Meinberg HSC509 User Manual
FUNKUHREN
Technical Information
Operating Instructions
HSC509
Impressum
Werner Meinberg
Auf der Landwehr 22
D-31812 Bad Pyrmont
Phone: ++49 52 81 - 9309-0
Fax: ++49 52 81 - 9309-30
Internet: http://www.meinberg.de
Email: info@meinberg.de
June 25, 2004
Table of Contents
Impressum ............................................................................................ 2
General Information about DCF77 ...................................................... 7
HSC509 ................................................................................................ 8
HSC509 Features ................................................................................. 8
LF Receiver ................................................................................ 9
Microprocessor System .............................................................. 9
LC Display.................................................................................. 9
Buffered Real Time Clock.......................................................... 9
Slave Clocck Pulses.................................................................... 9
Relay Outputs ........................................................................... 10
Serial Interfaces ........................................................................ 10
Outputs ............................................................................ 10
Inputs............................................................................... 10
Installation.......................................................................................... 11
Power Supply............................................................................ 11
Mounting the Antenna .............................................................. 11
Powering Up the System ..........................................................11
Operation............................................................................................ 12
MENU Key............................................................................... 12
CLR/ACK Key ......................................................................... 12
NEXT Key................................................................................ 12
INC Key.................................................................................... 12
INC Key together with CLR/ACK Key ................................... 12
The Menus in Detail........................................................................... 13
Root Menu ................................................................................ 13
Menu Day Plan ......................................................................... 14
Programming a Plan .................................................................14
Select a Plan..............................................................................14
Select a Switching Program......................................................15
Editing Holydays................................................................................17
Cyclic Pulses ...................................................................................... 18
Table of possible Pulse Periods ................................................ 18
Configuration............................................................................ 19
Clear Data .......................................................................................... 20
Clear RAM................................................................................20
Clear Plan ................................................................................. 20
Setting the Clock Manually................................................................21
Configuration Time Zone .................................................................. 21
Slave Clock Operation .......................................................................22
Display Slave Line Time .......................................................... 22
Set Slave Line Time/Slave Clocks ...........................................23
Setup Relay State ...............................................................................23
Firmware Updates .............................................................................. 24
Inquiring Serial Number and Software Revision............................... 24
Technical Specifications HSC509 ..................................................... 25
Rear Panel Connectors..............................................................25
CE Label ................................................................................... 25
Pin Assignment of the Phoenix MCD Connector.....................26
Technical Specifications ....................................................................27
Format of the Meinberg Standard Time String ........................ 29
Component Layout Main Board ............................................... 31
Component Layout Display Board ........................................... 33
Menu Quick Reference ...................................................................... 35
General Information about DCF77
The radio remote clocks made by Meinberg receive the signal from the long wave
transmitter DCF77. This long wave transmitter installed in Mainflingen near Frankfurt/Germany transmits the reference time of the Federal Republic of Germany. This
time reference is either the Central European Time (Mitteleuropäische Zeit, MEZ) or
the Central European Summer Time (Mitteleuropäische Sommerzeit, MESZ). The
transmitter is controlled by the atomic clock plant at the Federal Physical Technical
Institute (PTB) in Braunschweig/Germany and transmits the current time of day, date
of month and day of week in coded second pulses. Once every minute the complete
time information is available.
At the beginning of every second the amplitude of the high precision 77.5 kHz
carrier frequency is lowered by 75% for a period of 0.1 or 0.2 sec. The length of these
time marks represent a binary coding scheme using the short time mark for logical
zeroes and the long time mark for logical ones. The information on the current date
and time as well as some parity and status bits can be decoded from the time marks of
the 15th up to the 58th second every minute. The absence of any time mark at the 59th
second of a minute signals that a new minute will begin with the next time mark.
Our radio remote clocks decode the highly accurate information on date and time
within a wide range around Germany. So some of our clocks are installed in Bilbao/
Spain as well as in the city of Umeå in northern Sweden - fully satisfying the
requirements of the users. The radio remote clocks automatically switch to summertime and back. The reception of the time information is free of charge and does not need
to be registered.
Generally it is important to position the antenna in an optimal way. It should be
mounted at least 30 centimeters away from the clock unit and from solid steel. The
antenna should be aligned at a right angle to the direction of the transmitter (Frankfurt).
Figure: Decoding Scheme
P
8
3
M
4
Year of the Century
Month of Year
Day of Week
Day of Month
0
0
2
0
1
0
8
4
2
1
1
0
50
8
4
2
1
4
2
1
40
0
2
0
1
8
4
2
1
0
30
2
0
P
2
0
1
Hour
P
8
1
1
4
2
(reserved)
10
R
A
1
Z
1
Z
2
20
A
2
S
1
2
4
8
1
0
2
4
0
Minute
0
M Start of Minute (0.1 s)
R RF T ransmission via secon dary antenna
A1 Announcement of a ch ange in dayligh t saving
Z1, Z2 Time zone identification
Z1, Z2 = 0, 1: Daylight saving disabled
Z1, Z2 = 1, 0: Daylight saving enabled
A2 Announcement of a lea p second
S Start of time code information
P1, P2, P3 Even parity bits
7
HSC509
The radio remote clock HSC509 has been designed for applications where two
independent serial interfaces and up to four free programmable relay outputs are
needed. The clock also offers the possibility to control slave clocks via the integrated
slave clock drivers. The clock is equipped with an internal power supply.
HSC509
NETZ
MOD.
FLED
FREIL.
CLR/ACK NEXT INCMENU
Frontview HSC509
HSC509 F eatures
The radio clock HSC509 offers a number of functions and is mounted in a plastic
housing for wall-mounting. It provides four free programmable relay outputs, a slave
clock master with two slave lines and two independent serial interfaces. The 100mm x
160mm wide frontpanel includes a 4 x 16 character LC display, four control LEDs and
four keys. The external ferrite antenna is connected to the receiver via a 50 ohm
coaxial cable. If the distance between antenna and receiver exceeds 100m an amplifier
may be necessary.
The HSC509 contains a new flash EPROM with bootstrap loader that allows the
user to upload a new firmware via the serial interface without opening the housing of
the clock.
8
LF Receiver
An external ferrit antenna is used to receive the signal from DCF77 and supplies it to the
on-board direct conversion quadrature receiver with automatic gain control. The demodulated time marks are fed t
o the clock´s microprocessor.
Microprocessor System
The time marks from the receiver circuit are filtered and decoded by the microprocessor system. Parity and consistency checks over a period of two minutes take care for
detecting errors in the received time telegram. The checked and decoded time is
written to the on-board real time clock and spread by the interfaces. A software
watchdog lets the microprocessor recover from malfunction. A power-fail comparator
resets the microprocessor if the supply voltage drops below a specified threshold. A
flash EPROM is used as program memory which can be loaded with the firmware by
the serial interface COM0.
LC Display
The 4 x 16 character LC display is used to show the receiver´s status and let the user
edit parameters. The keys described below let the user select the desired menu. The
next chapter lists all available menus in detail. A quick reference of the available
menus and submenus can be found at the end of this document.
Buffered Real Time Clock and RAM
In case of supply voltage failure the on-board real time clock keeps the time powered
by a backup capacitor for at least 100 hours. This capacitor does not need any
maintenance. The content of the RAM is buffered also. Alternatively, the clock can be
ordered with a lithium battery which has a live time of at least 10 years guaranteed.
Slave Clocck Pulses
The radio clock generates bipolar pulses to drive slave clocks. These DC isolated
pulses are generated on a second line and on a minute line. The drivers are shortcircuit protected. A short-circuit detection ensures generating the lost pulses after the
fault has been eliminated. So the slave clocks catch up the time automatically.
9
Relay Outputs
The HSC509 provides four relay outputs that can be applied to switching times or cyclic
pulses. Eight different plans assigned to the weekdays, sundays or holidays can be edited
by the 4 keys in the frontpanel. A plan consists of up to 64 switch-on times and 64
switch-off times. Only one plan per day can be executed.
Alternative to the switching times cyclic pulses with a settable pulse length can be
programmed. A table of possible pulses and pulse lengths is given in chapter "Cyclic
Pulses". The maximum load to be applied to the relays is 50W.
Serial Interfaces
Two independent asynchronous serial ports can be used to transmit information on
date and time to other devices. Both interfaces can be configured either as a RS232
port or as a current loop port. Baudrate, framing and mode of operation can be
configured separately for COM0 and COM1. Additionally, a time zone can be assigned to each port: The drivers can be configured individually to transmit either
standard time (MEZ/MESZ=CET/CEST), standard time with suppression of daylight
saving (always MEZ=CET), or UTC. Both serial ports can send a time string once per
second, per minute or only on request The format of the time string is described in the
section "Technical Specifications".
Outputs
Both the RS232 and the current loop output of one interface (e.g. COM0) provides the
same time string and can be connected simultaneously.
When using the port in the 20mA current loop mode the additional supply voltage
of -15V is not essential either when using only the passive outputs or a lower
interference immunity is tolerated. In the second case the negative output lines have to
be connected to GND.
Inputs
Only when using the output mode "on request" the RS232 input or the 20mA current
loop input has to be connected. It is not possible to connect both inputs.
The 20mA current loop input can be driven passive or active (see "Connector Pin
Assignment"). It is possible to drive the active input without the -15V supply voltage
by connecting the "OUT-" pin to GND.
10
Installation
P ower Supply
The system requires an operating voltage of 230V/50Hz witch is applied via the power
supply cord at the bottom of the housing.
Mounting the Antenna
Generally it is important to position the antenna in an optimal way. The antenna
should be aligned at a right angle to the direction of the transmitter (Frankfurt). It
should be mounted at least 30 centimeters away from the clock unit and from solid
steel. A distance of several meters is recommended to all TVs or computer monitors.
The scope of supply includes an active ferrite antenna for indoor mounting (AI01)
and 5m of RG174 coaxial cable. When mounting the antenna outdoor the weather
proof Antenna AW02 is to use.
P owering Up the System
After connecting the power supply and the antenna the system is ready to operate.
Time, date and the relay conditions are displayed on the LC display (the timebase
choosen for COM0 is displayed).
The brighness of the “Feld” LED in the front panel depends on the signal strength of
the DCF77 carrier. In order to get the maximum signal, the antenna should be aligned
in two steps. First it should be turned slowly until the “Feld” LED is mostly dimmed.
Finally the antenna must be turned by 90° from this position to obtain maximum
signal. If the antenna is installed properly and the signal from DCF77 can be received
without strong distortions, the "Mod." LED starts blinking exactly once per second,
corresponding to the time marks from DCF77. If this LED flashes intermediately,
there is some electrical noise around which prevents the microprocessor from decoding the time message. So a better location for the antenna must be found. In case of
correct reception it takes up to three minutes after power-up until the clock is
synchronized and the "Freil." LED is turned off. It is turned on again to indicate the
loss of or an error in reception. Without RF signal the clock runs on XTAL with an
accuracy of 10-6. The "Freil." LED indicates three different alarm conditions by
blinking:
1. If the clock has lost reception for more than 12 hours the "Freil." LED starts blinking.
2. Short-circuit on the second-line; alarm message is displayed
3. Short-circuit on the minute-line; alarm message is displayed
The serial outputs are enabled immediately after power up. Baudrate, framing,
output mode and time zone can be configured separately by two DIL switches.
11
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