HEIDENHAIN ND 281 B v.2 - Manual (Page 40)

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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 1)
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
external signal (pin 6, low-level signal must be present
continuously). The setting selected with MOD or operating
parameter 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) of a new series of
measurements only by external signal over the switching
inputs.
Switching Inputs EXT (X41)
1) Only in linear measurement mode.