Instruction manual

PROTOCOL
Protocol refers to the format, sequence and value of the data fields used in
communication messages. Each data field of a BW100 message contains one or
more bytes of ASCII binary code.
Each byte contains:
» 8 data bits
» no parity bit
» 1 stop bit
DATA FIELD DESCRIPTIONS
The following data fields are used.
som
BW100 start of message, ASCII character = STX (Hex Value = 02).
DEVICE
Identifies the BW100 to which the message applies. The device is a 2 character
number that equals the Unit I.D. code, (P761). ASCII characters = 00 to 15.
MT
Identifies the 2 character message type transmitted, ASCII characters:
50 = material flow rate
51 = material load
52 = belt speed
53 = totalizer 1,
internal
54 = totalizer 2, internal
READING
Contains the measurement value in the engineering units of measure selected
during BW100 programming. The number of bytes in this data field varies dependent
upon the reading value. Up to 8 ASCII characters including the decimal point may
be transmitted.
UNITS
Three ASCII characters identify the totalizer engineering units (MT=53 and MT=54).
The first character is always a space. The remaining characters may be:
t = tonnes
T = tons
LT = long tons
kg = Kilograms
lb = pounds
eom
BW100 end of message, ASCII character = CR (Hex Value = 0D).
OPERATION
PL-531 54