IEEE1284-C
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IEEE1284-C

pinout

 36 pin MDR36 female
36 pin MDR36 female connector  at the computer??
PinSignalAbbr.Source
1Busy (high)BUSYPrinter
2Select (active high)SELPrinter
3Acknowledge (active low)ACKPrinter
4Error (Fault- active low)ERRORPrinter
5Paper Error (active highPEPrinter
6Data Bit 0 (LSB)D0Computer
7Data Bit 1D1Computer/Printer
8Data Bit 2D2Computer/Printer
9Data Bit 3D3Computer/Printer
10Data Bit 4D4Computer/Printer
11Data Bit 5D5Computer/Printer
12Data Bit 6D6Computer/Printer
13Data Bit 7 (MSB)D7Computer/Printer
14InitialINIT 
15Data Strobe (low)STROBEComputer
16Select Input (active low)SI 
17Auto Line Feed (active low)ALF 
18Host Logic HighHLHComputer
19Return/GroundRGND 
20Return/GroundRGND 
21Return/GroundRGND 
22Return/GroundRGND 
23Return/GroundRGND 
24Return/GroundRGND 
25Return/GroundRGND 
26Return/GroundRGND 
27Return/GroundRGND 
28Return/GroundRGND 
29Return/GroundRGND 
30Return/GroundRGND 
31Return/GroundRGND 
32Return/GroundRGND 
33Return/GroundRGND 
34Return/GroundRGND 
35Return/GroundRGND 
36Peripheral Logic HighPLHPrinter

IEEE-1284 (officially known as 1284-1994, Standard Signaling Method for a Bidirectional Parallel Peripheral Interface for PCs) refers to a standard set by the Institute of Electrical and Electronic Engineers. It specifies, among other things, five modes of data transfer: standard (legacy style), reverse (nibble and byte modes), and half-duplex or bidirectional (EPP and ECP). It also details cable properties and connector types. The 1284 standard is an innovation that allows parallel printer ports to transfer data at many times the standard speed, and also allows for an array of bidirectional communications and longer cable runs. The Enhanced Parallel Port (EPP) and Extended Capabilities Port (ECP) both follow 1284 standards, although EPP was developed prior to 1284"s release. The primary advantage of this technology is the ability to use devices on a PC"s parallel port that were previously unable to be used because of communication limitations. However, printers have also benefited and Hewlett-Packard"s Bitronix protocol, introduced with their LasetJet 4, is proof. Bitronix takes advantage of 1284"s nibble mode, and allows data to be sent from the printer to the computer quickly in this manner.

What is the difference between an IEEE-1284 cable and a standard one?
This is often a misunderstood concept. First, let"s make the distinction between bidirectional and 1284-compliant cables. Applying the 1284 standard to cables, the IEEE-compliance primarily means speed, and these cables are precisely manufactured for that purpose. The 1284 standard sets exacting specifications on cable impedance, shielding, length, and connector styles to insure that they will be up to the task. Bidirectional cables must simply be able to transfer data in both directions, and your everyday 25-wire printer cables (and all straight-thru 25 wire cables) are capable of this; they are not, however, capable of the speed required by 1284-compliant peripherals. Peripherals which are IEEE-1284 compliant (such as many newer printers) require the use of a high-speed cable, as do most of the devices that connect to an EPP or ECP.

Describe the connectors that are used on these cables.
There are three official types of connectors: they are termed "A," "B," and "C." The "A" type is a standard DB25 and the "B" type is your typical Centronics 36 connector. The "C" type is exclusive to 1284, and is intended to be used on new equipment which conforms to the standard; it is called a half-pitch Centronics 36 connector (HPCN36).

What devices require IEEE-1284 cables?
As a rule of thumb, any device that requires your computer"s parallel port to be set to EPP/ECP mode is worthy of a 1284-compliant cable. Specifically, most newer printers, backup devices, scanners, and the like require these cables. In addition, any parallel device with an HPCN36 connector requires a 1284 cable. If in question, refer to the user"s manual of that specific device.

Can I use a non-1284 compliant cable instead of one that is?
It is possible, but not recommended. Results can range from limited success to complete lack of operation.

What are the length restrictions on cables? Do I need to terminate the end of the chain?
In order to maintain peak performance, the total distance from computer to the last device should be no more than about 35 feet. Longer runs may be utilized with a possible drop in overall performance. No external termination is required; peripherals already come with the necessary termination. At PC Cables and Parts, you"ll discover an easy to use, information packed web site. Click here to learn more about Printer Cables.

Note: Direction is Computer relative Device.

36 pin MDR36 male
36 pin MDR36 male connector  at the device??

Source:www.pinouts.ru


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