Meinberg GPS169PCI - Manual (Page 11)

11
Connectors and LEDs in the rear slot cover
The coaxial antenna connector, two status
LEDs and a 9 pin sub D connector can be
found in the rear slot cover. (see figure). The
upper, green LED (LOCK) is turned on when
after power-up the receiver has acquired at
least four satellites and has computed its posi-
tion. In normal operation the receiver position
is updated continuously as long as at least four
satellites can be received.
The lower, red LED (FAIL) is turned on
after power-up until the receiver has synchro-
nized or if a severe error occurs during opera-
tion.
The 9 pin sub D connector is wired to the
GPS169PCI's serial port COM0. Pin assign-
ment can be seen from the figure beside. This
port can not be used as serial port for the compu-
ter. Instead, it can be uses to send out Meinberg's
standard time string to an external device.
A DIL switch on the board can be used to wire some TTL inputs
or outputs (0..5V) to some connector pins. In this case, absolute
care must be taken if another device is connected to the port,
because voltage levels of -12V through +12V (as commonly used
with RS-232 ports) at TTL inputs or outputs may damage the
radio clock.
Behind the little hole in the slot cover there is a push button (BSL) which is needed
if the clock's firmware shall be updated. See the chapture about firmware updates for
details.
GPS
antenna
modulated
timecode
LOCK FAIL
BSL key
RxD
TxD
GND