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PostPosted: Thu Oct 04, 2018 7:15 am 

Joined: Tue Feb 20, 2018 8:28 pm
Posts: 2
i am new in plc programming . i know the basics difference between the rs232, rs422, rs485. but i am little bit confused in it. so i have the following question regarding these terms.

1. can these protocols communicate with each other i mean rs232 can communicate with rs422 or rs485 and same.

2. my plc has port rs422 but i can connect it with my laptop serial port which is rs232 ?

3. what are the main important points that kept in mind during communication or cross communications.



any help will be greatly appreciated.


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PostPosted: Thu Oct 04, 2018 1:41 pm 

Joined: Thu Aug 29, 2013 7:11 pm
Posts: 73
zubair136 wrote:
i am new in plc programming . i know the basics difference between the rs232, rs422, rs485. but i am little bit confused in it. so i have the following question regarding these terms.

1. can these protocols communicate with each other i mean rs232 can communicate with rs422 or rs485 and same.

2. my plc has port rs422 but i can connect it with my laptop serial port which is rs232 ?

3. what are the main important points that kept in mind during communication or cross communications.



any help will be greatly appreciated.


RS232, RS485, RS422 is not a protocol - it's a physical layer.

https://en.wikipedia.org/wiki/RS-485
https://en.wikipedia.org/wiki/RS-232
https://en.wikipedia.org/wiki/RS-422


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