D
ESCRIPTION OF
S
YSTEM
6844
AND
6844RC
System 6844(RC) - V03.00
21 / 157
hopf
Elektronik GmbH
Nottebohmstr. 41
• D-58511 Lüdenscheid • Tel.: +49 (0)2351 9386-86 • Fax: +49 (0)2351 9386-93 • Internet: http://www.hopf.com • E-Mail: [email protected]
1.2.3.4 Status LEDs
The 1U System has status LEDs on both the front and rear sides. These allow the System
status to be recognized in the installed condition in the control panel, whilst operating via the
front panel as well as whilst checking the cabling on the rear side of the System.
The LEDs indicate the following System conditions:
POWER
ON
Power
Power
(green)
ON The System is in operation
OFF The System is out of operation
(for example, it is switched off, defec-
tive or the power supply has failed)
Front side
Rear side
SYNC. STATUS
ON OFF
S y n c .
Sync.
(red)
ON The system is
not
currently synchro-
nized by the installed Sync.-Source
respectively
Sync.
(green)
ON The system is currently synchronized
by the installed Sync.-Source or the
SyncOFF Timer is active
1.2.3.5 System-Bus 6000
The System-Bus, consisting of the Bus Board with VG ledges, via which the Control Board
6844(RC) and the Function Boards are connected, can be found in the System 6844(RC).
The System-Bus serves to provide:
Distribution of the time information.
Communication between Control Board 6844(RC) and the Function Boards.
Transmission of the regulated second pulse (PPS). This serves to synchronize the da-
ta output of the implemented Function Boards.
Distribution of the regulated DCF77 pulse (generated by the Control Board 6844(RC)).
Circular auto-reset circuit for ongoing verification of the System-Bus Function Boards
to be found in the System.
Power supply for the installed boards.
Each active Function Board (transmit and receive) which is linked to the System-Bus has a
SEND
LED. This LED signals which of the Function Boards is active on the System-Bus.
Function Boards which only receive data from the System-Bus do not have a
SEND
LED.
