AMX AXP-AI8 ANALOG 8-INPUT BOARD Manuale Utente Scaricare il pdf (Pagina 21)

DNA/DNR-AI-217 Simultaneous Sampling Differential Analog Input Board

Chapter 2 17

Programming with the High Level API

Tel: 508-921-4600 www.ueidaq.com Vers: 4.5

Date: April 2013 DNx-AI-217 Chap2x.fm

United Electronic Industries, Inc.

2.4 Configuring

the Timing

You can configure the AI-217 to run in simple mode (point by point) or high-

throughput buffered mode (ACB mode), or high-responsiveness (DMAP) mode.

In simple mode, the delay between samples is determined by software on the

host computer. In buffered mode, the delay between samples is determined by

the AI-217 on-board clock and data is transferred in blocks between PowerDNA

and the host PC.

The following sample shows how to configure the simple mode. Please refer to

the “UeiDaq Framework User’s Manual” to learn how to use other timing modes.

2.5 Open Circuit

Detection

The AI-217 can source a 100mA current through each input channel to detect

whether the circuit is close or open. This can be enabled on a per channel basis.

Use the AI channel object method "EnableOpenCircuitDetection()" to

turn on the feature on any input channel (0 to 15).

The example below shows how to turn on open circuit detection on all channels:

Once the session is started, you can retrieve the result of the open cicuit

detection with the channel object method "IsCircuitOpen()":

// configure timing of input for point-by-point (simple mode)

aiSession.ConfigureTimingForSimpleIO();

// turn on open circuit detection on all channels

for(int ch=0; ch<session.GetNumberOfChannels(); ch++) {

CUeiAIChannel* pChan =

dynamic_cast<CUeiAIChannel*>(session.GetChannel(ch));

pChan->EnableOpenCircuitTest(true);

}

// return if circuit is open

for(int ch=0; ch<session.GetNumberOfChannels(); ch++) {

CUeiAIChannel* pChan =

dynamic_cast<CUeiAIChannel*>(session.GetChannel(ch));

if(pChan->IsCircuitOpen())

{

std::cout << "Open circuit detected on channel " <<

pChan->GetIndex() << std::endl;

}

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AMX AXP-AI8 ANALOG 8-INPUT BOARD Manuale Utente Pagina 21