I recently needed to synchronize a Windows XP machine with GPS time. One of the requirements was sub-millisecond accuracy, which is no small thing for non-RTOS computers. David Hart to the rescue! He has written an driver for the NTP (network time protocol) service to incorporate a PPS (pulse per second) signal. The PPS signal, coming from a GPS, is highly accurate after sufficient time has elapsed for the GPS to sync with the satellites. I’ve received a lot of help from David Taylor; thanks again, David! So, without further ado, here’s an example of how to proceed with the installation:
[UPDATE: from David Hart – “I’ve posted a new serialpps-20091228.zip which should correct that [install.bat bug]. The (huge) debug build of serialpps-ppsapi-provider.dll is also added, along with a tiny bit of instructions in install.bat regarding PPSAPI_DLLS.”]
1. Configure hardware.
Connect the PPS signal to the DCD pin on the RS232 connector.
2. Install Meinberg NTP software.
Keep all defaults.
Create and use a special NTP account. (I always had problems using anything else)
Account name: ntp (use whatever you want)
Account pass: ntpntp
3. Stop NTP.
Run “C:\Program Files\NTP\bin\stopntp.bat”. There are alot of useful utils in the \bin directory.
4. Replace ntpd.exe with altered version.
Extract “ntpd.exe” from “ntp-4.2.4p6-DLH-QPC-20090315-bin.zip”
Copy to “C:\Program Files\NTP\bin”, replacing previous ntpd.exe.
5. Install SerialPPS.
Extract all from “serialpps-20090606.zip“.
Edit “install.bat”
On line 6, remove ‘if “x86″==”%PROCESSOR_ARCHITECTURE” ‘
Remove line 7 and 8 (you can just put “REM ” in front and they will be ignored, almost like a comment)
Run “install.bat”
Ensure that “serialpps.sys” was copied to “C:\Windows\system32\drivers”
Copy “serialpps-ppsapi-provider\x86\serialpps-ppsapi-provider.dll” to “C:\”
Right-click “My Computer”, go to properties.
Click “Advanced” tab
Click “Environment Variables” button
Under “System variables”, Click “New” button
Name: PPSAPI_DLLS
Value: C:\serialpps-ppsapi-provider.dll
6. Configure GPS (for Garmin)
Run “SNSRCFG.exe”
Connect to GPS
Configure
Set baud rate to 4800
Enable “Pulse Per Second”
Press F7
Enable GPRMC, disable others
Send config to GPS
7. Configure NTP
Edit “C:\Program Files\NTP\etc\ntp.conf”
Remove all entries, add the following
driftfile “C:\Program Files\NTP\etc\ntp.drift”
enable stats
statsdir “C:\Program Files\NTP\etc\”
statistics loopstats
server 127.127.22.1 minpoll 4 #PPS
server 127.127.20.1 iburst prefer minpoll 4 maxpoll 7 #GPS
#fudge 127.127.20.1 time1 0.4 refid GPS #uncomment and change time1 as needed
8. Ensure GPS is connected to serial port 1
9. Restart computer
10. Unplug GPS and disable Microsoft Ball-mouse (if listed)
Go to device manager: My Computer->Properties->Hardware->Device Manager
Under “Mice and other pointing devices”, right-click and disable “Microsoft Serial BallPoint”
11. Reconnect GPS Restart computer
12. Start NTP server
Run “C:\Program Files\NTP\bin\startntp.bat”
13. Monitor NTP server
Run “C:\Program Files\NTP\bin\ntpstatus.bat”
Both GPS and PPS should show up. After the GPS gets a lock, NTP should sync to the servers.
Refer to online documentation for help.
Alternatively, use “NTP Time Server Monitor” from Meinberg
To Uninstall PPS driver, run “uninstall.bat”.
March 22, 2024 at 12:17 pm
https://hei89me.org/
March 23, 2024 at 5:52 pm
backlinks
March 24, 2024 at 7:03 pm
cek my blog pliss
Link Idngoal
March 24, 2024 at 8:10 pm
kumpulan berita mengenai info bansos terkini terpercaya, dan terpopuler, politik, ekonomi, tekno, otomotif, dan olahraga ditulis lengkap dan akurat.
March 25, 2024 at 12:29 am
VEGASGG Raih Keberuntunganmu Bersama VegasGG
March 25, 2024 at 12:30 am
VEGASGG
March 25, 2024 at 12:32 am
VEGASGG.
March 25, 2024 at 1:05 am
VISABET88 Raih Keberuntunganmu Bersama VisaBet88
March 25, 2024 at 6:18 am
Kunjungi Halaman Junaslot Di http://WWW.JUNAFITUR.COM Dengan Bonus Yang Menarik Didalam nya,Junaslot Adalah Sebuah Platform Game Terkenal Yang Di Rekomendasikan Dari Pusat Slot Untuk Memberikan Pelayanan Terbaik Bagi Seluruh Pengunjung Atau Member.
Pelayanan Junaslot Selalu Terbuka Dalam 24jam Dan Bisa Di Akses Melalui https://kantorjuna.shop
#Junaslot #Rtpjunaslot #Linkalternatifjunaslot #Alternatifjunaslot #slotgacor #slotonline #slotterpercaya #junafitur
March 25, 2024 at 6:19 am
Kunjungi Halaman Junaslot Di http://WWW.JUNAFITUR.COM Dengan Bonus Yang Menarik Didalam nya,Junaslot Adalah Sebuah Platform Game Terkenal Yang Di Rekomendasikan Dari Pusat Slot
March 26, 2024 at 2:25 am
KOINVEGAS Raih Keberuntunganmu Bersama KoinVegas
March 26, 2024 at 2:52 am
official live hk you can visit LIVE DRAW HK HARI INI
March 26, 2024 at 4:03 am
very good content
March 26, 2024 at 4:41 am
your site is very good
March 26, 2024 at 4:55 am
sangat bagus di sini.
mainkan PG Scatter Hitam sekarang jg
March 26, 2024 at 11:04 pm
Halo perkenalkan saya Gaspol77 yang membuat sebuah hal menjadi lebih cepat, senang rasanya bisa berkumpul bersama komunitas ini. Dalam link alternatif games online terlengkap yang dibuat dari 2014 terlama.
March 27, 2024 at 2:38 am
These you will then see the most important thing, the application provides you a website a powerful important internet page: cook county criminal defense lawyer
March 27, 2024 at 9:13 am
Kunjungi halaman Slots di https://junafitur.com Terbaru dan cek promonya Deposit 30rb + Bonus 20rb, disana banyak sekali promo yang mampu kamu dapatkan. Bukan hanya pendaftaran akun GRATIS saja, di sini kamu mampu klaim banyak sekali bonus yang mampu kamu dapatkan, cobalah saja jika tidak percaya. https://heylink.me/Junaslothailand/
#Junaslot #Rtpjunaslot #Linkalternatifjunaslot #Alternatifjunaslot #slotgacor #slotonline #slotterpercaya #junafitur #situsjunaslot #slotjunaslot
March 27, 2024 at 9:54 am
Depo Hari ini WD Hari ini🤑
Aku mau ganti kekalahan2 kamu sebelumnya disitus lain yang selalu rungkad.. disitus aku https://kantorjuna.shop ga bkin kapok member dong..
Hanya depo 50K aku Bantu Naikin Profit kaka,Gimana Deal?
#slotgacor #slotonline #slothariini #slotterpercaya #rtpjunaslot #alternatifjunaslot #junaslot #junaslotgacor #junaslotonline
March 27, 2024 at 10:02 pm
شركة كشف تسربات المياه بالطائف
تقدم شركة كشف تسربات المياه في الطائف خدمات متخصصة ومحترفة في كشف وإصلاح التسربات المائية بكفاءة عالية. يتولى فريق الخبراء في الشركة مهمة تحديد مواقع التسربات بدقة، ويعمل على تقديم حلول مبتكرة وفعّالة لإصلاحها بشكل شامل، مما يضمن الحفاظ على سلامة وجودة المباني والمنشآت.
March 28, 2024 at 9:17 am
Cari Di Google JUNASLOT LAGI BANYAK EVENT MENARIK
LINK👉👉👉 https://junafitur.pro
PROFESIONAL & AMANAH PROSES DEPOSIT 1 DETIK SUPER MANTAP