WHARTON 4860 User manual

4850 / 4860 Master Clock
Operating and Installation Instructions
Issue 2.0
Wharton

Issue 2.0
4850 / 4860 Master Clock
Operating and Installation Instructions
© 1999-2006 Wharton Electronics Ltd, All rights reserved.
In the interests of improving design, operational function, and/
or reliability, Wharton Electronics Ltd reserves the right to
make changes to the products described in this document
without notice.
Trademarks
Wharton Electronics, 4850, 4860, 4860net, net482, 400A and
w482 are trademarks of Wharton Electronics Ltd.
Mobaline is a registered trademark of Moser Baer AG.
Microsoft, Windows and Windows NT are registered
trademarks of Microsoft Corporation.
All other trademarks and registered trademarks are property
of their respective owners.
Customer Support
For assistance with installation, configuration or operation of
your 4850 / 4860 system, please contact your vendor’s
representative.
For further technical information and support for your 4850 /
4860, or any other Wharton product, please visit the Wharton
Electronics’s World Wide Web site:
http://www.wharton.co.uk
Statutory Notices
Warning - To prevent fire or shock hazard, do not
expose the unit to rain or moisture.
4850 versions only
This equipment has a built-in rechargeable Nickel Metal
Hydride (NiMh) battery, which should only be replaced by
qualified personnel.
Nickel Metal Hydride battery, dispose of properly.
You can return your unwanted Nickel Metal Hydride batteries
to the manufacturer or their agent.
Note: In some areas disposal of Nickel Metal Hydride batteries
in household or business trash may be prohibited.
Caution: Do not handle damaged or leaking Nickel Metal
Hydride batteries.
4860 versions only
This equipment has a built-in Lithium battery which in normal
operation should have a service life greater than 10 years. The
Lithium battery should only be changed by a suitably qualified
engineer.
CAUTION
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type
recommended by the manufacturer. Dispose of used
batteries according to the manufacturer’s instructions.
You can return your unwanted Lithium batteries to the
manufacturer or their agent.
Note: In some areas disposal of Lithium batteries in household
or business trash may be prohibited.
Caution: Do not handle damaged or leaking Lithium batteries.
For Customers in Europe
Electromagnetic Compatibility & Safety
The 4850 / 4860 Master Clock, when used in accordance with
our recommendations, complies with the European Community
Electromagnetic Compatibility Directive 89/336/EEC and Low
Voltage Directive 73/23/EEC and conforms to the following
standards:
•EN 50081-1 55022 class B
•EN 50082-1 IEC 801-2 level 3
IEC 801-3 level 3
IEC 801-4 level 3
•EN 60950
For Customers in the USA
The equipment has been tested and certified to comply with
the limits for a Class B digital device, pursuant to Part 15 of the
FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential
installation. The equipment generates, uses and can radiate
radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful
interference to radio communications. However, there is no
guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference
to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try
and correct the interference by one or more of the following
measures:
•Reorientate or relocate the receiving antenna.
•Increase the separation between the equipment and
receiver.
•Connect the equipment into an outlet on a circuit
different from that to which the receiver is connected.
•Consult the dealer or an experienced radio/TV technician
for help.
You are cautioned that any changes or modifications not
expressly approved in this manual could void your authority to
operate this equipment.
Warranty
The 4850 / 4860 Master Clock is fully guaranteed, on a return to
works basis, against failure due to faulty parts or workmanship
for two years from date of purchase. In the event of failure,
either within or outside the warranty period, please pack the
unit with care and return to the manufacturer, or their agent,
for examination and repair.
In no event shall the manufacturer, or their agent, be liable for
any direct, incidental or consequential damages of any nature, or
losses or expenses resulting from any defective product or the
use of any product, irrespective of whether the manufacturer, or
their agent, has advance notice of the possibility of such
damages.
Manual revision
This manual version 2.0 applies to VA software version 05.01
and later, unless otherwise specified.

4850 / 4860 Master Clock
Operating and Installation Instructions
Issue 2.0
Contents
1 Introduction
Features 1-1
Package Contents 1-1
2 Quick Start and 4850 / 4860 Programming
Quick Start 1-4 2-1
Quick Start 5-8 2-2
Frequently Asked Questions 2-3
4850 / 4860 Programming 2-4
Programming menus 2-4
Setting the time and date 2-6
Leap second insertion 2-7
Status display 2-7
System set-up 2-8
3 Installation
4 Location Setup
City / Location Table 4-2
5 Synchronisation Setup
GPS Synchronisation 5-1
MSF and DCF Synchronisation 5-3
6 w482 Time Zone Setup
7 Serial Setup
Serial Messages Table 7-2
8 Relay Setup
Relay Modes Table 8-1
9 Network Setup
Operation & Quick Setup 9-1
TCP/IP Concepts 9-1
Supported Protocols 9-3
10 IRIG Setup
IRIG Format Table 10-1
11 EBU Setup
EBU Format Table 11-1
12 Impulse Setup
Operation and Quick setup 12-1
A Cable specifications
B Case dimensions
C Supported devices
D NTP Synchronisation Option

Issue 2.0
4850 / 4860 Master Clock
Operating and Installation Instructions
1-1
Package Contents
The product package should contain the following items:
1 4850 / 4860 Master Clock.
2 IEC Mains lead (4850.R and 4860) or AC power adapter
(4850.T). (Either UK, EU, US or AU style depending on
order code)
3 9-pin RS-232 serial cable.
4 This manual.
5 4850 / 4860 software CD-ROM.
6 RJ45 patch lead ( 486xnet only)
For systems supplied with GPS receiver:
6 GPS antenna / receiver module.
7 25 metres of 4 core cable
or systems suppled with MSF or DCF radio receiver.
6 484.02 / 484.06 MSF or 484.03 / 484.07 DCF
radio receiver with 5 metres of cable.
1 - Introduction
The 4850 / 4860 Systems Master Clock provides the time
synchronisation solution for complete systems of equipment,
including computer networks, CCTV security, voice recording,
industrial process control and CCC applications. Available as
standard with MSF, DCF and GPS input synchronisation options,
optionally the 4860 can be supplied to synchronise from an
NTP time source or from IRIG-B time code. This flexibility
allows the 4850 / 4860 to be used as a universal solution for
providing time synchronisation to many different devices.
Features
•Operational
High visibility 6 digit display.
Display and timecode output messages can be
referenced to UTC or ‘Local’ time.
‘Set Once’ local time zone setup, automatically
calculating future time zone changes for local time
zone.
256 Year Calendar, 4 digit year setting. (Range 2000-
2255)
Easy to install, ‘setup and forget’ operation.
• Timing accuracy
Integrated TCXO module standard on 4860 versions.
Unsynchronised: 0.1sec/day @ 0-45ºC (20-25 ºC on
4850)
Locked to MSF or DCF: within 30mS of UTC
Locked to GPS: within 50uS of UTC (100uS on 4850)
• Network Timing Accuracy (4860net only)
Clients typically synchronised within 1-10 milliseconds
of 4860net timebase depending on network delay and
jitter. (NTP)
• RS232 and RS485/422 interface
One, two (4860.S2 versions only) or four (4860.S4
versions only) RS232 and RS485 serial outputs.
71 preset data formats for specific CCTV and
embedded equipment. Output interval programmable
for every second, every minute, 5 minutes, every hour,
every day or on request.
User selection of 1200, 2400, 4800, 9600 or 19200
baud, 7 or 8 data bits and odd, even or no parity on
nonspecific message formats
• Relay
30v dc. @ 500mA rated change-over contacts
0.1 second programmable contact change-over to
occur; every 5 seconds; every minute; every hour; once
per day at a user programmable time; on power
failure; whilst locked to an external time reference and
during an error state.
• w482 interface
Supports up to 50 400A series digital clocks and time
zone displays.
‘Set Once’ time zone setup, automatically calculating
future seasonal time changes for 15 time zones.
The 4860net Master Clock is supplied fitted with a 10Base-T
Ethernet interface to allow it to act as a time server on a TCP/IP
network. The 4860net interface supports the following
protocols:
• NTP and SNTP
Network Time Protocol (NTP) v2, v3 and v4 clients are
supported. (RFC1305 & RFC1119)
Simple Network Time Protocol (SNTP) v3 and v4 clients
are supported. (RFC2030 & RFC1769)
• TIME Protocol
TIME protocol (RFC868) is supported in UDP mode.
Additional outputs present on 4861x and 4850.x.I versions
• IRIG interface
1KHz amplitude modulated 3v p-p, 600Ωtransformer
coupled output.
RS485 level output. (RS485 interface can either be used
for serial or IRIG data)
Output formats: IRIG-B (B123), Afnor NFS 87-500,
NENA 911, IEEE 1344, MIC20
Additional outputs present on 4862x and 4850.x.E versions
• EBU interface
EBU longitudinal timecode (LTC) output, 2000 bps with
25 complete messages every second.
Balanced 600Ωand low impedance (not available on
4850.x.E) outputs.
Additional output interfaces present on 4860x.IMP versions
• Impulse outputs
Dual 24V alternate polarity impulse outputs rated at
200mA per channel.
Each output programmable for one second, half minute
or one minute alternate polarity impulses.
Fully protected output drive circuitry detects power
failure and short circuit line conditions which are
automatically corrected for on fault removal.
Environment
Power supply: 4850.R & 4860 - 110-240V AC 50/60Hz
4850.T - 12v DC via supplied external 110v or
230v AC PSU (specifiy required PSU at time of order)
Power consumption: < 0.4A @ 230V AC
Battery Backup: 4860 >1 Year.
4850 > 50 hours when fully charged.
(The battery backup maintains the internal time count during
periods of mains failure)
Enclosure: 4850.R & 4860 - 1u high 19” rack mount
483mm wide x 185mm deep x 44mm high (19” x 7.3” x 1.75”)
Weight: 2.8Kg
4850.T - Table top case
173mm wide x 178mm deep x 49mm high (6.8” x 7” x 2”)
Weight: 0.5Kg
Operating temperature: 0-50ºC
Relative Humidity: 0% to 90% (non-condensing.)
Altitude: 0 to 3,000m
MTBF: > 50,000 hours

4850 / 4860 Master Clock
Operating and Installation Instructions
Issue 2.0
2 - Connecting 488HS, 488B GPS and 484 series radio receivers
For 488HS and 488B GPS synchronisation see pages 5-1 and 5-2. For 484 radio synchronisation see pages 5-1 and 5-3.
3 - Connecting 400A and 470/474A slave displays
For details on synchronising 400A series clocks and time zone displays see pages 6-1 and 6-2.
4 - Connecting third-party equipment using RS232 or RS422/485
See sections 7 and appendix A of manual and application notes on 4850 / 4860 CD for further information.
2 - Quick Start, FAQ and 4850 / 4860 Programming
1 - Unpack 4850 / 4860 and check contents matches list on page 1-1.
2-1

Issue 2.0
4850 / 4860 Master Clock
Operating and Installation Instructions
2-2
5 - Connecting third-party equipment using EBU and IRIG.
For further information on connecting a 4862 / 4850.x.E Master Clock to other equipment using EBU timecode see pages 11-1 and 11-2.
For further information on connecting a 4861 / 4850.x.I Master Clock to other equipment using IRIG timecode see page 10-1.
8 - Apply power and set time on 4850 / 4860.
See page 3-1 for information on connecting the 4850 / 4860 to the mains power system. See pages 2-4, 2-5 and 2-6 for information on programming the time.
6 - Connecting the 4860net to an Ethernet network.
7 - Connecting Impulse slave clocks.
For further information on connecting a 4860net Master Clock to an Ethernet network see chapter 9.
For further information on connecting a 4860.IMP Master Clock to Impulse slave clocks see chapter 12.

4850 / 4860 Master Clock
Operating and Installation Instructions
Issue 2.0 2-3
Frequently Asked Questions
Will the 488HS / 488B GPS receiver system work
internally?
Both the 488HS and the 488B GPS receiver systems are
designed for external mounting. We would recommend
positioning the post-mounting 488HS GPS system on the roof
of the building with a clear view of at least 75% of the sky.
The post mounting antenna supplied with the 488B GPS
system should be mounted in a similar position. The decoder
box supplied with the 488B GPS system should be mounted
within 5 metres of this (either internally or externally).
Please refer to chapter 5 for further information.
Can I extend the cable supplied with the 488HS GPS
receiver system?
The system is supplied with 25 metres of four-core screened
cable for connection between the 488HS GPS system and the
4850 / 4860 master clock. This cable length may be increased
up to a maximum of 50 metres using a similar type of cable or
up to a maximum of 200 metres using a heavier gauge cable.
Please refer to chapter 5 and appendix A for further
information.
Can I extend the cables supplied with the 488B GPS
receiver system?
The 488B GPS receiver system is supplied with a 5 metre fixed
length of cable for connection between the post-mount
antenna and the decoder box. This cable length cannot be
adjusted.
The system is also supplied with 25 metres of four-core
screened cable for connection between the decoder box and
the 4850 / 4860 master clock. This cable length may be
increased up to a maximum of 50 metres using a similar type
of cable or up to a maximum of 200 metres using a heavier
gauge cable.
Please refer to chapter 5 and appendix A for further
information.
Why will the 4850 / 4860 master clock not synchronise
to the MSF or DCF radio time code signal?
Under normal circumstances the MSF signal provides reliable
operation at distances of up to 1000km from Rugby in the
United Kingdom. The DCF signal is normally usable up to
1500km from Frankfurt in Germany.
In good conditions the 4850 / 4860 master clock, when used
with a 484 series radio time code receiver should synchronise
to MSF or DCF within 3 minutes. During this period, the ‘code’
LED should flash once per second.
However, MSF and DCF suffer greatly from electromagnetic
interference which can cause the 4850 / 4860 master clock not
to synchronise. In this instance, the ‘code’ LED on the front
panel of the 4850 / 4860 may flash erratically. To minimise
interference problems, we would recommend mounting the
484 series radio time code receiver away from any computer or
electronic equipment, fluorescent lighting, lift equipment,
metal girders, reinforced concrete walls or any other sources of
electrical noise.
MSF is off-air for a maintenance period of two weeks during
the summer, and the first Tuesday of every January, April, July
and October. Please refer to page 5-3 for further information.
Will the 484 series radio time code receiver work
internally?
The 484.02 MSF and 484.03 DCF radio time code receivers are
suitable for either internal or protected external mounting. For
reliable operation, we would recommend mounting these units
externally if possible.
The 484.06 MSF and 484.07 DCF radio time code receivers are
suitable for internal use only.
Please refer to page 5-3 for further information.
Can I extend the cable to my 484 series radio time
code receiver?
The cable connection to a 484 series radio time code receiver
may be extended up to a maximum of 10m using a similar
specification cable. This connection may be extended up to a
maximum of 200 metres using a screened twisted pair cable
as specified in appendix A.
How can I tell if the 4850 / 4860 master clock has
synchronised to my chosen synchronisation time
source?
When the 4850 / 4860 master clock is synchronised, the ‘Lock’
LED will illuminate.
Why does the master clock not show the correct time,
even though the ‘lock’ LED is illuminated?
Check that the location is set correctly. Please refer to chapter
4 for further details.
How do I synchronise a CCTV device from the 4850 /
4860 master clock?
Appendix C lists the supported devices and any relevant
application note. The application notes detail how to connect
the 4850 / 4860 master clock to your chosen device and may be
found on the CD-ROM supplied.
How do I connect analogue impulse clocks to the
4860.IMP master clock?
Please refer to chapter 12 for details on impulse output setup.

Issue 2.0
4850 / 4860 Master Clock
Operating and Installation Instructions
2-4
4850 / 4860 Progamming
The 4850 / 4860 Master Clock has a user friendly interface
based on the use of four buttons.
The buttons are located to the right hand side of the display
and are labelled and .
The and buttons are used to step between and save
mode settings whereas the and buttons are used to
alter the values of settings.
On pressing the button the function mode is entered. By
pressing the and buttons the user can scroll through all
the available modes for set up of the 4850 / 4860.
The modes will be displayed in the following order:
Time Setting Mode
Location Setting Mode
Synchronisation Setting Mode
Network Setting Mode (visible on all 4860 versions -
usable on 486xnet versions only)
Zone Setting Mode
S1 Serial Output Setting Mode
S2 Serial Output Setting mode (4860.S2 & .S4 versions
only)
S3 Serial Output Setting mode (4860.S4 versions only)
S4 Serial Output Setting mode (4860.S4 versions only)
Relay Setting Mode
IRIG Setting Mode (visible on all versions - usable on
4861 and 4850.x.I versions only)
EBU Setting Mode (4862/4862net versions only)
Impulse Channel 1 Setting mode (.IMP versions only)
Impulse Channel 2 Setting mode (.IMP versions only)
System Setting Mode
To select any of the modes whilst they are displayed in the
function mode press the button. This allows the user to
enter a specific mode and make any necessary changes to the
related settings.
To progress through the options use the button and to alter
the values for these options use the and buttons. On
completion of any changes the and buttons can be
used to save the settings and to either step forward or
backward through any other options before returning to the
normal time display.
Continued on page 2-5
Programming menus
Normal time display
Function ‘Time Setting Mode’.
‘^’ to select, ‘+’ or ‘-’ to change.
Function ‘Location Setting Mode’.
‘^’ to select, ‘+’ or ‘-’ to change.
Function ‘Synchronisation Mode’.
‘^’ to select, ‘+’ or ‘-’ to change.
Function ‘Network Setting Mode’.
‘^’ to select, ‘+’ or ‘-’ to change.
Time Setting Mode selected, with
seconds flashing. See page 2-6.
Location Setting Mode selected,
with zone flashing. See page 4-1.
Synchronisation Mode selected.
See page 5-1.
Network Setting Mode selected, with
IP address flashing. See page 9-1.
‘Network Setting
Mode’ will appear
on all 4860
versions, but only
be usable on net
versions.

4850 / 4860 Master Clock
Operating and Installation Instructions
Issue 2.0 2-5
Function ‘Serial 1 Setting Mode’.
‘^’ to select, ‘+’ or ‘-’ to change.
Function ‘Relay Setting Mode’. ‘^’
to select, ‘+’ or ‘-’ to change.
Function ‘IRIG Setting Mode’. ‘^’ to
select, ‘+’ or ‘-’ to change.
Function ‘System Setup’. ‘^’ to
chang the system seeting.
Normal time display
Function ‘Zone Setting Mode’. ‘^’
to select, ‘+’ or ‘-’ to change.
Zone Setting Mode selected, with
location 2 flashing. See page 6-1.
Serial 1 Setting Mode selected,
with code flashing. See page 7-1.
Relay Setting Mode selected, with
setting flashing. See page 8-1.
IRIG Setting Mode selected, with
type flashing. See page 10-1.
Brightness Mode selected, with
brightness flashing. See page 2-8.
Programming menus cont.
Function ‘Serial 4 Setting Mode’.
‘^’ to select, ‘+’ or ‘-’ to change.
Serial 4 Setting Mode selected,
with code flashing. See page 7-1.
Function ‘EBU Setting Mode’. ‘^’ to
select, ‘+’ or ‘-’ to change.
EBU Setting Mode selected, with
type flashing. See page 11-1.
Function ‘Impulse channel 1 Setting
Mode’. ‘^’ to select, ‘+’ or ‘-’ to change.
Impulse channel 1 Setting Mode selected,
with status flashing. See page 12-1.
Function ‘Impulse channel 2 Setting
Mode’. ‘^’ to select, ‘+’ or ‘-’ to change.
Impulse channel 2 Setting Mode selected,
with status flashing. See page 12-1.
‘Serial 2 Setting
Mode’ will only
appear on 4860.S2
& .S4 versions.
‘Serial 3 Setting
Mode’ & ‘Serial 4
Setting Mode’ will
only appear on
4860.S4 versions.
‘Impulse Channel
1 Setting Mode’ &
‘Impulse Channel
2 Setting Mode’
will only appear
on 4860.IMP
versions.
‘EBU Setting
Mode’ will only
appear on 4862
and 4850.x.E
versions.
‘IRIG Setting
Mode’ will appear
on all versions, but
only be usable on
4861 and 4850.x.I
versions.

Issue 2.0
4850 / 4860 Master Clock
Operating and Installation Instructions
2-6
Setting the Time
A detailed diagram with full instructions on manually setting
the time and date is shown below.
Normal time display
Time setting mode selected, with
seconds flashing.
Time setting mode selected, with
minutes flashing.
Time setting mode selected, with
hours flashing.
Time setting mode selected, with
year flashing.
Time setting mode selected, with
month flashing.
Time setting mode selected, with
day flashing.
Time setting mode selected, with
leap second flashing.
Normal time display
Function ‘Time Setting Mode’.
Press ‘^’ to select.
‘+’ increments the seconds count, ‘-’ holds
the seconds count at the current value.
‘+’ and ‘-’ change the minutes
value.
‘+’ and ‘-’ change the hours value.
‘+’ and ‘-’ change the years value.
‘+’ and ‘-’ changes the month
value.
‘+’ and ‘-’ changes the day value.
‘+’ and ‘-’ changes the leap
second value. Please refer to
page 2-7 for further information.

4850 / 4860 Master Clock
Operating and Installation Instructions
Issue 2.0 2-7
Leap Second Insertion
The 4850 / 4860 can be programmed to allow for leap second
insertion (one second is sometimes added at the end of March,
June, September or December), to compensate for the
deceleration of the Earth’s rotational time with respect to the
the Atomic clock (UTC).
This function is enabled by programming the ‘LS’ setting to yes
(as shown on page 2-6).
Date, Sychronisation, Impulse Time and
temperature Status Displays
When in normal time display mode the plus and minus buttons
can be used to cycle through the date, synchronisation, impulse
time (4860.IMP only) and temperature (4860 only) status
displays. When any of these displays is selected the 4850 /
4860 will return to normal time display mode after 2 minutes.
The Synchronisation status display provides useful information
regarding the current quality of the MSF or DCF signals that
are being received by a 484 series radio receiver.
The two Impulse time displays indicate the Impulse time of
both Impulse channels. Please refer to chapter 12 for further
information.
The Temperature status display shows the internal
temperature of the 4860 Master Clock.
Synchronisation Status Display
The synchronisation status display provides the following
information relating to MSF or DCF signal reception.
Impulse time
screens will only
appear on
4860.IMP versions.
Temperature
status screen will
only appear on
4860 versions.
Normal time display
Synchronisation status display.
Date display.
Normal time display
Indicates the number of seconds of the
current time message that have been
received. ‘Aq’ indicates that the 4850 /
4860 is trying to acquire the first second
of a new time message.
Indicates the number of valid time
messages received. Incremented for
every good message decremented for
every corrupt message. (Range 0-F)
The number of minutes before the 4850
/ 4860 declares that it has lost lock to
the input signal. (Range 0-F)
The synchronisation lockout counter, the
number of minutes of valid, but
different time messages required
before the 4860 / 4850 will synchronise
to the new time. (Range 0 - 9)
Temperature status display.
Impulse channel 1 time display.
Impulse channel 2 time display.

Issue 2.0
4850 / 4860 Master Clock
Operating and Installation Instructions
2-8
System Set-up
The system set-up menu contains general set-up options for
the 4850 / 4860 Master Clock. The table below details the
available options.
w482 Timecode output
As shown in the table above, the w482 timecode output port
may be set to output either w482 timecode or unmodulated
MSF, DCF or HBG timecodes. The MSF, DCF & HBG outputs may
be set to pulse high or low as required (MSF, DCF & HBG pulse
high, -MSF, -DCF & -HBG pulse low). The L48 option
implements longer w482 code pulse lengths for use with older
400 series digital clocks. The S48 option implements shorter
than standard w482 code pulse lengths.
Normal time display
Function ‘System Setting Mode’.
Press ‘^’ to select.
Function ‘Time Setting Mode’.
Press ‘+’ eight times to move to
system setting mode.
Normal time display
Brightness setting mode, with
brightness flashing. Use ‘+’ and ‘-’
to alter brightness and ‘^’ to store.
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w482 timecode output setting mode,
with w482 flashing. Use ‘+’ and ‘-’ to
alter output type and ‘^’ to store.
4850 / 4860 software version. Press
‘^’ to continue.
Network software version
(disabled in this software
revision). Press ‘^’ to continue.
Factory use only. Press ‘^’ to
continue.
If your 4850 /
4860 is fitted
with NTP,
EBU, S2, S4
or .IMP
options, you
may need to
press the ‘+’
switch more
than 8 times.

4850 / 4860 Master Clock
Operating and Installation Instructions
Issue 2.0
Warning - dangerous voltages - the 4850 / 4860
master clock must be disconnected from the mains
supply prior to removing the top cover.
Power Supply Connection
The 4850.R and 4860 master clocks are fitted with universal
power supplies suitable for 110v - 240v ac operation. The
4850.T may be supplied for 230v AC, 110vAC or 12v DC
operation. Please specify appropriate end user location at
time of order to enable correct power adapter or connector
type to be supplied.
PSU order codes:
.AU - Australian style, 240v 50Hz ac.
.EU - European style, 230v 50Hz ac.
.UK - UK style, 230v 50Hz ac.
.US - US style, 110v 60Hz ac.
The 4850.R / 4860 master clock is supplied with an IEC style
mains lead.
The 4850.T is supplied with an external 12v DC power supply.
If an alternative PSU is to be used, it should have a rating of
greater than 0.4A at 12v DC.
The master clock must be connected to the appropriate supply
after first verifying the correct voltage by reference to the
supply voltage label fixed to the rear of the clock (4850.R /
4860) or on the external power supply (4850.T).
A connection to the earth line must be made to ensure safe
operation and ensure compliance with EMC regulations.
To ensure conformance with EN60950:
(A) For installations where the 4850 / 4860 master clock
is to be permanently connected into the mains
power circuit, a readily accessible disconnect device
should be incorporated in the fixed wiring.
(B) For installations where the 4850 / 4860 master clock
is to be plugged into the mains power circuit, a
socketed outlet should be installed near the
equipment and should be easily accessible.
All installation work should be performed in accordance
with the Sixteenth Edition of the IEE Wiring Regulations.
Battery backup.
The 4860 is fitted with a Lithium battery which will maintain
the internal time count for a period normally in excess of 1 year
if the mains supply is interrupted.
The 4850 is fitted with an automatically recharging battery
which will, when fully charged, maintain the internal time
count for a period in excess of 50 hours if the mains supply is
interrupted.
Fuses and Output protection.
The 4850 / 4860 makes use of advanced automatically
resettable fuse technology so that it is protected under fault
conditions.
The universal power supply within the 4850 / 4860 uses a
20mm fuse rated at 2 Amps 250V. Please note that this fuse is
not a user serviceable part.
External Connections
The external connections located on the rear of the 4850 / 4860
provide the following inputs and outputs:
Connection Section
GPS / Synchronisation Connection 5
Relay Connection 8
IRIG* and EBU* Connection 10 & 11
RS232 and RS422/485 S1, S2*, S3* & S4* 7
Connections
w482 Connection 6
10BaseT Ethernet* Connection 9
Impulse Connection* 12
* denotes optional items which may or may not be fitted in your
unit.
Please see the relevant sections of this manual for further
information.
Operation
Please see section 2 for a quick start guide to getting your
4850 / 4860 system up and running.
3-1
4850.T.x.x
3 - Installation
4850.R.x.x
486x.x.x

Issue 2.0
4850 / 4860 Master Clock
Operating and Installation Instructions
4 - Location Setup
The 4850 / 4860 Master Clock provides advanced time zone
functionality. Regardless of time synchronisation source, the
4850 / 4860 can be used to provide time and date information
referenced to UTC, user ‘local’ time or other custom time zone.
Incorporating ‘Set Once’ technology, the 4850 / 4860 will
automatically calculate future seasonal time changes for all 64
of the preset time location code settings.
Setting the location
For installations where the output of the 4850 / 4860 is to be
referenced to UTC / GMT, the location code should be set to 00.
For installations where the output of the 4850 / 4860 is to be
referenced to the ‘local’ time zone, select the appropriate
location code from the table opposite. (eg. For a unit installed
in Birmingham, England, where ‘local’ time output is required,
location code 01 should be used.)
User Programmable Time Zone
For time-offsets and daylight saving time change dates not
covered by the location codes on page 4-2, a user
programmable time zone is provided. Information regarding
the time offset from UTC and any daylight saving change rules
may be input via a 12 digit code.
Please contact our technical department for further information
regarding this function.
4-1
Normal time display
Function ‘Time Setting Mode’. Press ‘+’
to move to ‘Location Setting Mode’.
Function ‘Location Setting Mode’. Press
‘^’ to select.
‘Location Setting Mode’ selected, with
current location flashing. Use ‘+’ and
‘-’ to select the required location from
the table on page 4-2.
Press ‘^’ to store the new location
setting and return to normal time
display.
Normal time display.

4850 / 4860 Master Clock
Operating and Installation Instructions
Issue 2.0 4-2
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Issue 2.0
4850 / 4860 Master Clock
Operating and Installation Instructions
GPS Synchronisation
The 488HS and 488B GPS receiver systems are designed to be
automatically synchronised to time signals transmitted from
the Global Positioning System (GPS) navigation network. The
GPS constellation consists of 28 operational satellites,
operating in 12 hour orbits at an altitude of 20,200km.
Both the 488HS and the 488B GPS receiver have been designed
for simple installation and operation by the end-user, requiring
only a 4 wire interconnection to the 4850 / 4860 Master Clock.
When synchronised to a 488HS or 488B GPS receiver system the
4860 Master Clock output signals are maintained within 50uS
of UTC (100uS of UTC on 4850 versions).
The reception gain pattern of both GPS systems is designed
for full, upper hemispherical coverage with the gain
diminishing at low elevations. This cross-section is consistent
through 360 degrees and so the 3 dimensional gain pattern is
a symmetrical spheroid surface.
Advantages of GPS time synchronisation:
• Very accurate synchronisation
• Can be used anywhere in the world
• Not subject to EM interference
Disadvantages of GPS time synchronisation:
• Antenna needs to be mounted externally with a clear
view of 75% of the sky.
The 488HS GPS Synchronisation System
The 488HS GPS synchronisation system is housed in a single
IP66 rated case containing an advanced combined Sony active
antenna and 12 channel parallel GPS receiver module and a
microprocessor based communications interface. The system
is supplied complete with a post mounting clamp to enable
the unit to be fixed to a suitable horizontal or vertical post of
up to 2cm diameter. The antenna should be mounted on the
roof of a building or under a suitable skylight.
The 488B GPS Synchronisation System
The 488B GPS receiver system comprises a post mounting
active antenna and a separate receiver/decoder unit. The
antenna module transmits the received GPS signals and
receives power (5Vdc @ 25mA) from the GPS receiver/decoder
module via a single 5 metre long RG58 coaxial cable. A post
mounting clamp is supplied to enable the antenna to be fixed to
a suitable horizontal or vertical post of up to 2cm diameter. The
antenna may be mounted on the roof of a building or under a
suitable skylight.
The GPS receiver/decoder unit contains a Motorola 8 Channel
parallel receiver and a microprocessor based communications
interface. The receiver/decoder module is housed in a robust
aluminium case fitted with mounting points for wall mounting
and protected to IP65. The module should be mounted in a
protected location within 5 metres of the antenna.
488HS and 488B System Installation
To ensure ease of operation and to remove the possibility of
operator error, both the 488HS and 488B GPS systems are
designed to self initialise.
Ensure that the 4850 / 4860 is disconnected from the
mains power supply when making connections to the
488HS / 488B GPS receiver systems.
1 Install the 488HS unit or 488B antenna module
horizontally using the post mounting kit provided.
Ensure that the unit has a clear view of at least 75% of
the sky. If the sky view is reduced the interval between
‘switch-on’ and system time synchronisation will be
considerably increased.
2 Connect the antenna module to the GPS receiver using
the special 5m cable provided (488B systems only).
5-1
5 - Synchronisation Setup
GPS connection
10 way terminal block
- -ve Power for 488HS / 488B GPS
+ +ve Power for 488HS / 488B GPS
A Signal A from 488HS / 488B GPS
B Signal B from 488HS / 488B GPS
EMC grounding point
Note:
A Screened cable should be used to
connect the 488HS / 488B GPS receiver
to the 4850 / 4860. The screen should
be connected to the EMC grounding
point on the 4850 / 4860 and on the
488B GPS receiver.
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MSF and DCF connection
10 way terminal block
- Green or uncovered wire from
484 radio receiver.
+ Link to ‘A’ connector.
A Link to ‘+’ connector.
B Red or clear wire from 484
radio receiver.
EMC grounding point
Note:
A Screened cable should be used to
connect the 484 radio receiver to the
4850 / 4860 in areas of high electrical
noise. The screen should be
connected to the EMC grounding
point on 4850 / 4860 only.
uncovered clear
Green or
Wire link
AB
Red or
-+
GPS Receiver w482 Relay
A B no nc C
nc
Relay
+
GPS Receiver
- A B w482 ABno C

4850 / 4860 Master Clock
Operating and Installation Instructions
Issue 2.0 5-2
Lead
Antenna
plug-in terminal block
two part power/data
Internal antenna socket
ABCD
POWER
STATUS
B A + -
3 A connection between the 488HS / 488B and the 4850 /
4860 should be made using the 25 metre four core
cable supplied. If a longer cable distance is required
Appendix A should be consulted for suitable cable
specifications. The maximum distance between the
GPS system and the 4850 / 4860 master clock is 200m.
If a screened cable is used, the cable screen should be
connected to the EMC ground connection on the 10 way
terminal block, located on the rear of the 4850 / 4860.
On 488B systems, the screen should be connected to
the screw fitting on the 488B receiver/decoder case.
The screen is supplied pre-connected on 488HS units
with captive cable connections.
4 The 4 GPS input connections located on the 10 way
terminal block on the rear of the 4850 / 4860, should be
wired as shown in the diagram on page 5.1.
5 Connect the power supply to the 4850 / 4860 Master
Clock.
6 Once the power has been applied the receiver will
automatically begin to search the sky for all available
satellites, during this process the green LED will flash.
After three satellites have been acquired the green LED
will stop flashing and become constantly illuminated,
indicating that a precise date and time has been
calculated from the satellite data transmissions. From a
‘cold’ start this process will typically take less than 10
minutes.
7 Ensure that the 4850 / 4860 is configured to synchronise
from the GPS signal by following the procedure on
page 5-3.
Once the green LED has illuminated the synchronising time
signals are transmitted from the GPS system to the 4850 /
4860. The 4850 / 4860 Master Clock should lock in and display
the correct time within 5 minutes.
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488B Receiver decoder unit.
Housed in IP65 case, suitable for mounting
in a sheltered external location.
5 metre cable
(cannot be extended)
488B Antenna
Should be mounted with a
view of at least 75% of the
sky.
20mm dia. post
(not supplied)
Both the 488HS and the 488B GPS Receiver systems are
supplied with 25 metres of 4 core cable. Cable distance can
be extended up to a maximum distance of 200 metres using
the cable specifications detailed in appendix A.
20mm dia. post
(not supplied)
488HS GPS Receiver
Should be mounted with a
view of at least 75% of the
sky.
488HS GPS Receiver System
488B GPS Decoder
25metre captive
cable for connection
to 4850 / 4860
Master Clock.

Issue 2.0
4850 / 4860 Master Clock
Operating and Installation Instructions
5-3
MSF and DCF synchronisation
MSF and DCF are the two most widely used radio time code
signals. The DCF signal is derived from the atomic clocks at the
Physics Institute of Brunswick and transmitted at a frequency
of 77.5KHz from Manflingen, near Frankfurt in Germany. The
MSF signal is referenced to the Caesium Beam Oscillators at
the National Physical Laboratory and transmitted on a
frequency of 60KHz from Rugby in the United Kingdom.
Under normal circumstances the DCF signal provides reliable
operation at distances of up to 1500km, MSF signals are
normally usable up to 1000km from the transmitter. Greater
operating ranges are possible at night.
When synchronised to MSF or DCF using a 484 radio receiver
the 4850 / 4860 Master Clock output signals are maintained
within 30mS of UTC.
Advantages of MSF and DCF time synchronisation:
• Lower purchase cost than GPS
• Can sometimes be installed internally.
Disadvantages of MSF and DCF time synchronisation:
• Can be difficult to find good location for signal
reception.
• Suffers greatly from EM interference - Avoid locating
near computers, electronic equipment, fluorescent
lighting, lift equipment, metal girders, reinforced
concrete walls and all other sources of electrical noise.
• MSF is off-air for a maintenance period of two weeks
during the summer, and the first Tuesday of every
January, April, July and October. MSF status can be
checked by telephoning 020 8943 6493.
Installation
The 484 series time code receiver should be mounted:
• At least 2.5 metres from the 4850 / 4860 Master Clock.
• At greatest practical distance from:
Other electronic equipment including computers,
fluorescent lights and signs, metal girders, reinforced
concrete walls and any other sources of electrical noise.
• On the side of the building nearest Rugby (MSF) or
Frankfurt (DCF).
• Preferably on the outside of the building (484.02 and
484.03 only) as high as possible. The case is
weatherproof to IP65 (484.02 and 484.03 only) but it is
preferable to provide some protection from direct rain.
• With the cable entry on the lower face of the case.
(484.02 and 484.03 only)
The antenna is supplied with 5 metres of two core cable, if a
longer cable distance is required Appendix A should be consulted
for suitable cable specifications. The maximum distance
between the 484 radio receiver and the 4850 / 4860 Master
Clock is 200m.
If a screened cable is used, the cable screen should be connected
to the EMC grounding terminal on the 10 way terminal block,
located on the rear of the 4850 / 4860.
Alignment
The 484.02 (MSF) and 484.03 (DCF) radio receivers have dual
ferrite antennas, which normally permit location regardless of
orientation to the transmitter. The receiver is mounted by means
of four fixing holes in the rear surface which are accessed after
removing the front cover. The four mounting holes are located
outside of the central sealed compartment.
The 484.06 (MSF) and 484.07 (DCF) receivers have a single
antenna element and are supplied with an adjustable
mounting bracket so that the installer can ensure that the
orientation of the longest face of the receiver is at 90oto the
direction of the transmitter.
The front cover of the 484.02 and 484.03 receivers may be
removed to enable the indicator LED to be viewed. The indicator
LED on the 484.06 and 484.07 receiver is located on the front
face of the unit.
The alignment of the receiver is correct when the LED flashes
once per second. The Code LED located on the front of the
4850 / 4860 will flash at the same time as the LED in the 484.
Signal reception
In good conditions the 4850 / 4860 master clock will take three
minutes to synchronise with the transmitted time code from
either DCF or MSF. When the 4850 / 4860 is ‘locked’ to the
transmitted signal, the locked LED, located after the seconds
display, is illuminated continuously. During periods of signal
failure or signal corruption the clock will maintain timekeeping
using its internal crystal oscillator.
1 PPS / Serial ASCII Synchronisation
Special order versions of the 4860 Master Clock are available
to facilitate synchronisation with an RS232 / RS485 level serial
ASCII data string or timebase generation from an RS232 /
RS485 level 1 Pulse Per Second source. The Serial variant will
synchronise to Wharton format 1 (as shown on page 7.1)
transmitted at 9600 baud, 8 data bits, no parity, 1 stop bit at a
1 second repetition rate.
Normal time display
Function ‘Time Setting Mode’. Press ‘+’
twice to move to synchronisation mode.
Function ‘Synchronisation Mode’. Press
‘^’ to select.
Synchronisation mode selected with
current mode flashing. Use ‘+’ and ‘-’
to select required setting.
Press ‘^’ to save synchronisation mode
and return to normal time display.
Normal time display.

4850 / 4860 Master Clock
Operating and Installation Instructions
Issue 2.0
The w482®signal was developed for controlling electronic
clocks, using a single cable pair data interconnection, in
electrically noisy environments. A principal advantage of
w482® is the ability to provide time information in any one of
fifteen different synchronised time zones. All fifteen time
zones can be individually configured from the front panel of
the 4850 / 4860, using ‘Set Once’ technology to allow automatic
seasonal time change correction.
The w482®signal is transmitted at 4-24v amplitude and at a
50 bits per second data rate. The signal is virtually immune to
electro-magnetic interference.
One 4850 / 4860 unit can control up to fifty 400A series slave
displays located up to 1km from the master clock unit using a
simple, non-critical cable pair.
Setup Procedure
1 Decide what time you want to display on your slave
clocks. If you just want to display Local Time, as
previously programmed during ‘location’ setting (section
4), proceed to stage 2.
If you have more than one time zone to display or want
to display a different time zone from that set in the
location setting, determine the zone location codes
(Page 4-2) and program w482 zones ‘2’ - ‘A’ accordingly.
Ensure that the 4850 / 4860 system is disconnected
from the mains power supply when making
connections to the w482 output.
2 Connect the 400A slave clocks to the 4850 / 4860 w482
output terminals. (See above and page 6-2).
Check that the 400A (or 470A) slave clock is programmed
for w482 time code synchronisation. If the 400A (or
470A) slave clock is to be synchronised by a w482 time
zone which is not zone 1, program the 400A (or 470A)
clock accordingly.
Refer to the 400A (or 470A) series operating and
installation manual for more details.
3 Apply power to the 4850 / 4860.
Note: If you using the IRIG output (4861 and 4850.x.I versions
only) or EBU output (4862 and 4850.x.E versions only) and are
using it in an application that requires the location setting to
be set to a time zone other than the local time zone, w482 zone
2 should be programmed for the local time zone and the slave
displays should be configured accordingly.
6 - w482 Time Zone Setup
4850 / 4860 w482 Code Output
10 way terminal block
A w482 Code +
B w482 Code -
EMC grounding point
Note:
Polarity of connection is not critical.
If a screened cable is used for system
interconnection, the screen should
only be connected to the EMC
grounding point on the 4850 / 4860.
6-1
Normal time display
Function ‘Time Setting Mode’. Press ‘+’
four times to move to w482 zone
setting mode.
Function ‘w482 Zone Setting Mode’.
Press ‘^’ to select.
w482 Zone Setting Mode, zone 2
selected with current location flashing.
Use ‘+’ and ‘-’ to change.
Press ‘^’ to store the new zone 2
setting and move on to the w482 time
zone 3 setting.
Zone 3 selected, press ‘+’ and ‘-’ to
change current setting, ‘^’ to move to
next zone.
w482 zone settings 4 - F
Zone F selected, press ‘+’ and ‘-’ to
change current setting, ‘^’ to return to
normal time display.
Normal time display.

Issue 2.0
4850 / 4860 Master Clock
Operating and Installation Instructions
Net Update
MAC Address xx xx xx xx xx xx
Data Link 10Base-T RS232/RS485 S2
GPS Receiver
A-+ B
IRIG-B
RS232/RS485 S1
nc
Relay
w482BAno C
RS232/RS485 S4RS232/RS485 S3
6-2
w482 time code system interconnection