35
Instrument Operation
Signal Pin Direction
+5V DC 1 to reader
receive data 10 from reader
gnd/earth 9 common
Table 2: Barcode Port Connections
A suitable barcode scanner is available from Advanced Instruments. To
interface with the 3250, the barcode scanner must be programmed as
follows, referring to the scanner users guide.
• 1200 bps
• CR suffix
• disable beep after good decode
• triggerless trigger mode (optional)
Sample preparation
No special sample preparation is required. Body fluids such as serum or
plasma may be used directly.
Note Additives such as anticoagulants from collection tubes may
contribute significantly to the measured osmolality.
Particulate matter and certain bacteria can also cause premature
crystallization; in blood, it is normally eliminated by centrifugation.
Particulate matter in urine may be removed by centrifugation or
filtration through an inert filter.
Sample handling
Different sample tube sizes and styles should not be intermixed
because each may require a different instrument adjustment and/
or calibration. Sample tubes should be as uniform as possible in
composition, shape and size. For optimum results, you should always
use 3LA825 sample tubes.
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