What is RS 232 and where is it used?

[bhq]

What is RS 232. Please let me know that what is RS 232, where it is used

 

[House_Cat]

Re: What is RS 232 ??

RS stands for "Recommended Standard". RS 232 is the recommended standard for serial communication between digital devices. There are many definitions and explanations on the web if you do a Google search for "RS 232". One of them can be found at : https://www.omega.com/TechRef/pdf/RS-232.pdf

 

[bhq]

Re: What is RS 232 ??

Thanks for the reply, could you please let me know that what is the basic defination, when we communicate a cpu with a microcontroller or a mobile. In this case what this definication says and what standard it shows

 

[Awarapunshee]

Re: What is RS 232 ??

Thanks for the reply, could you please let me know that what is the basic defination, when we communicate a cpu with a microcontroller or a mobile. In this case what this definication says and what standard it shows

When data is transfered by RS232 standard, the first bit is start bit and there are 8 bits of data (one by one) and then there is a stop bit.

The data itself in sent using standard asuncronous RS-232C serial format:
Start D0 D1 D2 D3 D4 D5 D6 D7 Stop

you can find more on web easily

 

[Faizan Jawaid]

Re: What is RS 232 ??

RS-232 is basically a voltage level of transmitting digital data...In RS-232 High means (-12V) and Low means (+12V), so it has an output span of +/-12V

 

[House_Cat]

Re: What is RS 232 ??

RS-232 is basically a voltage level of transmitting digital data...In RS-232 High means (-12V) and Low means (+12V), so it has an output span of +/-12V

That's not correct. There are, in fact, RS 232 tranceivers that operate on 5VDC power supplies. The voltage specification in the IEA RS 232 standard is very loose.

RS-232 Specifications
TRANSMITTED SIGNAL
VOLTAGE LEVELS:
Binary 0: +5 to +15 Vdc
(called a “space” or “on”)
Binary 1: -5 to -15 Vdc
(called a “mark” or “off”)

RECEIVED SIGNAL
VOLTAGE LEVELS:
Binary 0: +3 to +13 Vdc
Binary 1: -3 to -13 Vdc

DATA FORMAT:
Start bit: Binary 0
Data: 5, 6, 7 or 8 bits
Parity: Odd, even, mark or space
(not used with 8-bit data)
Stop bit: Binary 1, one or two bits