"David Taylor" wrote in message news:[email protected]...
OK, Chris, so it's not a hardware issue. I don't know the message:
"Exec format error"
on Windows, but it sounds like the support DLL or driver isn't right.
When you list the COM1 device in the device manager, does it show the
serialpps.sys in the list of drivers? If you right-click, Properties
the .SYS or .DLL files, do they show the Unblock button. Perhaps
compare the files against those froma fresh download using a binary
comparison:
fc /b <working-file> <dowloaded-file>
Although it doesn't affect you, I recall that the Windows 8.0 to 8.1
upgrade required re-installation of a couple of drivers (one unsigned)
which I needed.
--
Cheers,
David
Web: http://www.satsignal.eu
David,
I have managed to fix it, and it was a bit unexpected. When I first
installed the Sure, I used a USB connection and got it working OK. I then
used a Serial-USB adapter and was pleased to find that it passed DCD and
that PPS was working. The jitter was rather high, though - about 0.3 mS. I
bought a 2-port serial PCI card and a serial cable, and immediately had a
massive improvement in performance. Recently, however, I found that PPS had
stopped working, as you have seen above.
What I think happened was this: when I plugged in the new card it used the
standard Windows serial.sys, which I replaced with serialpps.sys. Now this
card is part of a range of multifunction cards that offer various I/O
interfaces. At some time Windows Update probably found the manufacturer's
drivers and installed them (automatically, or as an option that I just
accepted). The new driver ignores serial.sys and has its own software. So I
poked around in the registry and changed the ImagePath for one of the card's
new services to point to serialpps.sys. This seems to have fixed it. As I
don't use the COMn ports for anything else, I won't worry about possible
side-effects.
Just to show the difference -
Before:
remote refid st t when poll reach delay offset
jitter
==============================================================================
*GPS_NMEA(1) .GPS. 0 l 5 8 377 0.000 -0.036
0.074
-109.169.89.48 193.79.237.14 2 u 28 64 377 22.674 -4.448
0.253
+betelgeuse.retr 158.43.192.66 2 u 15 64 377 22.621 -2.651
0.275
+ntp2.websters-c 193.62.22.82 2 u - 64 377 25.693 -3.363
5.207
After:
remote refid st t when poll reach delay offset
jitter
==============================================================================
oPPS(1) .PPS. 0 l - 8 377 0.000 -0.023
0.003
*GPS_NMEA(1) .GPS. 0 l 7 8 377 0.000 -0.038
0.003
+ntp.teaparty.ne 129.215.160.240 3 u 24 64 377 25.227 -3.584
0.324
+ntppub.le.ac.uk 158.43.192.66 2 u 41 64 377 26.930 -3.834
0.244
-orgin.sorch.inf 66.187.233.4 2 u 64 64 377 25.760 -3.058
0.104
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