[time-nuts] NTP/1-PPS/RS232 question

Mark C. Stephens marks at non-stop.com.au
Tue Aug 20 01:54:24 EDT 2013

I did an article here: http://www.vk2hmc.net/blog/?p=583

About 1/2 way down the difference between TX/RX and control RS232 signals is explained.


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Mark Sims
Sent: Monday, 19 August 2013 4:51 PM
To: time-nuts at febo.com
Subject: [time-nuts] NTP/1-PPS/RS232 question

The board is for another project.  It requires real RS-232 levels.  There is a MAX3232 chip on it.  Since the GPS has a 1PPS output,  I figured that I might as well bring it out.  There is no documentation on the pulse width or polarity...  it is what it is...  I'm probably hooking it straight to the '232 chip without any massaging.

There is also one more available RS232 input pin on the chip.  Any preferences for RTS or DTR?  There is a jumper for powering the board from the RI pin (pin 9) of the RS-232 connector.
Yes, this is right.  But watch the polarity.  It is easy to get it wrong.
 In RS-232 the controls pins are different from the data pins.

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