Fieldbus / 4-20 ma, continued – Fairbanks FB2255 Series Instrument PC2255 PC Software Utility Program User Manual

Page 56

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Section 6: PC2255 Utility Software

01/13

56

51297 Rev. 1

6.7. Fieldbus / 4-20 mA, Continued

OUTPUT

Data from the FB2255 comprises of three (3) 32-bit words.

•

Gross Weight

•

Tare Weight

•

A 32bit Status Word

•

Gross and Tare weights can be selected as either a 32-bit Integer or a 32-bit

Floating Point Word.

•

The Most significant Byte indicates the Weigh Mode

"G"

for Gross, and

"N"

for Net.

•

The Next Order Byte indicates

"O"

Overcapacity,

"M"

Motion of the last

command received. (See INPUT Commands)

The next order byte indicates the weight units.

•

"l"

pounds

•

"k"

kilograms

•

"o"

ounces

•

"g"

grams.

The Least Significant Byte indicates the number of decimal places, if the weight
output is selected to be a 32-bit Integer word.

– If a Floating point word is selected, this byte will be

“0”.

INPUT

Single Byte Commands can be sent from the network.

– Although the input is read as a 32-bit word, only the Least Significant Byte is

used in this process.

– When the command is sent and recognized, it is entered into the 32 -bit status

byte in the Least Significant Command Byte location.

– New commands can be transmitted after transmitting a

NULL

command.

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