B.5: Retrieving Logs Using The Shark® 200 Meter's Modbus Map - Electro Industries Shark 200 Installation & Operation Manual

The sign of the mantissa (and therefore the number) is 1, which represents a
negative value.
The Exponent is 10001001 (binary) or 137 decimal.
The Exponent is a value in excess 127. So, the Exponent value is 10.
The Mantissa is 11000010001110110111001 binary.
With the implied leading 1, the Mantissa is (1).611DB9 (hex).
The Floating Point Representation is therefore -1.75871956 times 2 to the 10.
Decimal equivalent: -1800.929
NOTES:
• Exponent = the whole number before the decimal point.
• Mantissa = the positive fraction after the decimal point.
B.5: Retrieving Logs Using the Shark® 200 Meter's Modbus Map
This section describes the log interface system of the Shark® 200 meter from a
programming point of view. It is intended for programmers implementing indepen-
dent drivers for log retrieval from the meter. It describes the meaning of the meter's
Modbus Registers related to log retrieval and conversion, and details the procedure
for retrieving a log's records.
NOTES:
• All references assume the use of Modbus function codes 0x03, 0x06, and 0x10,
where each register is a 2 byte MSB (Most Significant Byte) word, except where
otherwise noted.
• The carat symbol (^) notation is used to indicate mathematical "power." For exam-
ple, 2^8 means 2
Electro Industries/GaugeTech
Electro Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
The Leader In Power Monitoring and Smart Grid Solutions
8
; which is 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2, which equals 256.
B: Modbus Map and Retrieving Logs
#
Doc E149701 B-3