HEIDENHAIN NPD 281 v.3 - Manual (Page 37)

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Switching Inputs EXT (X41)
Setting and zero resetting the display
With an external signal, you can set the display to the value
selected in parameter P79 (pin 3) or reset each axis to zero (pin 2).
Enabling and disabling REF mode
Operating parameter P85 allows you to activate the input
(pin 25) which will be used for setting the display externally
to REF mode when the unit is switched on or when the
power is restored after an interruption. The next signal
deactivates REF mode again (switchover function).
Ignoring reference mark signals
If this input (pin 4) is active, the display will ignore all
reference mark signals. A typical application of this function is
for measuring lengths with a rotary encoder and spindle; in
this case, a cam switch releases the reference mark signal at
a preset position.
Externally selecting MIN/MAX
Starting a series of measurements
Switching the display between MIN/MAX/DIFF/ACTL
You can activate the operating mode for finding minimum and
maximum values from a series of measurements with an ex-
ternal signal (pin 6, low-level signal must be present con-
tinuously). The setting selected with MOD or operating pa-
rameter P21 is disabled. You can switch to MIN/MAX/DIFF/
ACTL display (pins 7, 8, 9, low-level signal must be present
continuously) and START (pin 5, Pulse) a new series of meas-
urements only by external signal over the switching inputs.