User's Manual

Operation: C1SR Version
CENTRON Meter Technical Reference Guide 6-9
IDM Tamper Detection
Removal Tamper
This will be implemented by observing a tilt event in
close proximity to a power outage.
Inversion Tamper
We will implement this by taking advantage of the tilt
switch. On power-up we do a prolonged read of the tilt
switch to see if it is inverted. If so then we can flag this as
an inversion and increment the counter. This will
distinguish it from a removal tamper which would
happen on a loss of power.
Reverse Rotation
Tamper
We will monitor the sign signal along with the energy
coming from the metrology to determine when the meter
is operating in the reverse direction and increment the
counter.
Power Loss Tamper
This will be implemented by incrementing the counter
each tme we power up.
Reprogramming
Tamper
0 - Not applicable because it will not be field
programmable.
Physical Tamper
On the 51ESS this is simply implemented as the lower 2
bits of the Inversion Tamper Counter. We will do the
same.
Encoder Tamper The lower two bits of the Removal Tamper Counter
Spare Tamper 0 - Not used
Async Counters 0 - Not used, Future use
Time Offset See "Time Offset" in section 7.9 Message Timing