Appendix Iv; Rs-232 Serial Data Communications; The Rs-232 Interface Hardware - Setra Systems Quick Count Operator's Manual

Your Setra Quick
interface using a default baud rate of 2400 and no parity. Users who
have purchased a Setra 240P or 340P printer may simply follow the
directions under " Printing Out Information"
scale. Users who are interfacing a scale to the Auto Count 200 or to
another printer for a custom label design using ScriptCoder should
follow the installation instructions in the operator's guides for those
products.

The RS-232 Interface Hardware

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:
NOTE: The scale will transmit using the parity selected; however it does
not check the parity it receives.
Use an RS-232 cable to connect the external device to the scale, or
construct one following these instructions. 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 +5V @ 250 mA* (optional)
7 ground
8 ground
* If the fuse (Setra p/n 404722) is installed, power is provided for the
Auto Count 200 bar code option or an intelligent bar code wand (p/n
403676), CCD or laser scanner on pin 6.
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
connection between two pins on the computer's connector named DTR and
DSR (Data Terminal Ready and Data Set Ready) in order to communicate
with the scale. CTS (Clear to Send) may also need to be jumpered to RTS
(Request to Send) at your computer interface.
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.
Setra Quick Count™ Operator's Manual

RS-232 Serial Data Communications

Count comes equipped
1 start bit
8 data bits including parity
1 stop bit
10 bits per frame (framing errors ignored)
computers which
with a bidirectional
to connect it to the
8 1
Modular Jack
Connector
(in back of scale)
require handshaking

Appendix IV

RS-232
will need a
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