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O p e r a t i o n s a n d I n s t r u c t i o n M a n u a l
Sage Register Output Format
INTEGER REPRESENTATION
Computer systems hosting a MODBUS network
typically store integer values to represent non-
fractional quantities.
All registers addressed above 256 (0x0100-0x1FF) will
transfer 16 bit integral quantities in response to all
master queries. MODBUS requires that the register
count reflects each 16 bit registers transmitted to
ensure that no bytes are missing in the transfer of
integer quantities. (Note: Most Sage Rio registers are
IEEE754 quantities; integer representations of these
registers will require significant translation.)
IEEE754 FLOATING POINT
Computer systems hosting a MODBUS network typi-
cally store single precision floating point data in the
standard IEEE754 format.
All registers addressed above 512 (0x0200-0x02FF)
will transfer full 32 bit single precision quantities
in response to all master queries. MODBUS requires
that two 16 bit registers are transmitted to ensure
that no bytes are missing in the transmission of
32 bit quantities.
SCALED DECIMAL REPRESENTATION
Computer systems hosting a MODBUS network may
choose represent single precision floating point val-
ues as scaled long integers (32 bit values). The Sage
Rio will convert floating point registers to integral
units by multiplying the value by 1000.
Ex. Floating point value 1234.567 will be converted
to integral value 1234567
All registers addressed above 768 (0x0300-0x03FF)
will transfer full 32 bit scaled integer quantities in
S A G E M E T E R I N G , I N C .
response to all master queries. MODBUS requires
that two 16 bit registers are transmitted to ensure
that no bytes are missing in the transmission of
32 bit quantities.
For more information on the MODBUS protocol, see:
http://www.modbus.org/tech.php
SAGE ADDRESSER SOFTWARE
Addresser is a convenient software kit that includes
Addresser software, as well as an optically isolated
ULINX RS485 to USB converter. The Addresser is a
READ/WRITE Program with drop-down menus for
convenient user interface between your PC or laptop
and the Modbus Terminals of the Sage Rio. Con tact
Sage for ordering information and instructions.
SAGE ADDRESSER TECHNICAL ASSISTANCE
Visit our website at www.sagemetering.com, select
"Knowledge Base" and "Service Manuals & Guides"
then select "PRO-PRM-080911 Website Addresser
3_14" or "Modbus Poll Instructions".
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REV. 10-SIX/SRX
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