Setra Super Count
TM
Operator's Manual 51
Although Setra scales can communicate with almost any RS-232 device, the built-in interface does
not include the complete protocol. Only the transmit and receive lines of the standard interface are
used.
The data format is: 1 start bit
8 data bits including parity
1 stop bit
10 bits per frame (framing errors ignored)
NOTE: The scale will transmit using the parity selected; however it does not check the parity it re-
ceives.
Use an RS-232 cable to connect the external device to the scale, or construct one following the
instructions below.
The serial port uses an eight pin modular connector. The pinout is as follows:
1 ground
2 transmit out
3 receive in
4 no connection
5 no connection
6 optional +5V @ 250 ma*
7 ground
8 ground
* If the fuse (Setra P/N 404722) is installed, power is provided for the Auto Count 200 or an intelligent
bar code wand (Setra P/N 403676), CCD or laser scanner.
NOTE: The “handshake” signals, such as “Clear To Send” (CTS), are not implemented. This requires
that the peripheral have a minimal buffer (15 characters).
In addition, some computers requiring handshaking will need a connection between two pins on the
computer’s connector named DTR and DSR (Data Terminal Reading and Data Set Ready). CTS may
also need to be jumpered to RTS at your computer interface (Clear to Send and Ready to Send).
The maximum recommended cable length is 15 meters. The cable may be longer if it has less than
2,500 pF capacitance. The load impedance of the device connected should be between 3,000 and
7,000 ohms with not more than 2,500 pF shunt capacitance. For more information, consult EIA Stan-
dard RS-232: “Interface Between Data Terminal Equipment Employing Serial Data Interchange.”
The following is a short example of a BASIC program which will a) set the PC’s “COM” port for use with
a Setra Super Count scale, b) obtain a verification message, c) clear and zero the scale, d) set the
Modular Jack
Connector
(in back of scale)
8 1
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