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

Answer Posted / shahul

RS232
It is limited Distance and the speed is Maximum up to
19.2KBPS for 50 Feet.
only single ended.Only 1 transmitter/1 receiver
Supports only Full Duplex.
Signal level is unbalanced.
Higher output current 500mA
RS485
Multi drop topology and supports both half duplex and full
duplex.Maximum 32 Transmitters and 32 receivers.
Max.Distance up to 4000 feet with 100KPBS
Signal Level is Balanced.
Less output current.

Is This Answer Correct ?    14 Yes 6 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

explain key exchanges in all security modes WPA,WPA2,TLS?

1497


what are the documents(Construction point of view for a process plant) submitted by contactor initially entering in to new site for client?

1758


which type of zones used for boiler? & why ?

1428


, Instrument Index, P&ID review, I/O schedule, datasheet, DCS / Analyzers specifications, loop diagrams, hook-up drawings.

7561


How to check vortex flow meter is in good condition while we do not having calibration setup?

7515






Explain the working principle of lvdt?

699


i hav applied for the post of engg. in iocl so please require the past test papers fro instrumentation engg please please help me and send me the papers or tell me the pattern and type of ques asked in examination......

1571


What is megering????

13914


how to calibrate corollaries (Mass flow meter)?

1645


1. what is modbus cable? 2. what kind of communication we are using for the interface of DCS, ESD and Third party cabinets? 3. What is serial communication and peer to peer communication?

1675


how can i check vortex shedder bar it is ok? if there is ohms condition are shown correct?

1713


what is the difference between attemperator and desuperheater ?

4985


What is the meaning of wet leg

675


Tell about your IFFCO plant visit.

1644


Explain why plc require in analog input 4-20amp & 0-10 volt?

622