OptoTest OP940-SW Instruction Manual page 29

Front Panel Operation
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Scan Offset is a global setting which controls where the unit
begins referencing for return loss. This is useful if one needs to
reference past optical components
DUT Length is a global setting which allows the operator
to specify how far from the front panel the return loss
measurements will be taken to preserve the accuracy of the
results
Startup Mode is a global setting which allows the operator to
specify which Operation Mode to load each time the unit is
powered on
Enabling the external 2x2 switch controls will put the OP940 into
Bidirectional Mode and allow it to send commands to an OP725.
Disabling this setting allows the unit to work as a unidirectional
OP940
The Temperature Units setting allows the operator to specify
whether they would prefer the unit to display the ambient
temperature in Celsius or Fahrenheit
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OP940-SW