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Reference Manual
00809-0100-4052, Rev AA
Section 3: Host Integration
April 2015
Host Integration
Unmapped register read response: This is the value returned by the Gateway if the Modbus
master requests a register with no data assigned to it (empty register). It is recommended this
be set to zero fill to prevent errors.
Floating point representation: This setting determines if the Gateway uses floating point
values or integer values. There are three options for this setting:
Float: This option uses 32 bit floating point values.
Round: This option rounds the data value to the nearest whole number.
Scaled: This option uses scaled integers to offset negative values or increase decimal
point resolution. The equation for scaled integers is:
y = Ax - (B - 32768)
Where:
y = Scaled integer returned by the Gateway
A = Gain for scaled integer value
x = Measured value from wireless field device
B = Offset for scaled integer value
Use swapped floating point format: This setting switches which register is sent first for a
floating point value. This setting is only used for floating point values.
Incorporate value's associated status as error: This setting will cause the Gateway to report a
predetermined value when a communications or critical diagnostic error is received from the
wireless field device. The value is user configurable depending on which floating point
representation is chosen. See Value reported for error below.
Value reported for error (floating point): This setting determines what value is reported if the
wireless field device reports a failure or stops communicating to the Gateway. This setting is
used for floating point values. The choices are NaN (not a number), +Inf (positive infinity), -Inf
(negative infinity), or Other (user specified).
Value reported for error (rounded and native integer): This setting determines what value is
reported if the wireless field device reports a failure or stops communicating to the Gateway.
This setting is used for rounded or scaled integers. The choice is a user specified value between
-32768 and 65535.
Scaled floating point maximum integer value: This determines the maximum integer value
for the purpose scaling integers. 999-65534.
Use global scale gain and offset: This setting determines if a global gain and offset is applied
for scaled integers or if each value has a unique gain and offset. Unique gain and offsets are
found on the Modbus Mapping page.
Global scale gain: This value is multiplied to the data values for the purpose of scaling integers.
If global scaling is not selected, a gain value will be available for each separate data value on the
Modbus Mapping page.
Global scale offset: This value is added to the data values for the purpose of scaling integers. If
global scaling is not selected, an offset value will be available for each separate data value on the
Modbus Mapping page.