Operation: C1SC Version
7-2 CENTRON Meter Technical Reference Guide
Physical Description
The C1SC is constructed of a flame retardant, glass-filled printed circuit board
material which supports the discrete, surface-mounted, and integrated circuitry
components. A slot antenna etched on the circuit board serves as the RF antenna.
The C1SC board snaps into the meter register mounting brackets to ease in the
installation of the board. The LAN address barcode and interpretation is placed on
the LCD housing for meter identification.
The C1SC personality module is attached to the metrology board using a board to
board connector. The following information is passed from the metrology board to
the C1SC:
• Line Voltage
• Reference Voltage
• Energy Flow direction
• Energy pulse data
• Line frequency
The C1SC has two additional labels called the meter change-out labels that are
affixed to the bottom of the meter. The change out labels are identical and contain
the AEP barcode information and a utility descriptor.
Transmission Scheme
The RF transmission is spread spectrum using Binary Phase Shift Keyed (BPSK)
modulation. A chipping signal is used to spread the carrier and actual data is on-
off-keyed (OOK). The modulator output drives the amplifier chain that provides a
signal of approximately 100mW. The antenna is tuned for maximum efficiency at
the carrier frequency.
Figure 7.2 shows how messages are typically transmitted. In the example, an
interval packet made up of 18 intervals is transmitted every five minutes. Each
interval contains a pulse count equivalent to the energy consumption for a 2.5
minute interval. The interval packet transmission represents a sliding 45 minute
window of data.
Also shown in Figure 7.2, Interval packet 0 shows that the 2.5 minute interval is
transmitted in one of the 18 packets of 2.5 minute information. Interval packet 1 is
transmitted 5 minutes later and the selected 2.5 minute interval of data is now
transmitted as the 16th packet (numbered 15). The following packet slides the
information by two 2.5 minute intervals and continues for a total of nine
transmissions. The information is then no longer in the sliding 45 minute window.
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