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Advanced
™
Osmometer Model 3250 User’s Guide
If the SETUP or CALIB key is pressed while the Supervisor/ Operator
keyswitch is in the Operator position, a Supervisor Key Needed; Press
STOP to Continue message is continually scrolled across the display
until STOP is pressed. When STOP is pressed, the message will change
back to Ready, re-enabling the sample test function.
Power module (Figure 5)
The power module on the rear of the instrument contains the following
components.
• Power switch
The rocker-style power switch controls the power to the instrument.
The power switch may be left on continuously; the 3250 enters
standby mode automatically if idle for more than 5 minutes.
• Power cord connector
The power cord connector accommodates a power cord suitable for
the power available.
• Fuse holder
The fuse holder contains the instrument’s necessary fuses. For
instructions on replacing fuses, see Chapter 5.
RS-232 port (Figure 5)
The RS-232 port allows you to output your instrument’s data/
messages to an external device, such as a computer. For more detailed
information dealing with the RS-232 port, please read the section titled
Using the RS-232 port, which is found later in this chapter.
Barcode port (Figure 5)
A D-type, 15-pin barcode port is provided in the back of the 3250 for
connecting and providing power to such a device. For proper operation,
the barcode port requires a 1200 bps, RS232-level signal providing
asynchronous serial data containing 1 start bit, 8 data bits, 1 stop bit
and no parity.
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