Operation: CP1SR Version
CENTRON® Polyphase Meter Technical Reference Guide
27
Net Metering
The CP1SR module is available with the option of net metering capability. When the net
option is enabled, received energy is subtracted from delivered energy. The net energy value
is then displayed on the register.
Resetting Values
The ZRO-C2A Resetter zeros both the energy registers and tamper counters by direct
connection to the CP1SR module. For more information, see the
ZRO-C2A Handheld Meter
Resetter for the CENTRON C1S and C1SR Operating Instructions
.
Transmission Scheme
A transmission cycle contains a wait period before and after each message burst and a
period of random silent time. The silent time is determined by the scaling factor, which sets
a minimum and maximum silent time between each transmission cycle.
The transmission frequencies (within the 910-920 MHz band), the frequency hopping
pattern, and the time interval between transmission cycles are completely random in nature.
This randomness provides a method for avoiding interference with transmissions from other
devices. The figure below shows an example of the CENTRON Polyphase meter CP1SR
transmission cycle containing one message burst.
Power
up
0 – 30 Sec .
30 Sec .
30 Sec .
30 Sec .
First
Transmission
2 Sec
1 . 5 Sec
1 . 0 Sec
0 .5
Sec
0. 5
Sec
1. 0 Sec
1. 5 Sec
2 Sec
Figure 19: CENTRON-IDM High Power SCM/IDM Transmission Scheme
In the figure above, if the transmission is an IDM/SCM message pair, then the SCM
occurs 250 milliseconds following the completion of the IDM.
