Meinberg GPS164xHS - Manual (Page 17)

17
The front panel layout
FAIL LED
The FAIL LED is turned on whenever the
receiver is not synchronous to the GPS-
system.
LOCK LED
The LOCK LED is turned on if the recei-
ver has acquired at least four satellites
and has computed its position after po-
wer-up. In normal operation the receiver
position is updated continuously as long
as at least four satellites can be received.
When the receivers position is known and
steady only, a single satellite needs to be
received for synchronization and genera-
tation of output pulses.
OCx LEDs
The LEDs OC1, OC2 and OC3 are indicating the status of the corresponding pulse
output. A burning LED symbolizes the ON-state of an optocoupler.
BSL Key
Whenever the on-board software must be upgraded or modified, the new firmware
can be downloaded to the internal flash memory using the serial port COM0. There is
no need to open the metal case and insert a new EPROM.
If the BSL key behind the front panel is pressed during operation, a bootstrap-
loader is actived and waits for instructions from the serial port COM0. The new
firmware can be sent to GPS164xHS from any standard PC with serial interface. A
loader program will be shipped together with the file containing the image of the new
firmware.
The contents of the program memory will not be modified until the loader program
has sent the command to erase the flash memory. So, if the BSL key is pressed
unintentionally, the firmware will not be changed accidentially. After the next
power-up, the system will be ready to operate again.
GPS164DHS
COM 0 COM 1
GPS
Ant.
DCF
Lock
Fail
BSL
Ub
Oc 1
Oc 2
Oc 3
+
+
+
+
-
-
-
-
Out
TC_Out
(DCLS)
TC_Out
(AM)