C. software specifications, continued, Input – Fairbanks FB2550 DAT SERIES DRIVER ACCESS TERMINAL User Manual
Page 133

Appendix I: Fieldbus Interface Reference Data
2/2013
133
51303 Rev. 1
C. SOFTWARE SPECIFICATIONS, CONTINUED
NOTE WEIGHT VALUES
sent over the Serial Channel will be represented
in the Fieldbus registers based on the settings of
bits 14
and
15
in
STATUS
WORD 0.
– If the data is set to be a 16 bit or 32 bit integer, then the register value will
contain the integer value and the host must multiply this by the scale factor to
get the actual weight.
– If it is set to be a 16 bit integer, and the integer value is greater then 65535, a
value of
0
is placed in the register.
– If the data is set to be
FLOATING POINT
, then the gateway will multiply
the integer value received by the scale factor, and place the resulting 32 bit
floating point value in the register.
▪ In this case the host does not use the scale factor to interpret the value.
INPUT
DATA FORMAT FROM GATEWAY
The Gateway will send a string to the Serial Port reflecting data from the Fieldbus.
The following is the definition of the serial string for one (1) scale.
– The scale ID in the Fieldbus register for Command word 0 for a scale must be
set to the correct value (1-4) before data for that scale will be sent over the
serial channel.
– If the scale ID is set to the correct value, any time any data for this scale
changes the data will be sent out the serial channel.
– Command word data is sent as binary values MSB first over the serial
channel.
– Weight data is sent as six (6) characters representing a six (6) digit decimal
value
(
000000 – 999999
).
– This decimal value represents the weight multiplied by the scale factor listed in
command/status word 1 bits 0-2
.
– The serial string is a fixed length of 105 bytes.