Specifications

Appendix IV

RS-232 Serial Data Communications

Setra Models 12000L, 5000L, 2000L and 500L come equipped with a bidirectional RS-

232 interface. Users who have purchased a Setra printer may simply follow the

directions under “Printing Out Information.” It may be necessary to read this section to

connect the balance to another device. The RS-232 software interface is discussed in

the first portion of this appendix. The RS-232 hardware interface is discussed in the last

portion of this appendix. For information on connection and data type, consult the

hardware section.

INTERFACING TO A COMPUTER

The bidirectional RS-232 interface not only allows the balance to transmit data to a

computer, but also enables the use of a computer to control the balance. Since the baud

rate of this interface is selectable (see Appendix I- “BAUD RATE”), virtually any

computer or terminal with an RS-232 interface can be connected to the balance. This

section describes the conventions and formats used to communicate with a Setra

balance.

SENDING COMMANDS TO THE BALANCE

All functions which exist on the keyboard 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:

Function ASCII Hexadecimal Function ASCII Hexadecimal

CAL F46 0 030

CLEAR K 4B 1 1 31

CONV U 55 2 2 32

INT I 49 3 3 33

% % 25 4 4 34

PRINT P 50 5 5 35

SAMPLE NO. S 53 6 6 36

TARE T 54 7 7 37

X10 X 58 8 8 38

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