PORTS Forum

Ports and Interfaces => Serial Ports => Topic started by: GlennP on February 17, 2015, 06:03:19 am

Title: Max232 Issues....
Post by: GlennP on February 17, 2015, 06:03:19 am

Hi All,
I am having to interface some boards that use TTL levels to RS232 level on a PC.  I have wired up a MAX232 chips to which I can give RS232 inputs and get TTL out (pins 8 & 9 with 12 & 13) this gives me a nice TTL level.  Can this TTL voltage be put into TTL inputs also on the chip to generate an RS232 output?  I tried this  as  I have reason to belive the IrDA boards are the source if trouble so I wanted to ensure my circuit was working.
Thanks Glenn 

Title: Re: Max232 Issues....
Post by: Jan Axelson on February 17, 2015, 09:10:30 am

Yes, sure.

Title: Re: Max232 Issues....
Post by: GlennP on February 17, 2015, 09:18:45 am

Ahh! Dang, it appears as though I can send data via the Max but not read the TTL-> RS232 something isn't working!!!!

Title: Re: Max232 Issues....
Post by: Jan Axelson on February 17, 2015, 12:16:57 pm

Don't forget that most of the converter chips also invert.