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Master/Slave Clock

Wired and ZigBee Wireless master/slave clock

1.) Introduction:

Basically, the master clock take signal from GPS or NTP (via internet) and send time/date data to all slave clock wired or wirelessly.

a). The advanced ZigBee wireless transmission technology is ideal to be implemented into the wireless master/slave clock system. It transmits low power but longer distance transmission.

b). Master clock broadcast time/date information to all clock every second. The transmitting power from master clock is only around 0.06W at frequency 2.450~2.480Ghz which worldwide approval frequency.

c). Each slave clock acts as a repeater. Max. repeat times is 19, average transmission range is about 100 meters. LOS range will be 500 meters.

d). The slave clock colon will stay lit up when it get synchronized. If more than 10 minute no data received from wireless module, the slave clock will run base on its time base (crystal) and flashing the colon.

2). System diagram

SC: Slave Clock acts as repeater for signal transmission from master clock.

3). MASTER CLOCK

 

Model:SDC-OC3B

19” Rack mount available. Ivory metal case, 435mm(W)x295mm(D)x45mm(H),

wall mount (option)

I/P power: AC Adaptor from 100~240VAC to 19VDC/3A (UL/CSA, CE approved) or directly from AC24V/2A.

Time base: (1). GPS receiver, (2) NTP Ethernet card required, (3) Internal crystal

A visual synchronization status indicator for GPS receiver

O/P :    

(1) 4 x RS422 ports---------- to wired RS422 clocks or equipment

(2) “RESET” + “CLOCK” pulses to wired secondary digital clock(24D20A, 24D40A, 24CC10) and Analog clock (24SC12R-SPL,24SC15RSPL) can be synchronized.

(3) Wireless RF signal to all wireless clocks (Antenna 480mm)

(4) 4 x Relay dry contact O/P (NC, C, NO), 5A, Programmable timer for  bell O/P or lamp on/off control

(5) Music O/P for school, church, max 7 music (max. length 30 seconds) can be stored. (user may provide *.wav for their preference).

Time Zone & DST adjustment : equipped.

For Ethernet card equipped master clock, all the setting can be done on web base.

4). GPS Receiver

MR-350 GPS Receiver

                                  Extension cable                                                 Mounting hardware

Features

MR350 GPS receiver is designed with 100% water proof，utilizing SiRF starⅢ IC chip. Suitable for varies outdoor activity use. Its features shows below:

1.SiRF Star III high efficacy GPS IC chips
2. High Sensitivity

3. Fast response
4. Support  NMEA0183 communication protocol
5. Internal memory equipped for data storage
6. Built-in ceramic antenna
7.RS232 interface
8.100% water proof
9. suitable for timing, location retrvie
10. WAAS ENGOS is supported.

Specifications

IC chips：

 SiRF Star III
Frequency：

 L1, 1575.42 MHz
C/A code：

 1.023 MHz chip rate
Channels：

 20
Sensitivity：

 -159 dBm
Accuracy:

  
Position：

 10 meters, 2D RMS
Speed：

 0.1 m/s
Time difference：

 1uS
Position data:

 default WGS-84
Reception time:

  
Receiver：

 Ave. 0.1 sec
Hot start up：

 Ave. 8 sec
Warm start up：

 Ave 38 sec
Cold start up：

 Ave. 42sec
Altitude：

 18,000 meters
Speed

 515 m/sec max
Shaking：

 20m/sec × 3
Power

  
Input power：

 4.5V ~ 6.5V DC input
Consuming current：

 70mA
Protocol:

  
Input power：

 4.5V ~ 6.5V DC input
Consuming current：

 70mA
Format：

 NMEA 0183 GGA, GSA, GSV, RMC, VTG, GLL
Size：

 62mm diameter, 21mm height
Length of signal cable：

 4.5 meters, extension cable max.40 meters upon request
Operating temperature：

 -0°C to +65°C

5). Digits slave clocks

Wall mount (single side) or ceiling mount(double side)

Specifications:

 

1.LED digit height :4” or 2”, 6 digits or 4 digits, Color: RED

2.Time accuracy: ±3sec per day（25℃ off line）。

3.Synchronized to Master clock wired or wireless, Keep on running when off line，synchronization time <2 seconds when recovered.。

4.12/24 hours format selectable, LED brightness adjustable according to environments.

5.When power failure，LED blanked, internal clock still working。

6.Humidity：10~90%

7.Temperature：0℃ to +50℃。

8.aluminum case with non-glare acryl-face。

I/P power：AC90~240V full range，50 / 60HZ。

Calendar clock

   Model: MAS-1A

Dimensions: 450mm(W) x 550mm(H) x 80mm(D)

Showing Calendar data (weekday/day/month/year) in abbreviations

4 digit clock (hour/minute), second circle with ZigBee transceiver, antenna (140mmH), or wired RS422 transmission

Wall hanger attached to the case.

LED:  Y/M/D, Weekday=2”, H/M=2.6”(6.6cm), Sec circle diameter=250mm

12H or 24H selectable

Synchronization indicator by colon

Brightness control by infrared keypads

Can be use as Master/slave operation or stand-alone

Power supply:  External AC adaptor I/P 100~240VAC O/P: 15VDC/4A

Large calendar clock

Model: MAS-3

Showing Calendar data (year/month/day &week day in abbreviations

4 digit clock (hour/minute), second circle with ZigBee transceiver, antenna (140mmH),

Wall hanger attached to the aluminum case.

Dimensions: 730mm(W) x 730mm(H) x 65mm(D)

LED:  Y/M/D, Weekday=2”, H/M=5”(13cm), Sec circle diameter=510mm

12H or 24H selectable

Synchronization indicator by colon

Brightness control by infrared keypads

Can be use as Master/slave operation or stand-alone

Music sound for each right hour can be programmable.

Power supply:  External AC adaptor I/P 100~240VAC O/P: 15VDC/4A