• Scaled 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.
5.4.2
Register mapping
Register Mapping is the process of assigning data points from wireless field devices to
Modbus registers. These registers can then be read by a Modbus master or client. Modbus
register mapping can be found by navigating to System Settings → Protocols → Modbus.
Reference Manual Operation and Maintenance
00809-0200-4420 September 2020
Emerson.com/Rosemount 49
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