Most of the discussion here is way above my head, but I'm hoping somebody
will be able to help me.
I have a Sure GPS board, modified according to David Taylor's plan,
connected to a Windows 7 PC by USB (for power only) and by serial null-modem
cable to COM1 on a PCI serial card.
I am running ntpd 4.2.7p401 and have installed the signed serialpps.sys
(14.May.2012 16:08) in place of the standard serial.sys driver. I have also
installed the serialpps-ppsapi-provider.dll with a suitable value for the
PPSAPI_DLLS environment variable.
When I first set this up a year or more ago, I got the GPS_NMEA and PPS
entries displayed in the output from ntpq. However, I have just realised
that PPS is no longer there. NTP is still giving reasonable accuracy -
adequate for my needs - but I'd still like to get PPS working again.
I have also tried the same setup on my alternative boot into Windows 8.1 and
the result is the same. And I have tried rolling back to earlier versions of
ntpd and the serial driver (putting the PC into test mode for unsigned
drivers).
Here is the event log showing the startup of NTP (newest item at the top)
The first and second items from the top appear to show a problem.
Level Date and Time Source Event Task Category
Information 08/12/2013 15:37:38 NTP 3 None 127.127.22.1 local addr
127.0.0.1 -> <null>
Error 08/12/2013 15:37:38 NTP 1 None refclock_ppsapi:
time_pps_create: Exec format error
Information 08/12/2013 15:37:38 NTP 3 None Listen normally on 6 Local
Area Connection* 12 [fe80::2483:3039:3f57:fef5%12]:123
Information 08/12/2013 15:37:38 NTP 3 None Listen normally on 5 Local
Area Connection* 12 [2001:0:5ef5:79fb:2483:3039:3f57:fef5]:123
Information 08/12/2013 15:37:38 NTP 3 None Listen normally on 4
Loopback Pseudo-Interface 1 127.0.0.1:123
Information 08/12/2013 15:37:38 NTP 3 None Listen normally on 3
Loopback Pseudo-Interface 1 [::1]:123
Information 08/12/2013 15:37:38 NTP 3 None Listen normally on 2 Local
Area Connection 192.168.1.10:123
Information 08/12/2013 15:37:38 NTP 3 None Listen and drop on 1
v6wildcard [::]:123
Information 08/12/2013 15:37:38 NTP 3 None Listen and drop on 0
v4wildcard 0.0.0.0:123
Information 08/12/2013 15:37:38 NTP 3 None proto: precision = 0.400
usec (-21)
Here is the output from ntpq -p after a decent wait:
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
and this is my ntp.conf file:
driftfile "F:\NTP\etc\ntp.drift"
# PPS - serialpps.sys
server 127.127.22.1 minpoll 3
# NMEA serial port, 16 = 9600 baud, 2 = $GPGGA
server 127.127.20.1 minpoll 3 mode 18 prefer
server 0.uk.pool.ntp.org maxpoll 8 iburst
server 1.uk.pool.ntp.org maxpoll 8 iburst
server 2.uk.pool.ntp.org maxpoll 8 iburst
Can anybody suggest anything useful, please?
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