PCIE-1816_1816H User Manual 24
Analog Threshold Trigger
For analog input operations, an analog trigger event occurs when the PCIE-1816/
1816H 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 out-
put channel on board to external input signal ATRG0 and ATRG1. On the PCIE-1816/
1816H, the threshold level is set using a dedicated 16-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 3.8 External Analog Trigger Source Connection
Analog Output Connection
The PCIE-1816/1816H provides two AO output channels. You can use the internal
precision -5 V or -10 V reference to generate 0 to +5 V or 0 to +10 V AO output. Use
an external reference for other AO output ranges. The maximum reference input volt-
age is ±10 V and maximum output scaling is ±10 V. Loading current for AO outputs
should not exceed 5 mA.
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