Measurement Computing USB-1616HS-2, User Manual, Page: 36 / 54

USB-1616HS-2 User's Guide Functional Details
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A channel's detect signal shows a rising edge and is True (1) when the channel's data meets the setpoint criteria.
The detect signal shows a falling edge and is False (0) when the channel's data does not meet the setpoint
criteria. The True and False states for each setpoint criteria are explained in the " Using the setpoint status
register " section on page 38.
Criteria
– input signal is equal to X
Action - driven by condition
Compare X to: Setpoint definition (choose
one) Update conditions:
Limit A or
Limit B

Equal to A (X = A)

Below A (X < A)

Above B (X > B)
True only:

If True , then output value 1

If False , then perform no action
True and False :

If True , then output value 1

If False , then output value 2
Window*
(non-hysteresis
mode)

Inside (B < X < A)

Outside ( B > X; or, X > A)
True only

If True , then output value 1

If False , then perform no action
True and False

If True , then output value 1

If False , then output value 2
Window*
(hysteresis
mode)

Above A (X > A)

Below (A < X < B) (Both
conditions are checked when
in hysteresis mode
Hysteresis mode (forced update)

If X > A is True , then output value 2 until X < B is True , then
output value 1.

If X < B is True , then output value 1 until X > A is True , then
output value 2.
This is saying:
(a) If the input signal is outside the window high , output value 2 until
the signal goes outside the window low, and
(b) if the signal is outside the window low , output value 1 until the
signal goes outside the window high . There is no change to the detect
signal while within the window.
The detect signal has the timing resolution of the scan period as seen in the diagram below. The detect signal
can change no faster than the scan frequency (1/scan period.)
Figure 25. Example diagram of detection signals for channels 1, 2, and 3
Each channel in the scan group can have one detection setpoint. There can be no more than 16 total setpoints
total applied to channels within a scan group.