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PROJECT BASICS
POWER SUPPLY
RELAY
CURRENT BUFFER
BIDIRECTIONAL CURRENT BUFFER
PARALLEL PORT
INTODUCTION & PIN OUT
ACCESSING PARALLEL PORT in MATLAB
LEVEL SHIFTER
WIRELESS COMMUNICATION
PROJECT IDEAS
 

 

 

Parallel Port: -

Computers parallel port is generally used to send or receive binary signals while interfacing with the external devices.

We can use switches, micro-controller pins or some IC pins to connect to parallel port.

Pin-out of Parallel port: The parallel port consists of 8 data pins and 4 status pins .We can use data pins as output ports and status as input port.

The data and status pins are normally high. Data pins are latched outputs while status pins are always high, except when a low input is applied and retained.

Pin No (DB25)

Signal name

Direction

Register - bit

1

nStrobe

Out

Control-0

2

Data0

In/Out

Data-0

3

Data1

In/Out

Data-1

4

Data2

In/Out

Data-2

5

Data3

In/Out

Data-3

6

Data4

In/Out

Data-4

7

Data5

In/Out

Data-5

8

Data6

In/Out

Data-6

9

Data7

In/Out

Data-7

10

nAck

In

Status-6

11

Busy

In

Status-7

12

Paper-Out

In

Status-5

13

Select

In

Status-4

14

Linefeed

Out

Control-1

15

nError

In

Status-3

16

nInitialize

Out

Control-2

17

nSelect-Printer

Out

Control-3

18-25

Ground

-

-

 

 

 

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