Just a stupid suggestion:  You have diodes to turn the MAX232 ON (or
OFF), but do you have a resistor to drag the MAX232 input the other way
when neither diode is conducting?  Something like 1K for starters.

Sherpa Doug

> -----Original Message-----
> From: Keith Christopher [mailto:keithc_21211@YAHOO.COM]
> Sent: Thursday, January 24, 2002 3:47 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [EE] Little 232 help
>
>
> I have a 2 logic gates going to the rx pin (ttl) on a
> max 232 chip. I have put 1n4148 diodes between the
> logic outs (only one gate open at a time), and I
> receive no output on the PC connected to the 232 side
> of the max232. If I remove the diodes and hook both
> gate outputs to the pin (pin 10) I get nothing also.
> If I hook them up one at a time All is well. Not sure
> why the diodes are not working as I figure they would.
> I have checked the voltages and one is at 4.94v the
> other is 33mV, without the diodes.
>
>
> Keith
>
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