The Wharton 4850 synchronised master clock provides a precise GPS system time synchronisation
solution for computer network, CCTV, security, voice recording,
industrial process control and CCC applications in addition to
it's use in digital clock systems to control 400A series digital clocks, calendar clocks
and time zone clocks displaying time or time and date in up to
15 different global time zones.
The 4850 master clock may be synchronized from GPS, MSF or DCF radio
time signals and is designed for simple installation and 'setup
and forget' operation.
The 4850 master clock has a 14mm (0.6") high, bright
red six digit display of time, date or status
information which is visible at distances of up
to 7m (20ft). The time display can be user configured
to show either local or UTC time.
Serial ASCII RS232 & RS485 output
The 4850 time reference has a single RS232+RS485 user configurable
serial ASCII data port with a wide range of data
and message formats available at programmable
intervals or on request.
w482® time code output
This output provides a time code to drive up to 50
400A series clocks, calendar clocks and time-zone
clocks displaying time or time and date in up
to 15 different global time zones.
A precision one pulse per second signal of 100mS
duration is available at RS232 levels. The leading
edge of the signal is within 100uS of UTC when
locked to GPS.
A user configurable voltage-free, change-over relay
contact pair rated at 500mA @30v dc is available
and may be used to provide status information
or a periodic signal at user selectable intervals
between every 5 seconds to once per day at a user
Optional IRIG timecode output
4850.x.I versions have a 1KHz amplitude
modulated 3v p-p, 600 ohm transformer coupled
code output user configurable for IRIG-B, Afnor
87-500, NENA 911 or IEEE 1344 formats.
Optional EBU timecode output
4850.x.E versions provide EBU longitudinal
time code (LTC) at 2000bps with 25 complete frame
messages per second via a balanced output.
The 4850.R series master clock is housed in a 1U high
rack mounting case suitable for either free standing
or rack mounting applications. The 4850.T version
is housed in a small free standing case.
4850.R units have an internal switch mode power supply
and will operate from a 100-250v 50/60Hz ac supply.
The 4850.T version is supplied with the appropriate
'plug-top' style power supply for mains operation
at the specified location and may also be powered
from a 12v dc power source. The operational location
and local voltage should be specified at time
of order to ensure that the unit is supplied with
the appropriate mains connection.
timekeeping & synchronisation
The 4850 master clock will operate either
as stand-alone units or synchronised from external
When used in stand-alone configuration the clock
maintains time keeping from a high stability internal
crystal oscillator. The clock is pre-programmed
for leap-years and can be user programmed for
the required automatic seasonal time-change.
DCF & MSF radio time codes (requires
484 series radio time code receiver)
GPS satellite time signals (requires
488GPS time synchronisation sub-system)
RS232 & RS485
The RS232+RS485 serial interface can be
configured for many different pre-programmed data
message formats for specific CCTV, security and
embedded equipment time synchronization.
Message repetition rates
Non-specific message formats are user selectable for
transmission every second, every minute, every
five minutes, every hour, every day or on request.
Message data rate & format
The data rate and format of non-specific messages
may be set for 1200, 2400, 4800, 9600 or 19200
baud, 7 or 8 data bits and even, odd or no parity.
Standard message formats
The following standard message formats are pre-programmed
into the 4850 series master clock in addition to four specific
Wharton formats. Where referenced please refer to the
appropriate application note. If the data rate, format
and repetition rate are pre-defined by the application
these parameters are pre-set.
If you have any queries regarding the suitability of
the 4850 series master clock for your application
or have an application not covered by the following
list please contact our engineers.
Adder Digital Technology
ADT Site Guard - application
ASC Telecom DL2 - application
ASC Telecom Marathon -
application note AN136
Baxall DTL 960 - application
Coe - application note
Dedicated Micros Digital Sprite, Sprite2,
Philips/Bosch Allegiant LTC8300, 8511C, 8610/00, 8719A,
8810/00, 8910/00 series
Philips/Bosch Burle TC8286 & TC8288
Philips/Bosch Divar - application
Racal ICR64 & EBCDIC ICR64
Scientific Atlanta / CSI -
application note AN111
Sony HSR1 / 1P / 2 / 2P -
application note AN135
Serial reference clock for standard NTP distribution
- application note
Synectics - application
Tecton Darlex - application
Tecton Drax - application
Tecton Kramplex - application
Tecton Rugby Clock Interface
Tower Access Control
Ultrak Maxpro - Max1000
Vicon VPS - application
Vision Factory Cameo -
application note AN117
Vision Factory Cameo D1 -
application note AN138
Vision Factory Montage -
application note AN115
Vision Factory Montage+ -
application note AN116
Vision Research Company - Krammer 4 -
application note AN102
The 4850.R master clock has an internal PSU and will
operate from a 100-250v 50/60Hz ac supply. The
4850.T version is supplied with a 'plug-top' PSU
suitable for the operational location. The power
consumption is ‹0.4A @230v.
› 100 hours.
0% to 95% non condensing
Stand-alone operation: 0.1 sec/day
Synchronised to MSF or DCF: within
30mS of UTC
Synchronised to GPS: within 100uS
The 4850 master clock, comply with the European Community Electromagnetic
Compatibility Directive 89/336/EEC (as amended by 91/263/EEC, 92/31/EEC
and 93/68/EEC) and Low Voltage Directive 73/23/EEC (as amended by
93/68/EEC), when installed and used in accordance with our recommendations.
They conform to the following international standards:
output interface option
.R = 19" rack mounting
.T = table top
.S =standard = none
.I = IRIG time code
.E = EBU time code
.AU = Australian 240v 50Hz
.EU = European 230v 50Hz
.UK = UK style 230v 50Hz
.US = US style 110v 60Hz
MSF and DCF radio time code receivers - high performance
omni-directional receivers for protected external
484.02 MSF receiver
484.03 DCF receiver
Unidirectional receivers with rotating bracket
for internal use:
484.06 MSF receiver
484.07 DCF receiver
GPS time synchronisation sub-system. Comprises active
GPS antenna with post mounting bracket, 12 channel
receiver/decoder unit and interconnecting cables.
8 way RS232 buffer unit. Housed in 1U high rack mounting
bi-directional RS232 to RS485 converter. Mini plastic
If you have a special master clock or
ethernettime reference or time synchronisation requirement that is not
covered by our standard range of products please do not hesitate
to contact our technical department.
Copyright 2012 Wharton Electronics Limited. All
Synchronised Master Clock for GPS system time synchronisation