[time-nuts] Nortel Trimble thunderbolt
Brian Alsop
alsopb at nc.rr.com
Sat Jul 6 12:06:35 UTC 2013
On 7/6/2013 04:06, Chris Albertson wrote:
>
> But I think in this case it is just a three wire connection but still there
> is room for errors like for example is one of them a TTL level and the
> other RS-232. Some times you can mix the two, sometimes not.
>
This is a valid point. My radio will accept TTL and RS232 level signals
on the same port. (I should say 0 and 5 volts as the logic levels up to
-15/+15) However the polarity of them has to be proper. Most people
run a TTL level "RS232" signal (e.g. from a PIC) through a MAX232 and
think their done. In fact, the MAX232 inverts the polarity. The TTL
signal polarity must be changed for it all to work.
Regards,
Brian
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2012.0.2242 / Virus Database: 3204/5969 - Release Date: 07/06/13
More information about the Time-nuts_lists.febo.com
mailing list