The M12 is 3V logic. I assume the net4501 is 5V logic, so you may need
level shifting for the connection to work reliably and not damage the M12.
Steve
On 7/27/2011 2:02 PM, Chris Albertson wrote:
No, you can't simply wire two logic outputs together. One or the
other logic state is "stronger" (Yes I know poor analogy) and "wins".
The details are here.
http://en.wikipedia.org/wiki/Wired_logic_connection
But it is pretty easy to remove a chip especially if you don't care if
you damage it. The classic method is to clip all the leads from the
IC toss out the chip then de-solder the leads one at a time. When
chips cost 2 cents it's better to trash them than waste time with
complex rework methods. (Different story for expensive parts.)
On Wed, Jul 27, 2011 at 1:48 PM, Jason Rabel
<[email protected]> wrote:
This is only pseudo time-nuts related...
I'm wiring up (yet another) net4501 with a Motorola M12 GPS..
This net4501 has the RS232 driver chip there for the 2nd serial port (previous
units I purchased didn't, which made life easier for
me).
Can I solder my GPS tx/rx lines on the ttl side of the RS232 chip and will it
work? Or will the rs232 chip hold the voltages
low/high because there is no signal on the input sides?
This is just kind of "for future reference" question. I half wasn't sure if it
would work, and half didn't care to try and solder a
wire to a TSOP lead. So I bought a Max3222 PDIP and can make a proper
interface. The prototype board will also give me room for some
extra LEDs. ;)
This is kind of an experiment to see how a regular M12 compares to the M12+T
for NTP purposes. I'll probably build a fresh NanoBSD
image because I need to modify a line of code in NTPns to remove a TRAIM
command that makes the regular M12 PPS stop. I also want to
build the latest regular NTP distro.
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