LI2Y(St)CY PIMF (RS 232 - RS 422)

• Instrumentation and Control Engineering
  
• Industrial Electronics
  
• Computers and Office Machines

NOTES

• RS-232: it is a well-known interface standard. It is designed for serial data exchange
  between two devices. Data can be transmitted 15 ~ 31 meters by a suitable cable.
  It allows data transmission up to 20Kbps
  RS 422: It is as a two serial communication standard and more correctly named
  as EIA/TIA-422. Communication systems based on RS-422 communicate digital
  information over twisted pair wire from transmitters to receivers. Devices can be
  apart from each other up to 1220 meter without any repeaters and RS 422 drivers
  can tranmit to up to 10 receivers (1 driver 10 receivers) and RS 422 systems can
  communicate at rate from 100Kbps (at 1200 m) up to 10Mbps (at 12 m) varing by
  cable length. This systems utilize balanced outputs and differential inputs. As a
  result, they provide better noise immunity than single-ended systems such as
  RS 232. Thus links using RS 422 operate over longer distance at higher speed than
  links using RS 232. RS 422 also makes it possible to create point-to-multipoint
  connections but RS-485 devices are required for master to receive data back from
  each slave.