Meinberg NUC80E User Manual

FUNKUHREN

Technical Information
Operating Instructions

NUC80E

Impressum

Werner Meinberg
Auf der Landwehr 22
D-31812 Bad Pyrmont

Telefon: 0 52 81 / 9309-0
Telefax: 0 52 81 / 9309-30

Internet: http://www.meinberg.de
Email: [e-mail]

März 19, 2004

Table of Contents

Impressum ............................................................................................ 2

Slave Line Booster NUC80E ............................................................... 5

NUC80E Features ................................................................................ 6

Installation............................................................................................ 6

Keys......................................................................................................6

The Menus in Detail............................................................................. 7

"Uhr"........................................................................................... 7

"Uhr SET"...................................................................................7

"Minuten"....................................................................................7

"Hauptuhr" .................................................................................. 7

Alarm Menus........................................................................................ 7

Technical Specifications ...................................................................... 8

CE Label ..................................................................................... 8

Schematic Line Booster............................................................ 11

Schematic Microprocessor and Display ................................... 13

Component Layout ................................................................... 15

Component Layout Display...................................................... 17

Rear Connector Pin Assignment...............................................19

Slave Line Booster NUC80E

NUC80E is a module to control and drive slave clocks. It needs the serial timestring of
a preconnected radio clock via the serial interface. The outputs are able to drive a line
of up to 80 slave clocks with bipolar minute and second pulses. It is possible to
cascade several NUC80E to get a number of slave lines.

An alphanumeric LED display is used to show the time and the state of operation.
Two keys are used to control and configure the unit. The actual slave clock time is
stored secondly in a buffered RAM so that the slave clocks are able to catch up the
time after a power-fail.

alphanumeric Display

Keys

Front Panel

5

NUC80E Features

* microprocessor system for display, setting and output-check

* 8-digit alphanumeric display

* menu-driven configuration

* short circuit proofed line booster for minute and second lines

* integrated power supply, also for preconnected radio clock (+5V)

* buffered RAM

* optocoupler for line-control

* serial current loop interface

Installation

The passive serial current loop input of the NUC80E has to be connected to an active
serial output of a radio clock. This radio clock must send the "Meinberg Standard
Time String" once per second. NUC80E compares the time string from the serial port
with the time of the slave clocks and generates the necessary pulses on the slave clock
lines. If the slave time is behind the master time it will be catched up by generating
additional pulses on the minute line every two seconds. If the slave time is ahead the
NUC80E stops generating pulses until the master time has reached the slave time. The
fetched out pulses are checked on the board. If one of the lines is shorten, the lost
pulses are generated later after the failure has been removed.

Keys

Information on time and configuration can be retrieved by the two keys in the front
panel.The Menue key lets the user choose between several menus. Pressing Set lets
the user enter the corresponding menu.

6