Hengstler Signo 721.2 User Manual page 122

5 Describtion of the counter
Prescaler output:
Application Keylock:
Our Tip:
After setting up the system, lock all the keyboard functions that are not allowed
to be changed by the user.
The prescaler output is an application output.
With each increase of the counter reading the number of output pulses corresponds to the
respective number of increments.
The pulse length of the prescaler output corresponds to a frequency of1,5 kHz.
When using the prescaler output the max. count frequency is:
F max = 1500 / PSC.
So it is possible that the maximum input frequency can not be reached.
All keyboard functions can be locked (latched) individually
(Reset, Preset 1, Preset 2, Prescaler, correction value)
Lock mode: complete keylock or
Keylock depending on keylock-input (application input)
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