how to read the signals from rs 232 port

aathisankar148 · 09-12-2008, 01:15 AM

Hi friends i am new this forum.I found this forum helping in clearing the doubts of many.I need a help from you friends.I am working on one project.As a part of the project i have to catch the sigals that are sent from the rs232 port like the (signals from UPS,etc)via c- program.so i need your help in doing that.Please help me out in this.Thank you.

ciphyre · 09-13-2008, 09:56 AM

Quote:

Originally Posted by aathisankar148

Hi friends i am new this forum.I found this forum helping in clearing the doubts of many.I need a help from you friends.I am working on one project.As a part of the project i have to catch the sigals that are sent from the rs232 port like the (signals from UPS,etc)via c- program.so i need your help in doing that.Please help me out in this.Thank you.

A good starting point should be looking up the RS232 standard:

http://www.camiresearch.com/Data_Com..._standard.html
http://en.wikipedia.org/wiki/RS-232

Hope that helps.

aathisankar148 · 09-16-2008, 09:27 AM

Hi ciphyre..
i thank you very much for the links the links that you gave.I also searched the wikipedia about this and got idea about the rs232 port and connection.could you sugget any sample c porgram (or in any other language) to read the siganls from the rs232 serial port.

apnicservices · 09-16-2008, 11:19 AM

Quote:

Originally Posted by aathisankar148

Hi ciphyre..
i thank you very much for the links the links that you gave.I also searched the wikipedia about this and got idea about the rs232 port and connection.could you sugget any sample c porgram (or in any other language) to read the siganls from the rs232 serial port.

Have you used 'minicom'? Use minicom to communicate with your serial port (/dev/ttySx). Once this works for you, you can GOOGLE for a sample C program of which there are many, to work with your serial port :-)

http://www.beyondlogic.org/serial/serial1.htm
http://electrosofts.com/serial/

jf.argentino · 09-16-2008, 11:29 AM

Take a look there:
http://tldp.org/HOWTO/Serial-Programming-HOWTO/

aathisankar148 · 09-19-2008, 12:44 AM

Hi friends ,
i thank you very much for the links. i am new to minicom and i didnt used that . Could you tell me what is that ...
thank you ..

resetreset · 09-19-2008, 02:40 AM

minicom is a terminal program, one that you use to communicate with your modem (to dial into BBSes in the old days, for example), if you have one.