AMX AXP-AI8 ANALOG 8-INPUT BOARD User Manual download pdf (Page 19)

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

Chapter 2 15

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.

Chapter 2 Programming with the High Level API

This section describes how to control the DNx-AI-217 using the UeiDaq Frame-

work High Level API.

UeiDaq Framework is object oriented and its objects can be manipulated in the

same manner from different development environments such as Visual C++,

Visual Basic or LabVIEW.

The following section focuses on the C++ API, but the concept is the same no

atter what programming language you use.

Please refer to the “UeiDaq Framework User Manual” for more information on

use of othe

r programming languages.

2.1 Creating a

Session

CUeiSession aiSession;

The Session object controls all operations on your PowerDNx device. Therefore,

the first task is to create a session object:

2.2 Configuring

the Resource

String

UeiDaq Framework uses resource strings to select which device, subsystem

and channels to use within a session. The resource string syntax is similar to a

web URL:

For PowerDNA and RACKtangle, the device class is pdna.

For example, the following resource string selects analog input lines 0,1,2,3 on

device 1 at IP address 192.168.100.2: “pdna://192.168.100.2/Dev1/Ai0:3” as a

range, or as a list “pdna://192.168.100.2/Dev1/Ai0,1,2,3”.

2.3 Configuring

the Input

This section will show you how to configure your input for voltage measurement,

thermocouple measurement, or RTD measurement.

2.3.1 Voltage

Measurement

The gain applied on each channel is specified by using low and high input limits.

For example, the AI-217 available gains are 1, 2, 4, 8, 16, 32, 64 and the

maximum input range is [-10V, +10V (gain = 1)].

To select the gain of 1, you need to specify input limits of [-10V, +10V]:

// create a session object for input

// Configure channels 0,1 to use a gain of 1 in differential mode

aiSession.CreateAIChannel(“pdna://192.168.100.2/Dev0/Ai0,1”,

-10.0, 10.0,

UeiAIChannelInputModeDifferential);

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