RS 232 Interfacing with PIC - Electronic Circuits Projects Diagrams Free

dreamproject · 11th May 2006, 07:01 PM

hi all,

For a project that I am on to , I require that RTS (Request to Send) and DTR ( Data terminal Ready ) be set to "ON" , for a certain device (Mobile phone) to work when connected to a PIC. Does this mean I hook it up to +15 volts or is there a more sinster meaning to this.

Thanks

Papabravo · 11th May 2006, 07:35 PM

What could possibly be sinister about hooking up a pair of signals? Rather than hooking directly to a supply I would use a buffer with its input pulled up or down as appropriate so that your outputs, even though constant, behave like RS-232 signals instead of like power supplies.

philba · 11th May 2006, 07:50 PM

I'd use a max232 or clone. It happens to have 4 drivers on it so you can use 2 for the data and the other 2 for RTS nd DTR. pretty standard application. read the rather massive max232 data sheet from maximic.com

Papabravo · 11th May 2006, 08:44 PM

That's

www.maxim-ic.com

philba · 11th May 2006, 10:35 PM

funny, www.maximic.com works also but does redirect to the dash name...

Papabravo · 12th May 2006, 12:04 AM

Somebody cybersquatted on the maxim.com domian name before maxim did and they must have been uninterested in moving.

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11th May 2006, 07:01 PM	(permalink)
dreamproject	RS 232 Interfacing with PIC hi all, For a project that I am on to , I require that RTS (Request to Send) and DTR ( Data terminal Ready ) be set to "ON" , for a certain device (Mobile phone) to work when connected to a PIC. Does this mean I hook it up to +15 volts or is there a more sinster meaning to this. Thanks __________________ the best bet yet...

11th May 2006, 07:35 PM	(permalink)
Papabravo	What could possibly be sinister about hooking up a pair of signals? Rather than hooking directly to a supply I would use a buffer with its input pulled up or down as appropriate so that your outputs, even though constant, behave like RS-232 signals instead of like power supplies. Last edited by Papabravo; 11th May 2006 at 07:38 PM.

11th May 2006, 07:50 PM	(permalink)
philba	I'd use a max232 or clone. It happens to have 4 drivers on it so you can use 2 for the data and the other 2 for RTS nd DTR. pretty standard application. read the rather massive max232 data sheet from maximic.com Last edited by philba; 11th May 2006 at 10:36 PM.

11th May 2006, 08:44 PM	(permalink)
Papabravo	That's www.maxim-ic.com

11th May 2006, 10:35 PM	(permalink)
philba	funny, www.maximic.com works also but does redirect to the dash name...

12th May 2006, 12:04 AM	(permalink)
Papabravo	Somebody cybersquatted on the maxim.com domian name before maxim did and they must have been uninterested in moving. Last edited by Papabravo; 12th May 2006 at 12:10 AM.