Rosemount Smart Wireless Gateway Specifications download pdf (Page 45)

Reference Manual

00809-0200-4420, Rev HB

Section 5: Host Integration

January 2015

Host Integration

Baud Rate: The data rate or speed of serial communications. This setting is only required for

Modbus RTU.

Parity: This setting determines parity (none, even, or odd) to use for error checking purposes.

This setting is only required for Modbus RTU.

Stop Bits: This setting determines the number (1 or 2) of stop bits to use when ending a

message. This setting is only required for Modbus RTU.

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 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

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Rosemount Smart Wireless Gateway Specifications Page 45

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