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Convert data from a parallel port to serial communication. Connect between a computer and printer without any modifications.

Serial. The serial port does not suffer the same problems of the parallel port. The behavior of the serial port has been standardized across computers so there are no.

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A parallel port is a type of interface found on computers personal and otherwise for connecting peripherals. In computing, a parallel port is a parallel.

Serial and Parallel cables including Printer Cables, Null Modem Cables, AT Modem Cables, GPIB and more.

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SIIG.com is a leading manufacturer of IT connectivity solutions, including Serial ATA and Ultra ATA Controllers, FireWire, USB, and legacy I/O adapters.

LPT redirects here. For other uses, see LPT disambiguation.

Printer port redirects here. For other uses, see Printer port disambiguation.

This article is about the Centronics style port. For the concept in general, see Parallel communications.

Micro ribbon 36 pin female, such as on printers and on some computers, particularly industrial equipment and early pre-1980s personal computers.

Mini-Centronics 36 pin male connector top with Micro ribbon 36 pin male Centronics connector bottom

A parallel port is a type of interface found on computers personal and otherwise for connecting peripherals. In computing, a parallel port is a parallel communication physical interface. It is also known as a printer port or Centronics port. It was an industry de facto standard for many years, and was finally standardized as IEEE 1284 in the late 1990s, which defined the Enhanced Parallel Port EPP and Extended Capability Port ECP bi-directional versions. Today, the parallel port interface is seeing decreasing use because of the rise of Universal Serial Bus USB devices, along with network printing using Ethernet.

The parallel port interface was originally known as the Parallel Printer Adapter on IBM PC-compatible computers. It was primarily designed to operate a line printer that used IBM s 8-bit extended ASCII character set to print text, but could also be used to adapt other peripherals. Graphical printers, along with a host of other devices, have been designed to communicate with the system.

The term Centronics port now commonly refers to an IEEE-1284 Type B or 36-pin micro ribbon interface. The first parallel interface for printers was introduced with the Centronics Model 101 printer in 1970. 2 The interface was developed by Dr. An Wang, Robert Howard and Prentice Robinson at Centronics. Wang had a surplus stock of 20,000 Amphenol 36-pin micro ribbon connectors that were originally used for one of their early calculators, which they used to create the Centronics interface on their computers. The connector has become so closely associated with Centronics that it is now popularly known as the Centronics connector.

The Centronics parallel interface quickly became an industry de facto standard; manufacturers of the time tended to use various connectors on the system side, so a variety of cables were required. For example, early VAX systems used a DC-37 connector, NCR used the 36-pin micro ribbon connector, Texas Instruments used a 25-pin card edge connector and Data General used a 50-pin micro ribbon connector.

When IBM implemented the parallel interface on the IBM PC, they used the DB-25F connector at the PC-end of the interface, creating the now familiar parallel cable with a DB25M at one end and a 36 pin micro ribbon connector at the other. HP adopted Centronics parallel on their printer models and introduced a bidirectional version known as Bitronics on the LaserJet 4 in 1992. The Bitronics and Centronics interfaces were superseded by the IEEE 1284 standard in 1994.

Centronics parallel is generally compliant with IEEE 1284 compatibility mode. The original Centronics implementation called for the busy lead to toggle with each received line of data busy by line, whereas IEEE 1284 calls for busy to toggle with each received character busy by character. Some host systems or print servers may use a strobe signal with a relatively low voltage output or a fast toggle. Any of these issues might cause no or intermittent printing, missing or repeated characters or garbage printing. Some printer models may have a switch or setting to set busy by character; others may require a handshake adapter.

Dataproducts introduced a very different implementation of the parallel interface for their printers. It used a DC-37 connector on the host side and a 50 pin connector on the printer side either a DD-50 sometimes incorrectly referred to as a DB50 or the block shaped M-50 connector; the M-50 was also referred to as Winchester. 3 4 Dataproducts parallel was available in a short-line for connections up to 50 feet 15 m and a long-line version for connections from 50 feet 15 m to 500 feet 150 m. The Dataproducts interface was found on many mainframe systems up through the 1990s, and many printer manufacturers offered the Dataproducts interface as an option.

IBM released the IBM Personal Computer in 1981 and included a variant of the Centronics interface only IBM logo printers rebranded from Epson could be used with the IBM PC. 5 IBM standardized the parallel cable with a DB25F connector on the PC side and the Centronics connector on the printer side. Vendors soon released printers compatible with both standard Centronics and the IBM implementation.

The original IBM parallel printer adapter for the IBM PC was designed to support 8-bit data bidirectionally in 1981. This feature was removed in later revisions of the hardware, so that the data lines could only be used to output data. Years later in 1987, IBM reintroduced the bidirectional interface with its IBM PS/2 series, where it could be enabled or disabled for compatibility with applications hardwired not to expect a printer port to be bidirectional. HP introduced their version of bidirectional, known as Bitronics, on the LaserJet 4 in 1992. The Bitronics and Centronics interfaces were superseded by the IEEE 1284 standard in 1994.

A wide variety of devices were eventually designed to operate on a parallel port. Most devices were uni-directional one-way devices, only meant to respond to information sent from the PC. However, some devices such as Zip drives were able to operate in bi-directional mode. Printers also eventually took up the bi-directional system, allowing various status report information to be sent.

Before the advent of USB, the parallel interface was adapted to access a number of peripheral devices other than printers. Probably one of the earliest devices to use parallel were dongles used as a hardware key form of software copy protection. Zip drives and scanners were early implementations followed by external modems, sound cards, webcams, gamepads, joysticks, external hard disk drives and CD-ROM drives. Some of the earliest portable MP3 players required a parallel port connection for transferring songs to the device. 6 Adapters were available to run SCSI devices via parallel. Other devices such as EPROM programmers and hardware controllers could be connected via the parallel port.

Most PC-compatible systems in the 1980s and 1990s had one to three ports, with communication interfaces defined like this:

Logical parallel port 1: I/O port 0x3BC, IRQ 7 usually in monochrome graphics adapters

Logical parallel port 2: I/O port 0x378, IRQ 7 dedicated IO cards or using a controller built into the mainboard

Logical parallel port 3: I/O port 0x278, IRQ 5 dedicated IO cards or using a controller built into the mainboard

If no printer port is present at 0x3BC, the second port in the row 0x378 becomes logical parallel port 1 and 0x278 becomes logical parallel port 2 for the BIOS. Sometimes, printer ports are jumpered to share an interrupt despite having their own IO addresses i.e. only one can be used interrupt-driven at a time. In some cases, the BIOS supports a fourth printer port as well, but the base address for it differs significantly between vendors. Since the reserved entry for a fourth logical printer port in the BIOS Data Area BDA is shared with other uses on PS/2 machines and with S3 compatible graphics cards, it typically requires special drivers in most environments. Under DR-DOS 7.02 the BIOS port assignments can be changed and overridden using the LPT1, LPT2, LPT3 and optionally LPT4 CONFIG.SYS directives.

DOS-based systems make the logical parallel ports detected by the BIOS available under device names such as LPT1, LPT2 or LPT3 corresponding with logical parallel port 1, 2, and 3, respectively. These names derive from terms like Line Print Terminal, Local Print Terminal, or Line PrinTer. A similar naming convention was used on ITS, DEC systems, as well as in CP/M and 86-DOS LST.

In DOS, the parallel printers could be accessed directly on the command line. For example, the command TYPE C: AUTOEXEC.BAT LPT1: would redirect the contents of the AUTOEXEC.BAT file to the printer port. A PRN device was also available as an alias for LPT1. Some operating systems like Multiuser DOS allow to change this fixed assignment by different means. Some DOS versions use resident driver extensions provided by MODE, or users can change the mapping internally via a CONFIG.SYS PRN n directive as under DR-DOS 7.02 and higher. DR-DOS 7.02 also provides optional built-in support for LPT4 if the underlying BIOS supports it.

PRN, along with CON, AUX and a few others are invalid file and directory names in DOS and Windows, even in Windows XP. There is even an MS-DOS device in path name vulnerability in Windows 95 and 98, which causes the computer to crash if the user types C: CON CON, C: PRN PRN or C: AUX AUX in the Windows Explorer address bar. citation needed Microsoft has released a patch to fix this bug, but newly installed Windows 95 and 98 operating systems will still have the bug.

A special PRINT command also existed to achieve the same effect. Microsoft Windows still refers to the ports in this manner in many cases, though this is often fairly hidden.

In SCO UNIX and Linux, the first parallel port is available via the filesystem as /dev/lp0. Linux IDE devices can use a paride parallel port IDE driver. 7

Notable Consumer Products edit

The Snappy video capture device

MS-DOS 6.22 s INTERLNK and INTERSRV drive sharing utility

The Covox Speech Thing audio device

For consumers, the USB interface and sometimes Ethernet has replaced the parallel printer port, for connections both to printers and to other devices.

Many manufacturers of personal computers and laptops consider parallel to be a legacy port and no longer include the parallel interface. Smaller machines have less room for large parallel port connectors. USB-to-parallel adapters are available that can make parallel-only printers work with USB-only systems. There are PCI and PCI-express cards that provide parallel ports. There are also some print servers that provide interface to parallel port through network. USB-to-EPP chips can also allow other non-printer device to continue to work on modern computers without a parallel port. 8

For electronics hobbyists the parallel port is still often the easiest way to connect to an external circuit board. It is faster than the other common legacy port serial port and requires no serial-to-parallel converter, and requires far less interface logic and software than a USB target interface. However, Microsoft operating systems later than Windows 95/98 prevent user programs from directly writing to or reading from the LPT without additional software kernel extensions. 9 Current CNC Milling Machines also often make use of the parallel port to directly control the machine s motors and attachments.

Traditionally IBM PC systems have allocated their first three parallel ports according to the configuration in the table below if all three printer ports exist.

If there is an unused slot, the port addresses of the others are moved up. For example, if a port at 0x3BC does not exist, the port at 0x378 will then become the first logical parallel port. 10 The base address 0x3BC is typically supported by printer ports on MDA and Hercules display adapters, whereas printer ports provided by the mainboard chipset or add-on cards rarely allow to be configured to this base address. Therefore, in absence of a monochrome display adapter, a common assignment for the first logical parallel port and therefore also for the corresponding LPT1 DOS device driver today is 0x378, even though the default is still 0x3BC and would be selected by the BIOS if it detects a printer port at this address. The IRQ lines are typically configurable in the hardware as well. Assigning the same interrupt to more than one printer port should be avoided and will typically cause one of the corresponding ports to work in polled mode only. The port addresses assigned to slot can be determined by reading the BIOS Data Area BDA at 0000h:0408h.

Bit to pin mapping for the Standard Parallel Port SPP :

indicates a hardware inversion of the bit.

In versions of Windows that did not use the Windows NT kernel as well as DOS and some other operating systems, programs could access the parallel port with simple outportb and inportb subroutine commands. In operating systems such as Windows NT and Unix NetBSD, FreeBSD, Solaris, 386BSD, etc., the microprocessor is operated in a different security ring, and access to the parallel port is inhibited, unless using the required driver. This improves security and arbitration of device contention. On Linux, inb and outb can be used when a process is run as root and an ioperm command is used to allow access to its base address; alternatively, ppdev allows shared access and can be used from userspace if the appropriate permissions are set.

The cross-platform library for parallel port access, libieee1284, also is available on many Linux distributions and provides an abstract interface to the parallel ports of the system. Access is handled in an open-claim-release-close sequence, which allows for concurrent access in userspace.

The older parallel printer ports had an 8-bit data bus and four pins for control output Strobe, Linefeed, Initialize, and Select In, and five more for control input ACK, Busy, Select, Error, and Paper Out. Its data transfer speed is at 150 kbit/s. 1

The newer EPPs Enhanced Parallel Ports have an 8-bit data bus, and the same control pins as the normal parallel printer port. Newer ports reach speeds of up to 2 MB/s. 11

Pinouts for parallel port connectors are:

Pinouts for parallel port connectors.

Inverted lines are true on logic low. If they are not inverted, then logic high is true.

Pin 25 on the DB25 connector might not be connected to ground on modern computers. dubious – discuss

Except for the very first revision of the parallel port adapter in the original IBM PC, the data lines in early parallel ports were unidirectional data out only, so it was not easily possible to feed data into the computer. However, a workaround was possible by using 4 of the 5 status lines. A circuit could be constructed to split each 8-bit byte into two 4-bit nibbles which were fed in sequentially through the status lines. Each pair of nibbles was then re-combined into an 8-bit byte. This same method with the splitting and recombining done in software was also used to transfer data between PCs using a laplink cable.

IEEE 1284 which is sometimes called an Enhanced Parallel Port

Biostar, a Taiwanese computer component manufacturer partly known for having parallel port connectivity on their motherboards

For host computer, see Super I/O

For peripheral side, parallel port interface chips: PPC34C60 SMSC and W91284PIC Warp Nine

For USB-printer purpose, example USB chips: PL-2305 Prolific and CH341 QinHeng

a b James, Kevin. PC interfacing and data acquisition : techniques for measurement, instrumentation and control. Oxford ; Boston : Newnes, 2000. ISBN 9780750646246. p. 256

Webster, Edward C. 2000. Print Unchained: Fifty Years of Digital Printing: A Saga of Invention and Enterprise. West Dover, VT: DRA of Vermont. ISBN 0-9702617-0-5.

Dataproducts D-Sub 50 Parallel. Hardware Book. Retrieved 2008-01-25.

Dataproducts M/50 Parallel. Hardware Book. Retrieved 2008-01-25.

Durda IV, Frank 2004. Centronics and IBM Compatible Parallel Printer Interface Pin Assignment Reference. Retrieved 2007-10-05.

Mitskaniouk, Oleg 2000-06-19. The D-Link DMP-100 MP3 Player. Target PC Magazine. p. 2. Retrieved 2012-07-20.

Barkakati, Naba 2006. Linux All-in-One Desk Reference For Dummies. For dummies 2 ed.. John Wiley Sons. p. 482. ISBN 9780471793137. Retrieved 2015-09-11. Some IDE devices use a parallel port IDE adapter that s what the PARIDE option refers to.

Parallel port flatbed scanner works under USB on Win9x Archive. Retrieved 2012-06-30.

a b c d Frank Van Gilluwe, The Undocumented PC, 1994, page 703, ISBN 0-201-62277-7

Parallel Port Definition, Techopedia

Axelson, Jan 2000. Parallel Port Complete. Lakeview Research. ISBN 0-9650819-1-5.

The Linux Parallel Port Subsystem by Tim Waugh

Wikimedia Commons has media related to Parallel port.

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Retrieved from https://en.wikipedia.org/w/index.php.title Parallel_port oldid 686376649

Categories: Computer busesPhysical layer protocolsLegacy hardwareComputer connectors.

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