User Manual

Table Of Contents
On Air Message Types 4-8
SmartPoint Module for the Elster A3 Meter ECMTM40000
4.8 C&I Meter Read With History—App Code 13
4.8.1 Message Format
This is the standard meter reading message and has the following format:
4.8.2 Relative Time Stamp
16 bits of byte 0-1, elapsed time since last meter reading. Time is always represented in two-second
resolution.
4.8.3 Delta Data Type
3 bits, bits 0-2 of byte 2. Used to define the amount of time represented by each History Sample in
bytes 8-27. The valid values for Delta Data Type are defined in the table below.
4.8.4 Compression Enabled
1 bit, bit 3 of byte 2. If set, the History Sample in bytes 8-27 are sent in the data compression enabled
format. If cleared, the History sample bytes are sent in the fixed bin width format.
4.8.5 Current Meter Reading
20 bits, bits 4-7 of byte 2 and all of bytes 3 and 4. The total power consumption represented in binary
in kWh.
App Data
Byte
0-1 2-4 5-8 9-11 12-27
Data
Relative
Time
Stamp
Delta Data
Type / Current
Reading
Peak
Demand
Reading
Phase A,
Phase B,
Phase C
Voltage
History Samples
Delta
Data
Type
History
Samp
Interval (min)
Max Pulses
per Interval
Likely
Transmit
Rate
0
5 28.33 30 min
1
15 85.00 1 Hr
2
60 340.00 4 Hr
3
360
(6 Hours)
2040.00 6 Hr
4
720
(12 Hours)
4080.00 12 Hr
5
1440
(24 Hours)
8160.00 12 Hr