Call us now toll free: 1 (888) 688-2188

My Cart:

0 item(s) - $0.00
You have no items in your shopping cart.

0

1 Port RS422 & RS485

RS232 differences with RS422/RS485

There is a difference between RS232 and RS422/485 serial adapters. Both RS-232 and RS-422 send bit by bit signals but the wiring specifications are different in that RS-422 uses twisted pair wiring reducing noise levels. While signal is sent through both wires during communication it's the voltage-difference between them that is the indicator of the signal value. The table below shows the differences between the three types of serial signals

Specifications difference between RS232, RS422, RS485
 RS-232 RS-422 RS-485
Differential   no  yes   yes
Maximum Number of Drivers
Maximum Number of Receivers
  1 driver
  1 receiver
  1 driver
  10 receivers
  32 drivers
  32 receivers
Modes of Operation   half duplex
  full duplex
  half duplex
  (Differential)
  half duplex
  (Differential)
Network Topology   point-to-point   multi-drop   multi-point
Maximum Distance (cable length)   15 m (50 ft.)   1200 m (4000 ft.)   1200 m (4000 ft.)
Maximum speed at 12 m
Maximum speed at 1200 m
  20 kbs
  (1 kbs)
  10 Mbs
  100 kbs
  35 Mbs
  100 kbs
Maximum Slew Rate   30 V/μs   n/a   n/a
Receiver Input Resistance   3 to 7 kΩ   ≧ 4 kΩ Min.   ≧ 12 kΩ
Driver Load Impedance   3 to7 kΩ   100 Ω   54 Ω
Receiver Input Sensitivity   ±3 V   ±200 mV   ±200 mV
Receiver Input Range   ±15 V   ±10 V   –7 to 12 V
Maximum Driver Output Voltage   ±25 V   ±6 V   –7 to 12 V
Minimum Driver Output Voltage
(with load)
  ±5 V   ±2.0 V   ±1.5 V

8 Item(s)

Grid  List 

8 Item(s)

Grid  List