Fairbanks FB2550 DAT SERIES DRIVER ACCESS TERMINAL - Manual (Page 134)

Appendix I: Fieldbus Interface Reference Data
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C. SOFTWARE SPECIFICATIONS, CONTINUED
INPUT DATA FORMAT FROM GATEWAY, CONTINUED
STX character 1 byte, (02h)
Command word 0 2 bytes, (includes scale ID)
Command word 1 2 bytes,
Command word 2 2 bytes,
Setpoint 1 weight 6 characters,
Setpoint 2 weight 6 characters,
Tare Weight 6 characters,
Display Message 1 26 characters,
Display Message 2 26 characters,
Display Message 3 26 characters,
CRC 1 byte,
ETX character 1 byte (03h)
NOTE WEIGHT VALUES sent over the serial channel will represent data 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 integer value in the
register will be sent over the serial channel.
– If it is set to be 16 bit, the high order word will be ignored.
– If the data is set to be floating point, then the floating point value will be
multiplied by the scale factor and the integer portion of this resulting value will
be sent over the serial channel.
– In all cases if the resulting integer is greater than 999999, a value of 000000
will be sent over the Serial Channel.
– In all cases the scale must multiply the integer by the scale factor to determine
the actual weight.
 Serial data is transferred according to the RS232 specification between the
gateway and the FB2550 DAT. The communications parameters are listed below.
Baud 115,200
Data Bits 8
Parity None
Stop Bits 1