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

Answer Posted / calvin

RS232 -
-- point to point
-- Distance 20m
-- Both Half duplex & full duplex
[half duplex --> Data can only be sent or received at
a time and not both same time]
[Full duplex --> data can be sent or received at the same
-- An unbalanced signal --> represented by a single signal
wire where a voltage level on that one wire is used to
transmit/receive binary 1 and 0
-- min input level +/-3V
-- Very sensitive to noise

-- Multipoint
-- distance upto 1200m @ 100Kbps
-- only half duplex
-- min input level 200mV
-- less sensitive to noise

Is This Answer Correct ?    15 Yes 5 No

Post New Answer       View All Answers

Please Help Members By Posting Answers For Below Questions

I have installed a RTD whose length is 2250mm(RTD stem length), but it's upper 200 -250mm is out of the reactor, and this upper 200mm stem is surrounded by atmospheric temp. And the lower portion i.e. 2000mm is in contact with the measuring fluid, then does the final measuring temp. Gonna change as the upper 200mm RTD stem is out of reactor?


what is the minimum power (P=VI)to produce a spark?


How to calibrate Field bus transmitter? procedure ?


How can test or measure the probe and extension cable to identify if the problem at the probe or cable or at the driver it self? (pleast notify the measuring method)


pls suggest suitable MOC of diaphragm for pressure measurement of UREA grade solution service fluid.


what is orfics working in main steam line. is it increase pressure, velocity of steam flow and dicrease steam flow rate. or any other


Derive capacitance to 4-20ma conversion formula / relation in capacitance type pressure sensor?


send me last 5 years questions asked in rrb chennai, for section engineer


Can Any body tell me about the Contact or Email id of any good Consultancy which help me to find a job in Instrumentation Field in India .I have Six years of Work Experience in the Same field.Please revert me back on shammi_gwalior@yahoo.com ?


how many type conductivity sensor ?


Please can anybody help for control valve sizing step by step procedure?


can anyone tell me about the basic concepts to consider before to start a PLC panel wiring


i want to know the interview format fot gail, instrumentation. pls answer me in habib.sami1003@gmail.com


What is upsampling and downsampling?


line up procedure for dp type flow transmitter?