IEEE1284-B to IEEE1284-C Adaptor Pin-Out

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.

**IEEE 1284-C to 1284-B Adapter PinOut**
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 The IEEE1284 cable replaced the 'Centronics' cable, which is obsolete.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.

Centronics Connector Pinout .. Parallel Port Connector Pinout .. 1284-A Cable Pinout .. 1284-B Cable Pinout .. 1284-C Cable Pinout
{This Web Site}

Back to the main IEEE-1284 bus page. {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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