[time-nuts] TTL to RS-232
Robert E. Martinson
REMartinson at rcn.com
Sat Feb 17 01:16:06 EST 2007
See also: http://www.futurlec.com/Mini_RS232_TTL_5V.shtml, its $4.90. They
also have a 3 volt version, same price. They have many other interesting
My recent order came from Australia so it took 2 weeks to arrive. Shipping
cost is reasonable.
Bob Martinson, N1VQR
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of N3IZN at aol.com
Sent: Tuesday, February 13, 2007 8:23 PM
To: time-nuts at febo.com
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
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
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
wires. Plugged it in to a pc with procomm running in "chat" mode. It was
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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