10
motion - space if there is no motion or an “M” if there is motion
CC - weight status (“OC” if weight exceeds scale capacity, “BZ” of the weight
is below zero, “MO’ if there is motion)
CR - carriage return (0Dhex)
SERIAL INPUT COMMANDS
The second serial port on the 748 is a bi-directional port and can both receive and transmit serial
data. It is possible to control the operation of the 748 by transmitting serial commands to the
instrument via this serial port. This is accomplished by transmitting a command string which is then
acted upon as if it were received from the instrument’s keyboard. The basic format for this serial
command is:
STX KeyCommand [SubCommand] [Weight Value] CKsum ETX
where: STX - Start of Text (hex 02) MUST precede ALL serial commands.
KeyCommand - One of a table of predefined command functions. Note: All
commands are subject to rejection just as commands from the
keyboard.
SubCommand - Optional command parameter.
Weight Value - Optional weight value required by some Key Commands. Note:
The weight value must meet the displayed division, capacity, and
decimal point precision of the indicator.
CKsum - XOR checksum of command (
excluding
STX
and
ETX) Note: For
instructions on how to calculate the checksum value, refer to the
CHECKSUM CALCLATION section of this manual.
ETX - End of Text (hex 03) MUST terminate ALL serial commands.
The KeyCommand functions are:
KeyCommand - 0
Equivalent Keyboard Key - GROSS
Function - Switch 748 to Gross Weight Mode
Serial Command Format - STX0CKsumETX
Hex Format to Transmit - 02H 30H 33H 30H 03H
Equivalent Computer or Terminal Keys to press - Ctrl B 0 3 0 Crtl C
KeyCommand - 1
Equivalent Keyboard Key - NET
Function - Switch 748 to Net Weight Mode
Serial Command Format - STX1CKsumETX
Hex Format to Transmit - 2H 31H 33H 31H 3H
Equivalent Computer or Terminal Keys to press - Ctrl B 1 3 1 Ctrl C
Key Command - 2
Equivalent Keyboard Key - lb/kg
Function - Toggle the 748 beyween Lb and Kg modes
Serial Command Format - STX2CKsumETX
Hex Format to Transmit - 2H 32H 33H 32H 3H
Equivalent Computer or Terminal Keys to press - Ctrl B 2 3 2 Ctrl C
KeyCommand - 3
Equivalent Keyboard Key - ON/ZERO
Function - Zero the weight displaly
Serial Command Format - STX3CKsumETX
Hex Format to Transmit - 2H 33H 33H 33H 3H
Equivalent Computer or Terminal Keys to press - Ctrl B 3 3 3 Crtl C
KeyCommand - 4
Equivalent Keyboard Key - PRINT
Function - Initiate a print sequence at the printer serial port
Serial Command Format - STX4CKsumETX
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