The Original IBM PC Parallel Port Pin-Out [also known now as the 'A'
connector], was replaced by IEEE-1284 cable [25 Pin D-Sub on the Host
side].
The IEEE-1284 'A' cable is backwards compatible with the original IBM
Personal Computer [PC] Parallel Port cable and has the same pinout.
The IEEE-1284-B connector is designed to replace the Centronics
pinout
The IEEE 1284-B: connector is a Female 36 pin ribbon connector (.0850
center line) Centronics, Bale locks [Peripheral connector, Printer
side].
The IEEE-1284 'B' cable pin-out or signal assignments are shown below.
| Pin Number | Signal Name | Pin Description and Function |
|---|---|---|
| 1 | nStrobe | Strobe |
| 2 | data0 | Address, Data Bit 0 |
| 3 | data1 | Address, Data Bit 1 |
| 4 | data2 | Address, Data Bit 2 |
| 5 | data3 | Address, Data Bit 3 |
| 6 | data4 | Address, Data Bit 4 |
| 7 | data5 | Address, Data Bit 5 |
| 8 | data6 | Address, Data Bit 6 |
| 9 | data7 | Address, Data Bit 7 |
| 10 | /nAck | Acknowledge |
| 11 | Busy | Busy |
| 12 | PError | Paper End |
| 13 | Select | Select |
| 14 | /nAutoFd | Autofeed |
| 15 | GND | Signal Ground |
| 16 | GND | Logic Ground |
| 17 | GND | Chassis Ground |
| 18 | PLH | Peripheral Logic High |
| 19 | GND | Signal pin 1 GND |
| 20 | GND | Signal pin 2 GND |
| 21 | GND | Signal pin 3 GND |
| 22 | GND | Signal pin 4 GND |
| 23 | GND | Signal pin 5 GND |
| 24 | GND | Signal pin 6 GND |
| 25 | GND | Signal pin 7 GND |
| 26 | GND | Signal pin 8 GND |
| 27 | GND | Signal pin 9 GND |
| 28 | GND | Signal pins 10, 12, 13 GND |
| 29 | GND | Signal pin 11, 32 GND |
| 30 | GND | Signal pins 14, 31, 36 GND |
| 31 | /nInit | Initialize |
| 32 | /nFault | Error |
| 33 | GND | Signal Ground |
| 34 | GND | Signal Ground |
| 35 | GND | Signal Ground |
| 36 | /nSelectIn | Select In |
Personal Computer [PC] Parallel printer bus specification defines a
Point-To-Point asynchronous bi-directional interface. Devices may be
either 1284 compatible {the older parallel port devices} or 1284
compliant. The maximum recommended length for a printer cable is 25 feet.
Centronics parallel cables run out to 12 feet. The IEEE1284 cable
replaced the 'Centronics' cable, the Centronics cable is obsolete.
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.
| Pin | Compatibility mode | Nibble mode | Byte mode | EPP mode | ECP mode |
| 1 | nStrobe | HostClk | HostClk | nWrite | HostClk |
| 2 | Data 1 | Data 1 | Data 1 | AD1 | Data 1 |
| 3 | Data 2 | Data 2 | Data 2 | AD2 | Data 2 |
| 4 | Data 3 | Data 3 | Data 3 | AD3 | Data 3 |
| 5 | Data 4 | Data 4 | Data 4 | AD4 | Data 4 |
| 6 | Data 5 | Data 5 | Data 5 | AD5 | Data 5 |
| 7 | Data 6 | Data 6 | Data 6 | AD6 | Data 6 |
| 8 | Data 7 | Data 7 | Data 7 | AD7 | Data 7 |
| 9 | Data 8 | Data 8 | Data 8 | AD8 | Data8 |
| 10 | nAck | PtrClk | PtrClk | Intr | PeriphClk |
| 11 | Busy | PtrBusy | PtrBusy | nWait | PeriphAck |
| 12 | PError | AckDataReq | AckDataReq | User defined 1 | nAckReverse |
| 13 | Select | Xflag | Xflag | User defined 3 | Xflag |
| 14 | nAutoFd | HostBusy | HostBusy | nDStrb | HostAck |
| 15 | Signal Ground | -- | -- | -- | -- |
| 16 | Logic Ground | -- | -- | -- | -- |
| 17 | Chassis Ground | -- | -- | -- | -- |
| 18 | Peripheral Logic High | -- | -- | -- | -- |
| 19 | (nStrobe)ground return | -- | -- | -- | -- |
| 20 | (Data 1)ground return | -- | -- | -- | -- |
| 21 | (Data 2)ground return | -- | -- | -- | -- |
| 22 | (Data 3)ground return | -- | -- | -- | -- |
| 23 | (Data 4) ground return | -- | -- | -- | -- |
| 24 | (Data 5) ground return | -- | -- | -- | -- |
| 25 | (Data 6) ground return | -- | -- | -- | -- |
| 26 | (Data 7) ground return | -- | -- | -- | -- |
| 27 | (Data 8) ground return | -- | -- | -- | -- |
| 28 | (nACK, PError, Select) ground return | -- | -- | -- | -- |
| 29 | (Busy, nFault) ground return | -- | -- | -- | -- |
| 30 | (nAutoFd, nSelectIn, nInit) ground return | -- | -- | -- | -- |
| 31 | nInit | nInit | nInit | nInit | nReverseRequest |
| 32 | nFault | nDataAvail | nDataAvail | User Defined 2 | nPeriphRequest |
| 33 | Ground | -- | -- | -- | -- |
| 34 | Ground | -- | -- | -- | -- |
| 35 | Ground | -- | -- | -- | -- |
| 36 | nSelectIn | 1284 Active | 1284 Active | nAStrb | 1284 Active |
Back to the main IEEE-1284 bus page.
Parallel Cable Port Pinout ....
Centronics Cable Pin-out ....
1284-A Cable Pinout .... 1284-C Cable Pinout
{This Web Site}
IEEE1284-A to 1284-B Adaptor
Pinout .. IEEE1284-A to 1284-C Adaptor
Pinout .. IEEE1284-B to 1284-C Adaptor
Pinout
Electronic Engineering Design Key words: IEEE-1284, IEEE1284-B, Parallel printer bus specification, Specs, Peripheral Bus, Physical, Mechanical, Type, IEEE1284 Description, Brief, ICs, Integrated Circuits, Vendors, Products, Manufacturers, specification, Personal Computer, PC Bus pin out, LPT Port, Cable Pinout, Computer Port, Signals, Pin Number, Assignment, Specification, Standard, Defined, Constraint, Properties, Lines, Data, Labels.
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