Advantech MIC-1810, User Manual

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MIC-1810 User Manual 28
3.9.2 Trigger Sources Connections
External Digital (TTL) Trigger
The MIC-1810 supports External digital (TTL) trigger to activate AO conversions for
continuous output mode. An external digital trigger event occurs when the MIC-1810
detects either a rising or falling edge on the External AO TTL trigger input signal from
the pin of connector. The user can define the type of trigger source as rising-edge or
falling-edge by software. The trigger signal is TTL-compatible.
Figure 3.14 External Digital Trigger Source Connection
Analog Threshold Trigger
For analog input operations, an analog trigger event occurs when the MIC-1810
detects a transition from above a threshold level to below a threshold level (falling
edge), or a transition from below a threshold level to above a threshold level (rising
edge). User should connect analog signals from external device or analog output
channel on board to external input signal ATRG0 and ATRG1. On the MIC-1810, the
threshold level is set using a dedicated 12-bit DAC. By software, you can program
the threshold level by writing a voltage value to this DAC; this value can range from
-10V to +10V.
Figure 3.15 External Analog Trigger Source Connection