SERTEL ELECTRONICS (PVT)LTD COMPANY PROFILE Dear Customer, GPS Based time synchronization for various equipments of electrical / Instrumentation and computers. Ref: - Power generation / Distribution

With reference to the above we are glad to inform you and also introduce ourselves that we are the manufacturers of time synchronization with an accuracy of 1 micro sec for time stamping. This time stamping will facilitate to identify the problem First caused / trip to another where by all contactors / Relays connected to cascading operation.

The salient features of the Synchronisation system which is as following: Master Clock and Slave Clock • Synchronized to GPS receiver (through satellite) • The slave clock can be connected to entire factory at various locations displaying the same time

through out the factory in terms of hour min & Sec. Time Synchronization a) Electrical equipments Synchronization Time synchronization synchronizing the electrical parameters such as event recorder, disturbance recorder, fault recorder and sequential event recorder. PLC’s, data acquisition system and other intelligence or RTU (remote terminal unit). b) Instrumentation Synchronisation Intelligence instrumentation PLC’S, DC’S, DAS, SCADA and other intelligence RTU’S c) Networking of Computers

Various computers connected through landline with Ethernet synchronization by TCP/IP with 10 base T

or 100 base T with RJ 45 connector connected to the hub. We have also developed NTP server, NTP &

SNTP broadcast, NTP client to synchronies many computers.

We can give time synchronization output for various above equipment

requirement with any number of outputs such as Pulse, Potential free contact, IRIGB, RS232, RS485, BCD output also IPPS, IPPM, IPPH and for computers TCP/IP, network time protocol synchronization with any distance by using appropriate access such as line drivers, line receiver and also convectors RS485/232 convertor for synchronization of time with an accuracy for 1 micro sec.

d) Frequency Monitoring

With an advantage of time reference of atomic clock we can generate frequency 50HZ as standard

frequency. This can be monitored with a raw mains frequency generated. These both frequency are monitored,

differentiated and integrated with respect to time of your choice with a period of 15,30,45,60 sec’s with an

accuracy of 0.001HZ as a close monitoring for the healthy power of generation/ distribution. This also can be

monitored at various location of your plant similar to slave clock of time display the frequency can be

displayed at various locations with various character size of the display.

e) Power MonitoringBy using appropriate transducers of watt transducer, var transducers (i.e. active

and reactive power) with an analog output of 4 - 20 MA can be converted into digital input and monitored and

can be displayed with respect to standard time and std frequency to indicate any periodicity of active power

and reactive power monitored and can be connected to computer for report generation. WATT/VAR display

to many location similar to slave clock with large display for difference viewing.

f) Calibration for frequency With advantage of atomic clock time we convert various

frequencies and they are synthesized to give a very stable frequency available at all times

traceability to national standard can be used to calibrate a frequency based instruments such as

oscilloscope, wireless equipments, test and measuring instruments, time period recorders, walky-

talkies and other related frequency based equipments.The above five parameters can be housed on

a integrated panel to house to 19 inch rack with a power supply and battery charger to give

uninterrupt power for the functions of the above system. We here by SERTEL manufacturers time

and frequency indigenously and available at all times.We are enclosing herewith our user’s list for

your per usual and we are proud to associate with yourself and all the systems we are glad to

inform you

Ourselves that our system are operating on all 24hrs, 365 days continuously with a rugged

design for uninterrupt operation.

We are also enclosing our catalogue and other range of products, which we are manufacturing systems, and products. We are glad to associate with yourself on your projects, which would give us immense pleasure in executing to the satisfaction of both of us with an advantage of helping each other for mutual benefit. We request you to kindly send us your valuable enquiry and also register our name in your

vendor’s list. We are also glad to inform you that our products are approved by various consultant agencies to name important companies such as NTPC, Power grid, EIL, TCS, Tata power, BSES, Reliance power, GAIL and other consultancy also. In case if you can inform us as your consultant we are glad to take an approval to enable yourself to use our equipment for your projects. Yours faithfully, For SERTEL ELECTRONICS PVT. LTD R. GOPALAN -CHIEF EXECUTIVE R. PRABAKARAN – DIRECTOR

SERTEL ELECTRONICS PVT. LTD 377, NEHRU NAGAR I CROSS STREET OLD MAHABALIPURAM ROAD CHENNAI 600 096 SOUTH INDIA Phone : 91-044- 23454060 / 4062 FAX 91-044-23454061 Email : telser@md4.vsnl.net.in (or) sertel@sify.com

INDUX

Pages 1. INTRODUCTION 1 2. TIME SYNCHRONISATION SYSTEM 2 – 3 3. SERTEL RS 232 OUTPUT 4 – 5 4. RS 232 PC Application Software Installation Procedure 6 5. TCP-IP OUTPUT 7 6. TCP-IP Output PC Application Software Installation 8 – 9 7. PFC / PULSE Output Thumbwheel selection procedure 10 – 11 8. PFC / PULSE Output Selector switch selection procedure 12 – 13 9. IRIG B Output 14 – 15 10. DCF 77 Output 16 – 20 11. Slave Output 21 12. OPERATION 22 13. Future of GPS Receiver 23 14. Alarms Output 24 15. Warranty 25 16. TEST CERTIFICATE 17. WIRING DRAWING 18. CIRCUITS

- 1 - I. INTRODUCTION :

Global Positioning System is an absolute system to provide continuously the following to unlimited users. 3 dimensional Position Fixing (Latitude; Longitude & Altitude). Velocity ( Speed/Course ) measurement by detecting the Doppler shift in the radio signals emitted by GPS Satellites. a) Time Reference generation, utilising the fact that the system is operated on a common precise

time base. b) GPS provides continuous worldwide coverage, 24 hours a day under any weather conditions. c) Satellites distributed in 6 orbital planes (4 in each plane) spaced around the equator, pass over

the earth at an altitude of approximately 20,000 kilometers. Each satellite has an orbital period of 12 side real hours (11 Hrs. and 58 Mnts. of civil time). A single satellite will orbit the earth twice a day, tracing the exact foot print path; but passing 4 minutes earlier than the day before. This ensures that at least 4 satellites will be in view at any time above any point on earth. Each GPS satellite bears an ultimate precision clock utilizing Rubidium-Cesium oscillation whose accuracy is comparable to Inter national Atomic Time.

d) GPS Receiver collects the data from GPS Satellites and out puts a time base pulse (1PPS) every

second in precise synchronisation with UTC/IST. Each 1PPS Pulse is accompanied by a Serial Data packet output ( A real time data comprising of Year, Month, Date, Hour, Minute and Second), which is a time stamp for that pulse. This output is utilised by Master Clock to synchronise its time with UTC/IST with a maximum uncertainity of 1 micro second and generate various outputs to synchronise any number of digital clock /microprocessor based systems.

e) GPS system is sponsored and operated by US Department of Defence. Civilian access to the

system is guaranteed through an agreement between US DOD and US DOT (Dept. of Transportation) and is subject to US Govt. Selective Availability (SA) policy

f) The Global Positioning system (GPS) is operated by the U.S.DOT and is subject to U.S.

Government selective availability (SA) Policy. SERTEL is not liable for the degradation by SA Users are expected to be familiar with system and make . Full use of it with their own responsibility.

g) SERTEL Electronics Pvt. Ltd reserves the right to make changes to our products any

specifications without notice.

Contd…

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II SERTEL TIME SYNCHRONISATION SYSTEM

a) GPS ANTENNA

Model : GPA-014

Type : Helical Mount : Fixed (necessary mounting brackets will be provided) Axial ratio : 5 dB

Co-axial cable : Low Loss Coaxial Cable (0.33 dB/metre), 50 metre along with matching connection

Connector : BNC-J Total gain : Over 30 dB Noise figure : Less than 2.6dB Supply Voltage : 5 V DC Operating Temp. : -30 to +80 Deg.C Storage Temp. : -40 to +85 Deg.C Dimensions : Bottom ∅ : 32mm Top ∅ : 69 mm Length ∅ : 85 mm

Contd… -

- 3 -

b) GPS RECEIVER

Model : T-GPS-300 Type : Micro Controller type Display : Backlit LCD display 24 Hours format

Time Accuracy : Better than 1 PPM Satellite Sig- Input : 1575.14 MHz from Antenna

Antenna i/p Connector : BNC (F) CONNECTOR For ANTENNA Input

Front Panel : 1. LCD Display ( Julian days, HH,MM,SS-

DD, MM,YY,Latitude,Longitude,Day of weake Status and number of satellites ), 2. Power, Watchdog,GPS Lock, Event, GPS Data Indicators LED Supply Voltage : 90 to 260V AC/DC (Other Supply Voltage Consider ) Back Panel : AC VOLT input terminal , Fuse, On/Off switch , output terminal and selector switches Environments : Temp. : 0-50 deg.cen RH : Up to 95% non condensing Mounting : To suit Standard 19” Rack System Dimension : Width : 484 mm(W) X 325 mm(D) 3U (H)

Contd…

- 4 - OUTPUT FROM GPS RECEIVER MODEL No T-GPS-300 RS 232 Serial port output

SERTEL provide a serial asynchronous bi-directional data port . The serial data port is factory configured with RS 232 (standard) signal level. RS 232 output is compatible electrically and mechnically with the EIA standard RS 232C as described for data terminal equipment (DTE)

9 pin ‘D’ Connector (M) pin connections Pin Connections

1. ………… NC

2. ………….. RS 232 output

3. ………….. NC

4. …………. NC

5. …………. Ground

6. …………. NC

7. ………… NC

8. …………. NC

9. …………. NC

RS 232 output from SERTEL as follows :

Level ……. ASCII

Data Length …… 8 bit

Baud rate ……..9600

Event ……. Nun

Stop bit …….. 1

Data transmission every second

-5-

RS 232 format $ 30 XX XX XX XX XX XX CR LF LINE FEED CAR-RET YEAR MONTH DAY SECOND MINUTE HOUR STATUS START

RS 232/485 INTRODUCTION HAIL FORMAT

SERTEL provide a serial asynchronous bi-directional data port . The serial data port is factory configured with RS 232 (standard) signal level. RS 232 output is compatible electrically and mechnically with the EIA standard RS 232C as described for data terminal equipment (DTE)

9 pin ‘D’ Connector (M) pin connections Pin Connections

1. ………… NC

2. ………….. RS 232 output

3. ………….. NC

4. …………. NC

5. …………. Ground

6. …………. NC

7. ………… NC

8. …………. NC

9. …………. NC

RS 232 output THL format :

Level ……. ASCII

Data Length …… 8 bit

Baud rate ……..2400

Event ……. Nun

Stop bit …….. 1

Data transmission every second

PROTOCAL : XXX ; XX ; XX ; XX ? ; XXXX CRLF Julian hour minute second year day

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RS 232 PC Synchronisation, Software Installation Procedure

Service Name: Sertel time synchronisation system Input: RS232 - Sertel Format OS Platform: WinNT/Win2000/Win2003/WinXP Synchronisation at: Every Minute Steps to follow ( to register a timesync service): --------------------------------------------------- 1. Copy RS232 folder into c:\ as (c:\RS232) 2. Click "start" 3. Goto "Run" and type "command" and click "OK" button 4. The MS-DOS Screen will display in front of you. 5. type c: then press enter 6. type cd\ then press enter 7. type cd RS232 then press enter 8. Now verify that you are in c:\RS232> 9. Now type "sc create timesync binpath= c:\RS232\rs232.exe" 10. type cd\ then press enter 11. type cd c:\winnt\system32 then press enter 12. Now verify that you are in c:\winnt\system32> 13. type "mmc services.msc" (in MS-DOS Prompt or "Run" Dialog box) 14. find "timesync" in services list and double click it. 15. Make it is as "automatic" in start up type 16. goto Log on tab and enable "Allow service to interact with desktop" if you like to have a display on desktop. 17. Apply the above settings and Start the service and see whether the display appears or not. 18. Restart your PC and check whether the service starts automatically or not. Note: Registering a service under Windows NT based PC's, will normally require a Administrator level access. So, before registering a service you are requested to have a administrator logon access (i.e Administrator Password) Sertel Electronics telser@md4.vsnl.net.in or sertel@sify.com

7

TIME SYNCHRONISATION TCP/IP OUTPUT PC SYNCH- THROUGH NET TCP / IP PORT

Introduction The EAD connects serial devices to Ethernet network using the IP Protocol. The EAD connects serial devices through a TCP data channel connection to computers. Network protocol The EAD uses IP protocol for network communication. For network Connections to the serial port of TCP. Internet protocol (IP) address to identify an individual computer IP network must have a unique IP address Sample IP address 192.168.1.254 PORT NUMBER The EAD serial channel (port) can be associated with a specific TCP Port number . port number 3001(as a source port no)is reserved for IFD (internet Fax dialer) configuration

-8-

Sertel Provided TCP/IP output This will synchronies More Number of PC Through RJ45 Connection. To Connect 100/10 BasT HUB from Main Hub to All PC To Synchronies With PC Install Software The Following Step to Install the Software

Service Name: Sertel time synchronisation system Input: TCP/IP - Sertel Format OS Platform: WinNT/Win2000/Win2003/WinXP Synchronisation at: User Selectable via syncip.ini Steps to follow ( to register a timesync service): ---------------------------------------------------

1. Copy TCPIP folder into c:\ as (c:\TCPIP) 2. Click "start" 3. Goto "Run" and type "command" and click "OK" button 4. The MS-DOS Screen will display in front of you. 5. type c: then press enter 6. type cd\ then press enter 7. type cd TCPIP then press enter 8. Now verify that you are in c:\TCPIP> 9. copy syncip.ini file to c:\winnt folder (MS-DOS Command "copy syncip.ini c:\winnt") 10. Now type "sc create timesync_ip binpath= c:\TCPIP\tcpserv.exe" 11. type cd\ then press enter 12. type cd c:\winnt\system32 then press enter 13. Now verify that you are in c:\winnt\system32> 14. type "mmc services.msc" (in MS-DOS Prompt or "Run" Dialog box) 15. find "timesync_ip" in services list and double click it. 16. Make it is as "automatic" in start up type 17. goto Log on tab and enable "Allow service to interact with desktop" if you like to have a display on desktop. 18. Apply the above settings and Start the service and see whether the display appears or not. 19. Restart your PC and check whether the service starts automatically or not.

Note: Registering a service under Windows NT based PC's, will normally require a

Administrator level access. So, before registering a service you are requested to have a administrator logon access (i.e Administrator Password)

-9-

syncip.ini file contents: ------------------------

[Network]

Server IP Address=0 // Leave this as 0 for automatic server detection or //otherwise specify server IP address (default-0) [Sync] Sync Interval=0 // Synchronization Interval: 0-Every Second 1-Every Minute //2-Every 1/2Hour,3-Evey Hour

Sertel Electronics telser@md4.vsnl.net.in

SERTEL NTP/SNTP ***************************************************************************** Service Name: Sertel time synchronization system ***************************************************************************** STEPS TO CHANGING IP ADDRESS:(windows ONLY) ------------------------------------------------------------ NOTE1:”SWITCH ON THE UNIT AND CONNECT THE ETHERNET CABLE WITH THE NTP UNIT”. NOTE2:”YOU SHOULD CHANGE YOUR SYSTEM IP ADDRESS RELATED TO OUR DEFAULT IP ADDRESS (192.168.1.254)”. NOTE3:”THEN ONLY YOU CAN ABLE TO CHANGE IP ADDRESS INSIDE NTP UNIT”.

Click START at the bottom left corner of the desktop.

Click Run.

You have to type "telnet 192.168.1.254" and click ok.

It will show ts7200 login: here you have to type "admin" then press enter button. It will show password: here you have to type "ntp" then press enter button.

Now you can see '$' symbol.

Now you should type the command "cd /etc/sysconfig" then press enter button.

Now you should type the command "vi ifcfg-eth0"then press enter button.

It will show IP address and subnet mask details.

Here you can see IPADDR=192.168.1.254 at the second line. Here you press down key to second line then press right (->) key to move cursor right

side up to end (IPADDR=192.168.1.254_). Now you press x button till (IPADDR=_) then stop pressing.

Now sertel's default IP address deleted. Now you enter " i " button once, then you press right (->) key once (this is for give 1

space between numbers and letters). Now you type your IP address according to your requirement (Note: should not use any

using IP address in your network).

After type your new IP address press Esc button two times. Now you have to type ":wq"(colon wq) press Enter.

Now you can see '$' symbol. Now type, "reboot".

Now your ntp server IP addresses have been changed. NOTE4:"YOU SHOULD CHANGE YOUR SYSTEM DEFAULT IP ADDRESS"

***************************************************************************** STEPS TO SYNCHRONISE WITH (windows XP and windows 2003) SYSTEM: -----------------------------------------------------------------------------

Click "START" at the bottom left corner of the desktop then go to Run.

Type "regedit" then enter.

Click HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32time\Time-Providers\Ntpclient. (root key for the time service).

Right click specialpollinterval and click modify and delete the value 604800 and type 3C.

Click KEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32time\config (root key for the time service).

Right click MaxNegPhaseCorrection and click modify and delete the value 54000 and type ffffffff.

Right click MaxPosPhaseCorrection and click modify and delete the value 54000 and type ffffffff.

Right click Update Interval and delete the value 00057e40 and type 3C. **************

Right click the time at the right bottom corner.

Select Adjust date/time.

It will show date and time properties.

Now you have to select Internet Time. And you have to tick the option that Automatically synchronize with Internet Time Server.

Then you have to enter your new NTP server IP address inside the server box. Now you click Apply, then click Update Now option, then click ok. Now your system gets synchronized. Close the date and time window.

***************************************************************************** STEPS TO SYNCHRONISE WITH (Other than windows XP) SYSTEM:

You have to use net time software for synchronizes your pc time. Double click NetTime-2b7.exe. Follow all instructions. It will store its services at START-All Programs- Net Time. More over it will store its icon at right bottom corner near time. Now you have to right click net time icon and select properties. Now you have to select settings. Here you have to enter your NTP server address and you have to select SNTP. Here you have option for update intervals etc. According to your wish you can enter your

values and give "ok". Now it will show warning. Here you click "NO". Now your pc time get synchronized.

*****************************************************************************

STEPS TO SYNCHRONISE WITH (Linux) SYSTEMS: -----------------------------------------------------------------------------

In DOS mode type "ntpdate -u server address". In graphics mode double click at time, tick Automatically synchronized with NTP

server option. Enter your NTP server address click Update Now. And give ok. Your system gets synchronized.

*****************************************************************************

-10- PFC PULSE OUTPUT contact. SERTEL provided pulse output From GPS receiver for every second, every minute

Every half hour, every one hour, contact Pulses available. All out puts are fully

Isolated and Programmable ( USER SELECTABLE ) Contact output. User to select

Required pulse contact by using SELETOR switch Only

Switch on the SERTEL GPS Receiver wait for 5-10 Second To observe Time are available in Front panel

LCD Display At the same time contact pulses are available rear side contact output terminal

PRINCIPLE OF OPERATING SELECTOR SWITCH SERTEL provided contact output 3A /220V DC potential free control relays for HOUR, HALF Hour, Minute, Seconds at the duration of 50 milli second contact. Rating : 3 Amps /240 AC/ DC. HOUR, HALF , HOUR,MINUTE,& SECOND selectable by selector switch provided by GPS Receiver unit rear panel. Thumb Wheel selection provided for every required contact output . PROCEDURE FOR SELECTION SERTEL Signal Conditioner Rear Side Three Nos Thumbwheel Station Provided For Contact Output Selection First Two Station Selection of Relays. Third One Selection of Pulse Contact output. PFC / PULSE FIELD PROGRAMMING PROCEDURE, • TURN-ON LOCK SWITCH, • SET RELAYS TO PROGRAM ON THUMBWHEEL • SELECT REQUIRED OUTPUT AS BELOW SETTING • TO REGISTER, ENTER THE PUSH SWITCH • RL 01 TO 10 THUMBWHEEL FOR RELAY SELECTION • PC 1 TO 5 PULSE DURATION SELECTION • TURN OF LOCK SWITCH.

-11- THUMBWHEEL PROGRAMING FOR PULSE SELECTION TABLE DURATION SELECTION RL-1 R L-2 R L-3 R L-4 R L-5 R L-6 R L-7 R L-8 R L-9 RL-10 SECOND

01 1

02 1

03 1

04 1

05 1

06 1

07 1

08 1

09 1

10 1

MINUTE

01 2

02 2

03 2

04 2

05 2

06 2

07 2

08 2

09 2

10 2

½ HOUR

01 3

02 3

03 3

04 3

05 3

06 3

07 3

08 3

09 3

10 3

HOUR

01 4

02 4

03 4

04 4

05 4

06 4

07 4

08 4

09 4

10 4

DAY

01 5

02 5

03 5

04 5

05 5

06 5

07 5

08 5

09 5

10 5

For example (a) Selection of SECOND in 1st Relay contact output

Simply turn RL Thumbwheel in 01 and PC in 1 Every Second Contact Available at 1Marked Output Connector

(b) Selection of MINUTE in 2 Relay contact output

Simply turn RL Thumbwheel in 02 and PC in 2 Every Minute Contact Available at 2Marked Output Connector

(b) Selection of ½ Hour Relay Contact at 3 Relay output

Simply turn RL Thumbwheel in 03 and PC in 3 Every ½ hour Contact Available at 3Marked Output Connector

(c) Selection of Hour at Relay Contact output at 07 output

Simply turn RL Thumbwheel in 07 and PC in 4 Every Hour Contact Available at 7Marked Output Connector

(d) Selection of Day at Relay Contact output at 05 output

Simply turn RL Thumbwheel in 05 and PC in 5 Every DAY Contact Available at 5Marked Output Connector

contd….

RELAY CONTACT OUTPUT & PULSE

- 12 -.

PULSE OUTPUT (Selector switch method) model T-GPS-300

PRINCIPLE OF OPERATING SELECTOR SWITCH SERTEL provided contact pulse output 3A /220V DC potential free control relays for HOUR, HALF Hour, Minute, Seconds at the duration of 50 milli second contact. Rating : 3 Amps /220 DC. HOUR, HALF , HOUR,MINUTE,& SECOND selectable by selector switch provided by GPS Receiver unit rear panel. 4 Rotary switch with 4 relays are provided for every required pulse contact output . PROCEDURE FOR SELECTION GPS Receiver Unit Rear Panel 4 Nos. of Selector Switch available with SEC,MIN,1/2H,HOUR, by marking of 1 PPS , 1 PPM, 1/2 PPH, 1 PPH . Selector switch knob also marked by arrow mark. User can select any one of pulse contact output from GPS Receiver Unit. Turn the knob to Seconds, Minutes, 1/2 Hour, HOUR position. The programmed contact outputs are available rear panel of GPS Unit via. Barer Connectors. All the 4 Selector Switch programmed separately. User can easily select any one of contact pulse output by using selector switch. Pulse contact available at rear panel of contact terminal.

-13-

For example (e) Selection of HOUR Pulse contact output Simply turn any one of selector knob to HOUR location every Hour one contact available At connector (b) Selection of Half Hours contact output Turn the knob to 1/2 H location every Half hour conduct available at Connector (f) Selection of Minutes Turn the knob to MIN location every minute available at Connectors (g) Selection of Seconds Turn the knob at S location every seconds available at Connectors At a time 4 contact s available in different requirement. Note : If more details required, please contact the following address.

SERTEL provided 4 Nos Isolated Contact pulse out put each contact output suitable for 220V dc 3 Amp Contacts.

-14-

IRIG- B INTRODUCTION

IRIG-B standard time format by telecommunication working group . Inter range

instrumentation group range commanders council describes IRIG-B it is available by writing

secretly range commanders council. White sand missile range new Mexico 880022.

The standard time format of IRIG-B Code were designed for us in missile , satellite and

space research programmes. Use of these code facilities efficient interchange of test data

Those formats are suitable for recording on magnetic tape oscillo graphics film and for real

time transmission in both automatic manual data reduction . IRIG-B from the SERTEL

T-GPS-300S is suitable for remote display driving magnetic tape recording and may other

use. IRIG-B codes in the strip sense encode Universal Co-ordinated Time (UTC) in 24 Hours

format only not local time. Nonetheless this instrument can encode UTC and IST time in 24

hours format.

The frame length of IRIG-B is 1 second long and contains 100 elements (pulse) each of whichstarts every 10 milli second (Unmodulated) and 1 Milli second (modulated) . SERTEL

T-GPS-300 S provide output of IRIG-B in two ports . One is IRIG-B pulse code output and other one is IRIG-B amplitude modulated pulse 1 Khz output at rear panel of BNC Connectors. This will help us long distance communication

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- 16 -.

SERTEL DCF 77 Introduction DCF time code (slow code, 1 bit/sec.)

Minute pulses (time marks)

Hour pulses (optional time marks, 1 second duration). The time information corresponds to local time (UTC + programmed time shift). DCF time code : The DCF time code (as transmitted by the German DCF77 transmitter on 77.5 kHz) is a slow serial time code consisting of 60 bits, transmitted at the rate of 1 bit/s. It takes 1 minute to deliver the full code. This time code is handy for many types of applications and it is becoming widely-used in Europe. The coding is as follows : Bit rate : 1 bit/sec. Negative pulses, beginning on the second (open collector starts conducting).

Pulse duration 0.1 second = value "0"

Pulse duration 0.2 second = value "1"

No pulse at second 59 of every minute (---> minute identifier !)

-17-

The time information is coded as follows : Bits 0 - 14 : always=0; 15 : quality of radio-synchronization : good =1, bad =0; 16 : upcoming time change : normally=0, before time change=1; 17 : winter=0, summer=1; 18 : winter=1, summer=0; 19 : always=0; 20 : always=1; 21-27 : minute (of next minute); 28 : combines with bits 21-27 for even parity; 29-34 : hour; 35 : combines with bits 29-34 for even parity; 36-41 : day of the month; 42-44 : day of the week (Monday=1); 45-49 : month; 50-57 : year; 58 : combines with bits 36-57 for even parity. 59 : the pulse is missing (minute identifier).

By menu, the GPS unit may be programmed to stop delivering the DCF code when GPS synchronization is bad. Minute Pulses, Time Marks : Minute pulses duration gives following indication :

Length Indication

1 second Minute mark when GPS synchronization OK 2 seconds Minute mark when GPS synchronization NOT OK4 seconds Minute mark at the full hour (local time) 10 Seconds Minute mark at 24.00 o'clock (local time)

-18-

Geo-version : output 1 (DCF code or minute pulses) may be programmed to operate on the internal quartz time base only, without automatic corrections by GPS. GPS information is then obtained from output 2, and used for compensating the quartz oscillator drift. Output 2, "F. Code", open collector, max 35 VDC, 500 mA, with the following Ssgnals :

In normal operating mode (permanent receiver operation) : "Fast Code" time code format (specifications on request). This fast code is not available when an RS-232 or RS-485 format is used (menu selection).

Output 2 in low power mode (geo-version) : slow code, bits are synchronous with output 1, giving time comparison between internal time and GPS time. This code is useful together with the DCF code operating on the internal quartz time base : it allows to correct for the drift of the quartz time base. The coding is as follows : Slow code "Time comparison between internal time and GPS time, based on latest GPS Reading" (geo-version) : Bits 1 to 12 : milliseconds of GPS time at time T (BCD-coded : 4 bits for every digit). Bits 13 to 19 : seconds of GPS time at time T. Bits 21 to 41 : time T = time of the last GPS reading = bits 21 to 41 of output 1 when the last GPS reading as made (at the full minute). Bits 42 to 48 : minute of GPS time (local time) at time T. Bits 49 to 54 : hour of GPS time (local time) at time T. Bit 56=1 for normal high precision mode; =0 for power saving low precision mode. Bit 57=1 : DCF code synchronized when GPS available; =0 : DCF code on quartz time base.

OMEGAFACE code (option) : fast code compatible with OMEGAFACE code (repetition rate 1 code/minute, bit length 0.02 second, 1600 Hz modulation).

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Output 3, current-loop (optional) : 20 mA current-loop output (passive). Voltage to be applied : 12 - 40 VDC. Minimal voltage at 20 mA : 9 V. 1=20mA, 0=4mA.). Same signals as output 1. Output 4, RS-232/RS-485 : output of time information in RS-232 ASCII format, 1200 Baud. 5 formats selectable by menu. Options : - 5 meter cable with RS-232 sub-D 9-pin connector. - RS-485 instead of RS-232. Pin allocation :

GND

RS-232 output

RS-485 output (option)

RS-485 output (option)

Vdd (+5V) Time message formats : Legend : HH=hours; MM=minutes; SS=seconds; MIS=milliseconds; DD=day of month; d=day of week (Monday=1); DOY=day of year; mm=month; YY=year; s=status byte.

1. <STX>HH:MM DD.mm.YY0<ETX><BCC> Byte format : 1 start-bit, 7 data-bits, 1 parity-bit (even), 1 stop-bit. Repetition rate : 1 message every minute, beginning exactly on the minute. BCC : XOR over all bytes from H to ETX (even parity).

2. HH:MM:SS.MIS DD/mm/YY DOY d s<CRLF> Byte format : 1 start-bit, 8 data-bits, 1 stop-bit, no parity. Repetition rate : 1 message every minute, beginning exactly on the minutes. Status byte : normally=30H; leap year=31H; bad GPS synchronization=34H; leap year and bad GPS synchronisation=35H.

3. <STX>SSMMHHDDmmYYs<ETX> Attention : the order of the tens and units is inverted. The units come first, then the tens. Byte format : 8 data-bits, 1 stop-bit, no parity. Repetition rate : 1 message every minute, beginning on the minute. Status byte : bad GPS synchronization and winter time=31H; bad GPS synchronisation and summer time=33H; Good GPS synchronisation and winter time=35H; Good GPS synchronisation and summer time=37H.

-20-

4. <STX>/K/Y/Y/m/m/D/D/d/D/O/Y/H/H/M/M/S/S/s/<LRC><ETX> Byte format : 8 data-bits, 2 stop-bits, no parity. 0.5 ms time slot between the bytes. Repetition rate : 1 message every minute, ending exactly on the minute. K=N for standard time (winter); =S for daylight saving time (summer). Status byte=S when good GPS synchronisation; =' ' when bad GPS

synchronisation. LRC : parity byte, XOR over all bytes from "K" to "s".

5. YYmmDDHHMMSSd<CRLF> Byte format : 1 start-bit, 7 data-bits, 1 extra-bit, 1 stop-bit, no parity. Repetition rate : 1 message every minute, beginning on the minute.

-21-

DIGITAL SLAVE CLOCK : MODEL No. T-SL300-100-6D

TECHNICAL SPECIFICATIONS:

Display : HOUR, MINUTE & SECONDS in 24 Hrs format Display size : 100mm. 7 segment Red LED - 6 Digits. Input : Differential Pulse from GPS RECEIVER. Power Supply : 230V AC +/- 10% Connection : Slave clocks are connected to Master Clock by

3 core copper Conductor. (MULTI DROPSYSTEM) Slave updation : Every second

Environments : a) Temperature : 0-60 Deg.C

b) RH : 0-90% non condensing Mounting : Wall Mounting / Table Top Mounting Dimensions : As per drawing

-22- OPERATION

1. Fix the antenna fixing Bracket firmly ensuring that the antenna had unobstructed view of the sky 2. Mount the antenna on the vertical post using 2 nos. clamps and tight

3. Connect the co-axial cable to the antenna and firmly fix the cable on the post

4. Install the GPS receiver

5. Connect power supply ensuring proper polarity (Note supply voltage 127V AC/DC)

6. Switching ON, the GPS Receiver first fixes its own position by receiving the navigation message

from 4 satellites and thereafter continuously outputs 1 PPS in precise synchronisation with UTC so long as the following conditions are meet a) UTC parameter is available b) After own position has been fixed by receiving 4 satellite, at least one satellite is traced

continuously

7. The GPS Receiver internally controls its accuracy of time and will not output is available as indicator by the glowing of RED LED in the front panel, its accuracy is within

+/- 1 msec, of UTC.

8. TTFF : The conditions and period of time from POWER ON to first fix are as follows

Conditions and period of time from Power on to first fix are as follows:

Power on Accuracy availability of Initial Setting

Validity TTFF

Conditions L/L Time Almanac Ephemeris Typical

Warm Shaft Within 1 Deg Within 10 Min 1 Month 4 Hrs 20 Sec.

Cold Start Within 1 Deg Within 30 min 1 Month N/A 45 Sec. Autonomous Start

N/A N/A N/A N/A 2 Min

-23-

FEATURES OF GPS RECEIVER

• Uninterrupted parallel 8 channel tracking

• Data Calculation using upto 8 GPS satellite for accuracy

• Fast GPS Satellite acquisition

• High accuracy of UTC +/- 100 nanosecond (2 σ) in fixed observation point SPS

Mode (Standard Positioning Service using C/A Code System)

• Output stable 1 PPS (pulse per second) signal even when switching satellite due to Processing of 8 satellite data)

• Precision leap second adjustment is performed automatically

• Specialised in time synchronisation and clock calibration NOTE : With Standard Positioning Services the accuracy of GPS is 2 Drms (two times distance root main square error)

Horizontal Accuracy: 100 Mtrs. Vertical Accuracy: 146 Mtrs Time: +/- 100 nano seconds with respect to UTC time With selective availability these accuracies are degraded. With respect to time the degradation is approximately 300-500 nano seconds

Contd.…

-24-

ALARMS DRY CONTACTS AND ISOLATED 1. GPS SYNCHRONIZING / LOST SERTEL provided isolated dry contact for GPS lock / lost . Switch on GPS system Wait for 15 minutes men time GPS lost contact available at GPS terminal. Front panel GPS locked LED plink every second contact not available from terminal System normally set by NC mode when GPS lock the contact change to NO mode. 1. POWER FAILURE

127V DC available contact in NC mode. No power available contact in NO mode

2. WATCHDOG System input and out put are normal contact in NC mode. No signal from system Contact in NO mode

LED INDICATION GPS LOCK RED Green INDICATE WHEN GPS LOCK WATCHDOG RED LED INDICATE MICROCONTROLER INPUT/OUTPUT GPS DATA RED LED INDICATE AFTER GPS SYNCHRONIZING EVENT RED Yellow INDICATE EVERY MINUTE BY continue glow POWER RED LED INDICATE POWER ON

- 25 - WARRANTY SERTEL GPS Receiver System is warranted against defects in material and workman-ship. For manpower and passive components (like switches, resistors) this warranty is for a period of 12 Months from the date of supply. Expendable items like LEDs, ICs, Transistors, Crystals and other active components are warranted only for a period of 3 months from the date of supply. The warranty for the items repaired / replaced shall not exceed the period for which the equipment was originally warranted.

The foregoing warranty excludes routine maintenance, and calibration. The warranty does not apply to defects resulting from improper or inadequate maintenance, unauthorized modification or misuse and operation of the product not in conformity with operation manual.

In case of any malfunction, please deliver the equipment to our works and collect the same after repairs. The equipment shall be dispatched to you after repairs provided the packing and forwarding charges are borne by you.

The invoice must be provided at the time of warranty service. AFTER SALES SERVICE

Each instrument has been subjected to strict quality control. Inspection prior to being shipped. However should any malfunction occur, please contact us.

Cntd…

5

5

4

4

3

3

2

2

1

1

D D

C C

B B

A A

<Doc> <RevCode>

AVR SECTION

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2 5Saturday, June 05, 2004

Title

Size Document Number Rev

Date: Sheet of

PB0PB1PB2PB3PB4PB5PB6PB7

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SW9SW10SW11SW12SW13

SW14SW15SW16

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PB0PB1PB2PB3PB4PB5PB6PB7

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SW25SW26SW27SW28SW29SW30SW31SW32

SW1SW2SW3SW4SW5SW6SW7SW8

SW9SW10SW11SW12SW13

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SW17SW18SW19SW20SW21SW22SW23SW24

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