Author Topic: Max232 Issues....  (Read 2392 times)

GlennP

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Max232 Issues....
« 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 

Jan Axelson

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Re: Max232 Issues....
« Reply #1 on: February 17, 2015, 09:10:30 am »
Yes, sure.

GlennP

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Re: Max232 Issues....
« Reply #2 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!!!!

Jan Axelson

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Re: Max232 Issues....
« Reply #3 on: February 17, 2015, 12:16:57 pm »
Don't forget that most of the converter chips also invert.