Trigger Source Connections - Advantech MIC-1816 Series User Manual

2.8.2

Trigger Source Connections

External Digital (TTL) Trigger
MIC-1816 supports the use of an external digital (TTL) trigger to activate AO conver-
sions for continuous output mode. An external digital trigger event occurs when MIC-
1816 detects either a rising or falling edge on the external AO TTL trigger input signal
from the pin of connector. Users can define the trigger source type as rising edge or
falling edge via software. The trigger signal is TTL compatible.
Figure 2.14 External Digital Trigger Source Connection
Analog Threshold Trigger
For analog input operations, an analog trigger event occurs when MIC-1816 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). Users
should connect analog signals from an external device or analog output channel on
board to external input signals ATRG0 and ATRG1. For MIC-1816, the threshold
level is set using a dedicated 16-bit DAC. The threshold level can be programmed by
writing a voltage value to this DAC using software. The voltage value can range from
-10 V to 10 V.
Figure 2.15 External Analog Trigger Source Connection
MIC-1816 User Manual 22