Measurement Computing USB-1602HS-2AO - Manual (Page 31)

USB-1602HS-2AO User's Guide Functional Details
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The setpoint conditions (criteria) and update modes are summarized below.
Setpoint criteria
Inside window The signal is below the 16-bit high limit (limit A) and above the 16-bit low limit (limit B).
Outside window The signal is above the 16-bit high limit (limit A), or below the 16-bit low limit (limit B).
Greater than value The signal is above the 16-bit low limit. The 16-bit high limit (limit A) is not used.
Less than value The signal is below the 16-bit high limit. The 16-bit low limit (limit B) is not used.
Equal to value The signal is equal to the 16-bit high limit. The 16-bit low limit (limit B) is not used.
This mode is intended for use when the counter or digital input channels are the source channel.
Only use this mode with counter or digital input channels as the channel source. To have similar
functionality for analog channels, use the inside window mode.
Hysteresis mode Outside the window high forces output 2 until an outside the window low condition exists, then
output 1 is forced. Output 1 continues until an outside the window high condition exists. This
cycle repeats as long as the acquisition is running in hysteresis mode.
Setpoint output channel
 None
 Update the upper 8-bits of the digital output port
 Update the analog output channels (DAC0, DAC1)
Update modes
 Update on True only
 Update on True and False
 None – Do not update
Setpoint values for output
 16-bit DAC value or the most significant byte (MSB) of the digital output port when the input does meets
criteria.
 16-bit DAC value or the most significant byte (MSB) of the digital output port when the input does not
meet criteria.
Note : When using setpoints with triggers other than immediate, hardware analog, or TLL, the setpoint criteria
evaluation begins immediately upon triggering the acquisition.
Examples of control outputs
Detection on analog input, DAC, and digital port MSB updates
Example 1:
Update mode: Update on True and False
Criteria: Channel 1 — below limit
In this example, channel 1 is programmed with reference to one setpoint (limit A), defining a low limit.
Channel Condition State of
detect signal Action
1 Below limit A
(for channel 1) True When the channel 1 analog input voltage is below limit A, update
DAC1 with the output value 0.0 V.
False When the above condition is false, update DAC1 with the output value
of minus 1.0 V.