DROP OFF STATS 1-80
is a read only screen that shows the accumu-
lated number of failed “presence requests” by address since the last
CLEAR in the ERROR STATISTICS screen. This screen shows address-
es 1-80. Each address gets TWO locations to accumulate in. The total is
listed in HEX format. 0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f where f is the equiva-
lent of 16 in ordinary numbers. Thus with two locations one can count up
to 256 (FF). The screen below is of the first 80 addresses on a bus that
has been played with considerably.
Address 1
3
5
7
9
Address 80
DROP OFF STATS 81-127
Though these screens are labeled “DROP OFF STATS” this is a misnomer.
They only show failures to answer the “are you there” command, NOT Drop
OFFs. A drop off would be three communications failures in a row. The DROP
OFFs are counted in ERROR STATSISTICS. A high number on one of
these pages would show the most likely culprit who is doing the Dropping
OFF.
BUT as mentioned before these answer failures may not be due to a bad
item at that address on the bus. They could be due to a bad item on the bus
one item or two items closer to the clock. They could also be due to an
unterminated bus or an additional terminator in the middle of the bus. Once
the bus is not terminated all bets are off. This is why terminating the bus is of
such importance.
MORE DIAGNOSTICS
DEFAULT TO MAIN: Yes
TRIGGER: NONE
DROPOFF STATS 1-80
DROPOFF STATS 81-127
RESET COUNTS
SCAN BY FACTORY-ID
RESET COUNTS is a vital screen that shows the
number of times each of the control cards and the
clock have been reset. A reset should ONLY occur
on a Power Down or a Power failure. A high reset
count means there is something awfully wrong with
the system. Examples are:
a) Software malfunction. The DTC is resetting
because of a new upload that is not quite right.
b) No Terminator on the bus.
c) Multiple overlapping addresses on the bus.
The DTC is listed first followed by each of the relay cards by their
addresses. N/A-OLD means that that particular relay card has old
firmwear that does not support the reset count feature.
After a system has been started up the count should be cleared
and checked a few days later. The only acceptable result is the
number of power outages since the last look. If more than that
please report it to a Technician at LC & D.
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