X
X
L
L
D
D
C
C
M
M
A
A
N
N
.
.
d
d
o
o
c
c
3
3
-
-
7
7
1
1
R
R
E
E
V
V
E
E
If a checksum error is detected while recalling settings from non-volatile RAM, an NVRAM data fault is
indicated. This same fault is active if an attempt was made to recall non-volatile RAM settings and
default settings were created since no settings were found. This can occur if the non-volatile RAM
battery is low or jumper JP1 is removed. An NVRAM fault is indicated since the operator should check
the non-volatile settings to verify that they are correct. After the operator has confirmed that all settings
are correct, the following command can be used to cancel the error, so that future errors can be caught.
F73<SP>CLEAR<SP>NVRAM<SP>FAULT<CR>
clears the fault and returns:
OK<CR><LF>
Model XL-DC-600 and XL-DC-601 have a Red/Green Status LED that is controlled by Function 73. In
general, faults only affect the Status LED if they are enabled. However, even if there is no enabled
major or minor fault, the presence of the time error fault is indicated by a solid Green Status LED if
BLINK = ENABLE (default). Normal operation within the user-defined time error threshold is indicated
by the Green LED blinking at a one pulse per second rate.
The Red/Green Status LED has the following states (when BLINK = ENABLE):
Off Power off
Solid Red Major enabled alarm fault
Solid Orange Minor enabled alarm fault, time error outside threshold.
Blinking Red/Orange Minor enabled alarm fault, time error within threshold.
Solid Green No enabled alarm faults, time error outside threshold.
Blinking Green No enabled alarm faults, time error within threshold.
The Red/Green Status LED has the following states (when BLINK = DISABLE):
Off Power off
Solid Red Major enabled alarm fault
Solid Orange Minor enabled alarm fault
Solid Green No enabled alarm faults
In all implementations using the 87-6XX GPS-XL Module, the open collector alarm output 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 Module 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 Status 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 Status 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.
LED BLINKING can be ENABLED or DISABLED in all but the processor reset condition.
Sending: F73<SP>BLINK ENABLE<CR>
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