"Terje Mathisen" <""> wrote in message news:[email protected]...
[]
It would still be limited to the resolution of the rs232 clock, i.e.
~1ms, instead of the ~1us we usually get from PPS receivers.
OTOH, for many users 1-3 ms might be just fine, and statistical
processing might make it stable at the sub-ms level, but with unknown
absolute offset.
Terje
How precise can a 4800 baud serial port be in determining the start of a
start bit? About 1/4800s i.e. about 200 microseconds? Don't the chips
sample at 8 or 16 times baud rate, so couldn't the start bit be determined
to ~25-30 microseconds? And if the baud rate was lot higher (the unit
claims 57600 baud)?
You would be using the unit in a slightly different mode to an existing
GPS - just detecting the start of an RS-232 burst for the PPS, and then
reading a message for the actual value....
Cheers,
David
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