Intelligent Motion Systems UDAS-1001E - Manual (Page 14)

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The scanner operates with the built-in analog channels, or with the optional AI-MAX. The AI-
MAX allows up to 256 analog input channels to be connected to a single UDAS device.
High-Speed Analog Input Triggering High-Speed Analog Input Triggering
To start or stop conversions, use triggering in the High-Speed Analog Input mode in the UDAS
device. The trigger signal can be either an analog input or a digital input.
When using an analog input as the trigger, the start on trigger mode causes the scanner to start
on the trigger channel. For example, if the trigger channel is set to 5, the N channel of the 0 to N
scanner is set to 7, the return data is as follows:
channel 5
channel 6
channel 7
channel 0
channel 1
...
channel 7
channel 0
...
When using the stop on trigger mode and the trigger is from an analog input channel, the trigger
signal is sampled only when the trigger channel is the active scanner channel. Although this
allows any channel to be used for triggering, it imposes some restrictions on the characteristic of
the trigger signal.
The duration of the trigger signal must be long enough to cause the unit to trigger. Use the
following formula to calculate the length of a signal to ensure that the signal is long enough to
activate the trigger: (Total channels scanned)/(scan rate in Hz).
Note:
The scanner begins on the selected trigger channel and not channel 0 when the
start on trigger mode is used with an analog input trigger.