User`s guide

Operation Theory

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4.5 Trigger Sources

ADLINK provides flexible trigger selections in the DAQ-2213/2214. In ad-

dition to the internal software trigger, DAQ-2213/2214 also supports ex-

ternal analog, digital triggers and SSI triggers. Users can configure the

trigger source by software for A/D processes.

4.5.1 Software-Trigger

This trigger mode does not need any external trigger source. The trigger

asserts right after executing the specified function calls to begin the op-

eration.

4.5.2 External Analog Trigger

The analog trigger circuitry routing is shown in the Figure 39. The analog

multiplexer could select either a direct analog input from the EXTATRIG pin

(SRC1 in Figure 39) on the 68-pin connector CN1 or the input signal of

ADC. (The first channel input filled in the Channel Gain Queue.) SRC1 can

be used for all trigger modes while SRC2 can only be used for post and

delay trigger modes. The range of trigger level for SRC1 is ±10V and the

resolution is 78mV (please refer to Table 13, the valid code range is from 1

to 255), while the trigger range of SRC2 is the full-scale range of the first

channel input in Channel Gain Queue, and the resolution is the desired

range divided by 256. For example, if the first channel input in Channel

Gain Queue is CH0 with bipolar ±5V range, the trigger voltage would be

4.96V when the trigger level code is set to 0xFF while –4.96V when the

code is set to 0x01.

n = 0, ...,15

Instrumentation

mplifier

Converter

Input Multipexer

CN1

MUX

Analog

Trigger

Circuit

EXTATRIG

SRC1

SRC2

Figure 39: Analog trigger block diagram