Meinberg DCF77, Operating Instructions Manual

Page: 10 / 18

10
Pin assignments of the 9 pin connector
When the clock is being shipped, only the signals needed for the serial port are gated
to their pins at the 9 pin connector. If another signal shall be available outside the
computer, the corresponding lever of the DIL switch on the board must be set to the
ON
position to connect that signal to its associated pin.
Whenever an additional signal is connected through to the rear panel, special
care must be taken to the configuration of the cable used with the connector. If
pins with TTL level and RS-232 levels are connected to each other, the circuits on
the board may be damaged.
The table below shows the assignments of the 9 pin connector and the correspon-
ding levers of the DIL switch:
Pin Signal SWITCH
1 +5V 1
2 RxD in (RS-232) --
3 TxD out (RS-232) --
4 P_MIN out (TTL) 5
5 GND --
6 (reserved) --
7 P_SEC out (RS-232) 3
8 P_SEC out (TTL) 4
9 (reserved) --
The signals which have no lever of the DIL switch assigned are hard wired to the pins
of the connector. All levers of the DIL switch which are not listed in the table are
reserved and should remain in the
OFF
position.
Installing the PEX511 in your computer
Every PCI Express board is a plug&play board. After power-up, the computer's BIOS
assigns resources like I/O ports and interrupt numbers to the board, the user does not
need to take care of the assignments. The programs shipped with the board retrieve
the settings from the BIOS.
The computer has to be turned off and its case must be opened. The radio clock can
be installed in any PCI Express slot not used yet. The rear plane must be removed
before the board can be plugged in carefully. The computer´s case should be closed
again and the antenna connected to the PEX511´s coaxial plug at its rear.