Nellcor OxiMax N-600X Operator's Manual page 127

Using the Data Port
3. Press the ANALOG softkey.
Selecting the 0 VOLT or 1 VOLT softkey causes that voltage to
appear at pins 6, 13, or 14 as referenced to ground pins 5 and 10.
Selecting the STEP softkey causes the voltage to increase from 0 to 1
th
volt at 1/10 -volt increments, with each step lasting at least 1 second.
Nellcor recommends that a qualified service personnel perform the
calibration of the attached device as described in the
N-600x Service Manual.
N-600x Operator's Manual 119