45
V
ALUES
R
EQUIRING
T
WO
R
EGISTERS
Additionally, some values (e.g., kilowatt hours) may cover a dynamic range that is larger than 65535 and
require two Modbus registers. Any parameter in the
Modbus Register Assignment
tables that shows
two registers (identified by the terms MSW (Most Significant Word) and LSW (Least Significant Word))
are examples of this wide-ranging parameter.
To interpret the values contained in these registers, the steps are:
1)
Multiply the MSW register by 65536.
2)
Add the result to the value found in the corresponding LSW register.
3)
Multiply the result by the appropriate scalar value from Table I-2.
For example, assume that System Total True Energy (kWh) is desired and the
value of 5013 is read from register 44001 (LSW) and 13 is read from register
44002 (MSW) and that the register 44602 data scalar is set to 3.
To calculate the total kWh recorded:
Multiply the MSW by 65536: 13 X 65536 = 851968
Add the LSW: 5013 = 856981
Multiply by the scalar 3 value of 0.1: 856981 X 0.1 = 85698.1 kWh
C
ONFIGURATION
R
EGISTERS
Modbus
Offset
Register
Description
40129
0128
Synchronize Register
Multiple Power Patrol’s synchronization register
44066
4065
Clear Accumulated
Measurements
Writing 1234 resets all 'H' registers, accumulated
Power Patrol data (kWh, kWh, etc) stored in flash to
CAM Default value
44525
4524
CT Type All
Writes same type for all CTs: 1=MilliVolt, 2=Rogowski
44526
4525
Slave ID
!1=SETRA, 1=Veris; Sets SLAVE_ID to Veris or SETRA
44599
4598
CT Phase Shift All
CT Phase Shift X 100 +/-
Writes same value to Registers 50199, 50299, &
50399
44600
4599
CT Integer All
Integer value of all CTs, Writes same value to
Registers 50100, 50200, & 50300
44601
4600
CT Decimal All
Decimal value of all CTs, Writes same value to
Registers 50100, 50200, & 50300
44602
4601
Data Scalar
A Value of 0-6 that changes the scaling of certain
registers
44603
4602
Demand Window Size
Demand window size in minutes; default is 15 min
D
ID
Y
OU
K
NOW
?
When reading two
register values,
HeadStart
automatically
calculates the total
value.