Teledyne API T803 CO2/O2 Analyzer Operation Manual Communications Setup and Operation
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6.2.3. COM PORT TESTING

The serial ports can be tested for correct connection and output in the COM
menu. This test sends a string of 256 ‘w’ characters to the selected COM port.
While the test is running, the red LED on the rear panel of the analyzer should
flicker.
To initiate the test press the following button sequence.
07276B DCN6418