UEIPAC HMI

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UEIPAC HMI


Overview

The UEIPAC is an embedded Linux based system

without any graphical interface.

It is very good at network connectivity which makes it

possible to create remote graphical user interfaces

(also known as HMI Human-Machine-Interface).


Client-Server

• Server typically runs on UEIPAC.

• Example: server acquires data and publishes

it for remote display(s)

• One or more client can connect to a server

• A HMI client written in C# can display data

acquired on UEIPAC in a chart

• A client can subscribe to variable updates

• The client gets notified only when variable

value change exceeds a given deadband


LibSharedData

• The shared data protocol is implemented in a

shared library

• Linux: libshareddata.so

• Windows: UeiSharedData.dll

• Both server and client(s) use the same shared

library to communicate.


UEIPAC

Application #1server

LibSharedData

UEIPAC

Applicationclient

LibSharedData

Application #2client

PC #2

Applicationclient

LibSharedData

PC #1

Web browser

LibSharedData


LibSharedData 1/2

Implements a simple message based

protocol (set/get variable) using JSON or

binary data representation

Local processes communicate over UNIX

sockets

Remote processes communicate over

TCP/IP sockets

Web browser communicate using Web

Sockets


LibSharedData 2/2

Variables are simply designated using a unique

name

Variable type can be a scalar or array of :

Int32

Int16

Int8

Double

Float


Protocol 1/3

Client or server sends a request to

libshareddata

put_value <name>=<value>

put_value_json <name>=<value>

get_value <name>

get_value_json <name>

subscribe_value <name>

Etc..


Protocol 2/3

Libshareddata implements a C API that hides

the protocol away

Bindings are available for C#, VB.NET, LabVIEW

and Python


Protocol 3/3

Web browsers can directly connect to remote

processes using web sockets and a little bit of

javascript programming.

Data can be displayed using standard HTML

controls or more advanced HTML5 ones


UEIPAC server example

Create Server:UeiSharedDataCreate("tcp://192.168.100.2:2345", &handle);

Acquire voltages:DqAdv207Read(hd, devn, clsize, cl, NULL, fdata);

Publish voltages:UeiSharedDataPut(handle, “voltages",

UeiSharedDataTypeDbl,

clsize, fdata);


Share Data Client

Shared Data client is an application that

provides a quick way to test a server.


C# client

Create a client objectUeiSharedDataClient client = new UeiSharedDataClient();

Open communication with serverclient.Open("tcp://192.168.100.2:2345");

Get shared variable valuedouble[] voltages = client.GetDouble(“voltages", 16);


C# client


LabVIEW client

Call VIs to open communication with server and

read “voltages” variable values


LabVIEW client


HTML5 client

Web sockets are part of HTML5. Supported in

the following browsers:

Google Chrome (fastest javascript engine)

Firefox

Safari for MacOS and iOS

Android web browser

Internet Explorer 10


HTML5 client There are many HTML5 UI library out there. Most

are business oriented, but are usable for

industrial applications

JQuery UI library provides a very easy way to

manipulate UI elements of a web page

UEIPAC comes with a default web page to view

shared data:

http://192.168.100.2:2345/shareddata.html


HTML5 client


SVG lab (still experimental)

A set of HTML5 UI controls for web based

scientific and industrial applications

Uses SVG (Scalable Vector Graphics) for

drawing

Use javascript for programming.

Chart

Slider

Maybe more...


Software

UEIPAC HMI