Eaton IQ 150S, User & Installation Manual

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IM02601006E www.eaton.com B-3
IQ 150S/250S B: Modbus Map
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 IQ 250S Meter's Modbus Map
This section describes the log interface system of the IQ 250S meter from a programming point of
view. It is intended for programmers implementing independent 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 reg-
ister is a 2 byte MSB (Most Significant Byte) word, except where otherwise noted.
• The carat symbol (^) notation is used to indicate mathematical "power." For example, 2^8
means 28; which is 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2, which equals 256.