEE-1284 bus page. {This Web Site}
Centronics Connector
Pinout .. Parallel Port Connector
Pinout .. 1284-A Cable Pinout ..
1284-B Cable Pinout ..
1284-C Cable Pinout
{This Web Site}
Engineering Design Key words: IEEE-1284, Parallel printer bus specification, Peripheral Bus, Physical, Mechanical, Type, IEEE1284 Description, Brief, ICs, Integrated Circuits, Vendors, Products, Manufacturers, specification, Personal Computer, PC Bus pin out, 'A' Cable Pinout, Pin Out, Pins, Signals, Pin Number, Assignment, Specification, Standard, Defined, Constraint, Properties, Lines, Data, Labels, LPT Port, Adaptor, legacy.
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