Printers And Scanners Interface And
4.Printer and Scanner Interfaces
A printer's interface is a combination of hardware and
software that allows the printer to communicate with a computer.
The hardware interface is called port and each printer
has atleast one interface. An interface incorporates several
components including its communication type as well as the
There are eight major communication types
1. Serial : Computers send one bit at a time,
one after another through serial connection. The communication
parameters like parity, baud should be set on both entities
before communication takes place.
2. Parallel : Parallel communication is more popular
with printers because it is more faster than serial communication.
In this type of communication, printer receives eight bits
at a time over eight separate wires.
Parallel uses a DB25 connection on the computer side
and a oddly shaped 36 pin connection on the printer.
3. USB (Universal Serial Bus) : These can transfer
data quickly with a transfer rate up to 12 Mbps and it automatically
recognizes new devices.
4. Network : Network, or commonly Ethernet, connections
are commonplace on network laser printers, though some other
types of printers do employ this type of connection. These
printers have a Network Interface Card (NIC) and ROM-based
software that allows them to communicate with networks,
servers and workstations.
5. Infrared : Infrared transmissions are wireless
transmissions that use radiation in the infrared range of
the electromagnetic spectrum. An Infrared acceptor allows
your devices (laptops, PDA's, Cameras, etc) connect to the
printer and send print commands via infrared signals.