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Appendix VI
RS-232 Serial Data Communications
Setra scales come equipped with a bidirectional RS-232 interface. Users who have
purchased a Setra 240P or 340P printer may simply follow the directions under
“Printing Out Information” in order to connect the scale with that unit. Users who are
interfacing a scale to the Setra Auto Count 200 System should follow the installation
instructions in the operator’s manual for that equipment. It may be necessary to read
all or part of this section in order to connect a Setra scale with a different printer or a
computer.
The beginning of this appendix covers the RS-232 software conventions. Interface
hardware information can be found later in the appendix. For information on connec-
tion and data type, consult “The RS-232 Interface Hardware” section.
Interfacing a Setra Scale to a Computer
The bidirectional RS-232 interface not only allows the scale to transmit data to a
computer, but also enables a computer to control the scale. Since the baud rate of
this interface is selectable (see Appendix II - "Baud Rate"), virtually any computer or
terminal with an RS-232 interface can be connected to the scale. This section
describes the conventions and formats used to communicate with a Setra scale.
Sending Commands to the Scale
All functions which exist on the keypad may also be accessed by a computer or
terminal using the RS-232 port. Simply send the ASCII character which corresponds
to a function. These characters are shown in the following table.
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