[time-nuts] TTL to RS-232

Joseph Gray jgray at zianet.com
Tue Feb 13 20:31:07 EST 2007

Great tip. Thanks for sharing. You're lucky to have a decent surplus place 
locally. If I were to walk into the only so-called surplus place we have and 
asked for a MAX232 chip, I'd get blank stares. If it's not 50 years old, or 
a new clone PC component, he won't have it or know what it is.

----- Original Message ----- 
From: <N3IZN at aol.com>
To: <time-nuts at febo.com>
Sent: Tuesday, February 13, 2007 6:22 PM
Subject: [time-nuts] TTL to RS-232

> Thought I would pass this on.
> I was working on one of those GPS disciplined oscillators kits out  there 
> and
> it didn't have provisions to read the NEMA data to see if it was  locked 
> or
> not. So I was at the local electronics surplus parts store (AKA  junk 
> place)
> and started looking for MAX232 chips and he directed me to a section 
> where they
> had cell phone accessory cables.
> This cable had a DB 9 on one side and the other plugged in to the cell
> phone. From his suggestion, I cut off the cell phone plug end and stripped 
> the
> wires. Plugged it in to a pc with procomm running in "chat" mode. It was 
> just a
> process of elimination to see which one was sending data and which 
> received
> data. Hooked it directly to the GPS engine and it worked. A TTL to RS232
> adapter  for less than $4.
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