what is the difference between RS 232,RS 485,RS 422, how
they different from each other

Answer Posted / jigar bhatt

*RS422 devices also operate Full Duplex.
*transmit&receive signal lines separate for bi-direction comm.

*RS485 operates in a half duplex manner.
*Devices operate as transceivers, but not simultaneous.

*RS232 is unbalanced(i.e Single wire is used to
transmit/receive binary 1 and 0) while RS485 is balanced(i.e
voltage difference is used to transmit/receive binary

Officially the RS485 specification allows only 32 nodes
(devices) on the circuit. However, IC
manufacturers have developed RS485 drivers capable of
allowing 128 to 255 nodes on an
RS485 LAN. This means that you can use our Converters and
Remote I/O devices in more
expansive situations.

Is This Answer Correct ?    1 Yes 0 No

Post New Answer       View All Answers

Please Help Members By Posting Answers For Below Questions

Calibration procedure for electro magnetic flow meter


1.what is the effect of vapour presuure in orifice plate flow measurement 2.which is more effective 2 pressure sensors or one single differential pressure sensor in orifice plate measurement 3.how to design a v/i converter and i/v converter 4.how many type of thermocouple are there 5.how many leads are there in thermocouple measurement 6.how pressure sensors are connected in level measurement in differential pressure method 7.what is the output of capacitive pressure sensor (ac or dc),how its o/p is signal charactarized 8.what is the physical meaning of discharge coeeficient,why it is calculated,orifice plate what is its value,why it is less than 1,Q at upstream is equal to or not equal to Q at downstream of orifice plate why?what is vena contracta in orifice plate 9.why rotameter is called variable area flowmeter,it can measure flow even if area is not varying,why it is made tapered 10.design a 10 bit counter ,which counter you will prefer 11.how to remove self heating error in RTD 12.which is more sensitive pt100 or pt50 13.why thermocouple are connected in parallel 14.what is lead contact error in RTD,how to avoid 15.what is P,PI,PID,PD controller,why there is no ID controller 16.what is override,split range,sequential,ratio,feedforward,cascade controller 17.why we moved from SR to JK and then JK to master slave JK flipflop,give correct reason 18.how to measure level of a closed container which contains vapour and liquid,remember no vapour gas should be leaked,so ultrasonic and capacitive is not an option,design another method 19.how to design horse race counter including sensors and signal conditioning element 20.what is bevelling


Difference between ultra sonic flow meter


i have used level transmitter in starch cooking preparation tank. tank total height 2mtr.sometime LT display shows some error value when tank is fully empty and diaphragm side i already checked okay no problem in diaphragm area. field cable checked 24volt and mA shows correct value while tank empty mA is 4mA. 4mA i needed that 0% but display showing 10% or 15% percentage values are varying continously please give any good solution for me.....


send me HPCL paper


sir i m preparing for BARC but i am not getting any papers to prepare for this exam so please send me some sample papers to my i.d for the preparation of barc.


What is zero elevation and zero suppression?


what is the PC interface and software for connection to ABB logic module “ LM011-CE18RAC “ ( for Programming ) ??


what will the sending unit in the fuel gauge utilizes?


why direct mounted pressure transmitters is always installed with DBB ( double bleed block) valve in process line or top of the tanks ?


Im having problems with interfase betwen SPI v7.0 and SPPID v5.05. Previous versions of Intools shoul be fixed with SPPIDproj.ocx file. It was necessary to replace this file with one that allows the connection between different versions of SPPID. It is necessary in the current version to do the same?Thanks


please send the drdo exam paper


How many interlocks at turbine side?


Reason for capillary type dp level transmitter fluctuation


sir, i preparing hpcl,ongc,barc,hal exams(instrumentation engg)pls send a placement papers