The IEEE-1284 'C' cable pinout is shown below. The connector for
IEEE-1284C is a Male Mini Centronics [MDR36] 36 pin connector.
The C-style connector is one of three defined by the IEEE-1284 interface. The signal assignments are shown below.
| Pin # | Signal Name | Pin Description and Function |
|---|---|---|
| 1 | Busy | Busy |
| 2 | Select | Select |
| 3 | /nAck | Acknowledge |
| 4 | /nFault | Error |
| 5 | PError | Paper End |
| 6 | data0 | Address, Data Bit 0 |
| 7 | data1 | Address, Data Bit 1 |
| 8 | data2 | Address, Data Bit 2 |
| 9 | data3 | Address, Data Bit 3 |
| 10 | data4 | Address, Data Bit 4 |
| 11 | data5 | Address, Data Bit 5 |
| 12 | data6 | Address, Data Bit 6 |
| 13 | data7 | Address, Data Bit 7 |
| 14 | /nInit | Initialize |
| 15 | nStrobe | Strobe |
| 16 | /nSelectIn | Select In |
| 17 | /nAutoFd | Autofeed |
| 18 | HLH | Host 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 Pin 10 GND |
| 29 | GND | Signal Pin 11 GND |
| 30 | GND | Signal Pin 12 GND |
| 31 | GND | Signal Pin 13 GND |
| 32 | GND | Signal Pin 14 GND |
| 33 | GND | Signal Pin 15 GND |
| 34 | GND | Signal Pin 16 GND |
| 35 | GND | Signal Pin 17 GND |
| 36 | Peripheral Logic High | Signal from the Printer |
Personal Computer [PC] Parallel printer bus specification defines a
Point-To-Point asynchronous bi-directional interface. Devices may be
either 1284 compatible {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 maximum. The IEEE1284 cable
replaced the 'Centronics' cable, the Centronics interface is obsolete.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, asychronous, 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 | Busy | PtrBusy | PtrBusy | nWait | PeriphAck |
| 2 | Select | Xflag | Xflag | User defined 3 | Xflag |
| 3 | nAck | PtrClk | PtrClk | Intr | PeriphClk |
| 4 | nFault | nDataAvail | nDataAvail | User Defined 2 | nPeriphRequest |
| 5 | PError | AckDataReq | AckDataReq | User defined 1 | nAckReverse |
| 6 | Data 1 | Data 1 | Data 1 | AD1 | Data 1 |
| 7 | Data 2 | Data 2 | Data 2 | AD2 | Data 2 |
| 8 | Data 3 | Data 3 | Data 3 | AD3 | Data 3 |
| 9 | Data 4 | Data 4 | Data 4 | AD4 | Data 4 |
| 10 | Data 5 | Data 5 | Data 5 | AD5 | Data 5 |
| 11 | Data 6 | Data 6 | Data 6 | AD6 | Data 6 |
| 12 | Data 7 | Data 7 | Data 7 | AD7 | Data 7 |
| 13 | Data 8 | Data 8 | Data 8 | AD8 | Data8 |
| 14 | nInit | nInit | nInit | nInit | nReverseRequest |
| 15 | nStrobe | HostClk | HostClk | nWrite | HostClk |
| 16 | nSelectIn | 1284 Active | 1284 Active | nAStrb | 1284 Active |
| 17 | nAutoFd | HostBusy | HostBusy | nDStrb | HostAck |
| 18 | Host Logic High | -- | -- | -- | -- |
| 19 | (Busy) ground return | -- | -- | -- | -- |
| 20 | (Select) ground return | -- | -- | -- | -- |
| 21 | (nAck) ground return | -- | -- | -- | -- |
| 22 | (nFault) ground return | -- | -- | -- | -- |
| 23 | (PError) ground return | -- | -- | -- | -- |
| 24 | (Data 1) ground return | -- | -- | -- | -- |
| 25 | (Data 2) ground return | -- | -- | -- | -- |
| 26 | (Data 3) ground return | -- | -- | -- | -- |
| 27 | (Data 4) ground return | -- | -- | -- | -- |
| 28 | (Data 5) ground return | -- | -- | -- | -- |
| 29 | (Data 6) ground return | -- | -- | -- | -- |
| 30 | (Data 7) ground return | -- | -- | -- | -- |
| 31 | (Data 8) ground return | -- | -- | -- | -- |
| 32 | (nInit) ground return | -- | -- | -- | -- |
| 33 | (nStrobe) ground return | -- | -- | -- | -- |
| 34 | (nSelectIn) ground return | -- | -- | -- | -- |
| 35 | (nAutoFd) ground return | -- | -- | -- | -- |
| 36 | Peripheral Logic High | -- | -- | -- | -- |
The main IEEE-1284 bus page.
--------------------------------------------
Parallel Cable Port Pinout ....
Centronics Cable Pin-out ....
1284-A Cable Pinout .... 1284-B Cable Pinout
IEEE1284-A to 1284-B Adaptor
Pinout .. IEEE1284-A to 1284-C Adaptor
Pinout .. IEEE1284-B to 1284-C Adaptor
Pinout
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