User's Manual

Operation: C1SD, C1ST, and C1SL Versions
5-28 CENTRON Meter Technical Reference Guide
The kWh value broadcast in its SCM shall have six (6) significant digits. The
R300CD converts the floating point BCD kW reading extracted from the
CENTRON self read register to a fixed implied decimal with two digits of
resolution to the right of the decimal point (.01 kW). The maximum kW measured
is therefore restricted to 9999.99 kW.
Figure 5.12 on page 5-28 is a block diagram of R300CD hardware. R300CD
hardware consists of two option boards: a control section and RF section. The
control section communicates to the TOU module at rate of once per minute using
the expansion port on the TOU module. The communication speed is fixed at 2400
baud in the control section and uses the SCS protocol. In each of the two SCMs
described, the respective parameter reported is converted to a binary format for
the RF transmission. No register information is saved in the R300CD option
boards. In the instance of a power outage, the option board will update the kW and
kWh values from the self read register upon power restoration.
The R300CD features the Itron patented method of tamper detection that senses
both meter removal and inversion. The removal tamper (RTPR) increments a
counter each time the meter is abruptly removed from a live meter socket. The
tamper counter utilizes a tilt switch to detect when the meter is removed from the
meter socket. The inversion tamper (ITPR) increments a separate counter each
time the meter senses an inversion. The inversion tamper will be incremented
when an inverted status is detected through a closed tilt switch upon power up.
Each of these tamper indications are then transmitted through the radio frequency
transmission.
Figure 5.12 CENTRON TOU Personality Module with R300CD Option
Programming the R300CD Meter
In order for the R300CD meter to operate properly, you must set certain
parameters. Incorrectly set parameters will result in improper operation of the
R300CD.
The R300CD option boards use either a Load Profile (LP) or Time of Use (TOU)
CENTRON personality module. In order for the R300CD to transmit it must have a
kWh register.
Meter Base
RF Board
Control
Board
TOU
Module