Just 1 item - the call below appears to set EVEN parity, but your comm control settings of 9600,N,8,1 indicate NO parity. Just a SWAG...

>*Send signal to STOP the conveyor due to Bad Scanner Read.
>*Communication is via the Scale Port, signal is ESC (chr(27)) followed
>*by a carriage return (chr(13)).
>*Parameters: Com port #, BAUD rate, Data Bits, Stop Bits and Parity
>=callfn(gnclose)
>=callfn(gnset,2,9600,8,1,"EVEN") && SCALE INTERFACE