X
X
L
L
D
D
C
C
M
M
A
A
N
N
.
.
d
d
o
o
c
c
3
3
-
-
3
3
6
6
R
R
E
E
V
V
E
E
In all Models of the XL-DC, the 87-6XX GPS-XL sub-assembly open collector alarm output at P46B pin
1 has the following states:
Off (High Z)
Power off
Off (High Z)
Error, major or minor enabled alarm fault.
On (Low Z)
Normal, no major or minor enabled alarm faults.
If the processor on the 87-6XX GPS-XL sub-assembly were to fail, resulting in a failure to trigger the
watchdog timer, the watchdog timer would reset the processor and attempt to restart the system.
During the processor reset, the LED output would be Red, and the alarm output transistor open
collector would be off, indicating a fault. If the processor were unable to recover and resume triggering
the watchdog timer, a succession of watchdog timer timeouts followed by resets would result,
producing a blinking Red LED. At the same time, the open collector alarm output transistor might either
be off, or might toggle between off and on following the repeated resets, indicating an alarm condition.
The default alarm mask settings are summarized below:
Major Alarm Default Alarm Mask
PLL
Disabled
Antenna
Enabled
Receiver
Enabled
NV RAM
Enabled
Timeout
Disabled
Minor Alarm Default Alarm Mask
Time Error
Enabled
Tracking
Disabled
Tuning
Disabled
NV Battery
Disabled
Acquisition
Disabled
3-174 through 3-178 reserved
3-179 KEYPAD FUNCTION 79 - WARM START
This function issues a reset command to the Trimble SVeeSix GPS core module. It does not clear
stored almanac and ephemeris data, which are retained in battery-backed RAM.
A warm start is indicated when all other diagnostics have failed to return the XL-DC to tracking
satellites.
Press "FUNC/ENTR", then "7" "9". The display will show:
Warm start?
No
Summary of Contents for 151-600
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