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RS232 is for point to point communication where as RS 485 is for multidpoint communication, Voltage level and speed differ

Hi frnds,,

There are few points which v can discuss on these are

1) Ya first main important point is RS232 is point to point communication n RS485 is multidrope communication which means ...

on RS232 u can not connect more than two device...

RS485 u can connect upto I think max 128 device theorically..(its depends on noise level as well as on distance and burd rate also)

Practicall as max 32...

2)Voltage level of RS232 is

-3 to -25 for 1

+3 to +25V for 0

while RS485 is based on differential voltage (0-5v) diff is 240mV for 1 and -240mV for 0.

3)distance limitation is 100meter for RS232 and 1Km for RS485,

4)noise immunity is high for RS485 as it is balance protocol and differencial protocol..

5)Software point of view u need to set transmit enable line in RS485 rest of the software is same...

6)pin for 232 is (Rx Tx and GND) while in case of RS485 it is (A(+) and B(-)) no need to transmit GND..signal

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