Response delay time
(ms)
This setting determines how long (ms) the Gateway waits before
responding to a Modbus request. This setting is only required for
Modbus RTU.
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–uses 32 bit floating point values
• Round–rounds the data value to the nearest whole number
• 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 causes 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.
Operation and maintenance Reference Manual
May 2020 00809-0600-4410
42 Emerson.com
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