Q:

What is the difference between RS232 and RS485?

YasminRadwan26

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2022-06-23

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What is the difference between RS232 and RS485?

C programming, Interview questions, C programming Interview-questions,

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YasminRadwan26

2022-06-23

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Answer:

The RS232 and RS485 is an old serial interface. Both serial interfaces are the standard for data communication. This question is also very important and generally ask by an interviewer.

Some important difference between the RS232 and RS485

Parameter	RS232	RS485
Line configuration	Single –ended	differential
Numbers of devices	1 transmitter 1 receiver	32 transmitters 32 receivers
Mode of operation	Simplex or full duplex	Simplex or half duplex
Maximum cable length	50 feet	4000 feet
Maximum data rate	20 Kbits/s	10 Mbits/s
signaling	unbalanced	balanced
Typical logic levels	+-5 ~ +-15V	+-1.5 ~ +-6V
Minimum receiver input impedance	3 ~ 7 K-ohm	12 K-ohm
Receiver sensitivity	+-3V	+-200mV

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