Operation: CP1SD/T/L Version
CENTRON® Polyphase Meter Technical Reference Guide
49
Instantaneous Registers
The D/T/L Register is capable of displaying Primary or Secondary Instantaneous registers,
with the following exceptions: Frequency, Power Factor (PF), and Phase Angles. The user
can configure the CT and VT multipliers (transformer ratios) using PC-PRO+ Advanced
programming software.
Instantaneous Register
Quantity
Directions (Types) [Range]
Phases
W
Signed (+) Delivered or (-)
Received
Aggregate
Var
Signed (+) Delivered or (-)
Received
Aggregate
VA
(Vectorial or
Arithmetic)
None Aggregate
V
None
A, B, C
A
None
A, B, C
PF None
Average
Frequency None
A
Phase Angles
Va = 0°
Vb, Vc, Ia, Ib, Ic
Self Read and Snapshot Registers
There are up to fifteen self-read registers available in the D/T/L Register, depending on the
particular version. All meters have two snapshot registers that store self read data triggered
by a demand reset. Snapshot 1 is taken at the most recent demand reset. Snapshot 2 is the
next most recent set of self read data at demand reset. Meters with time keeping
functionality have an additional twelve self-reads registers used for scheduled self-reads,
and one Last Season self-read register triggered at a season change in TOU meters.
Information Registers
The D/T/L Register also stores a significant amount of informational data. These non-
registered values are listed in Informational Data.
Interrogation and Programming
Interrogation
The meter can be interrogated via the ANSI C12.18 optical port using PSEM (ANSI
C12.18-1996) protocol.
