Tibbo DS100 Istruzioni operative

VB Tutorial

Tibbo

TECHNOLOGY

Using Visual Basic (VB) to communicate with the

DS100 and EM100

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Version: 2.0a

Tibbo Technology, Inc. 2001, 2002

Table of Contents

1. Introduction 3

1.1. What is WinSock? 3

1.2. Required tools 3

2. Preparing the DS100/EM100SK 4

2.1. Connecting cables 4

2.2. Choosing an IP-address 5

2.3. Installing the HyperTerminal 7

2.4. Setting up the HyperTerminal 8

2.5. Setting up the DS100/EM100SK 9

2.6. Testing the LAN link 10

3. Creating the WinSock Demo 12

3.1. WinSock Demo action plan 12

3.2. Step 1: creating a simple UDP/IP Demo 12

3.3. Step 2: learning to control the DS100/EM100 over the network 15

3.4. Step 3: TCP/IP communications 18

1. Introduction

1.1. What is WinSock?

WinSock ActiveX control is a part of a standard Visual Basic 6 (VB6) distribution. WinSock dramatically

simplifies the development of TCP/IP-based applications. Since the DS100 Serial Device Server and the

EM100 Ethernet Module from Tibbo Technology support standard UDP and TCP protocols the WinSock

can also be used to build applications that communicate with and control the DS100 and EM100.

This Tutorial provides step-by-step instructions on using VB to create three rudimentary programs

(called “WinSock Demos”) that communicate with and program the DS100/EM100 over the network. The

Demos are not a complete fully-functional programs but rather a “templates” that show you the basic steps

of building your own applications with the WinSock. Complete VB projects for each WinSock Demo (packed

into a ZIP archives and named “WinSock Demo Step1”, “WinSock Demo Step2”, and “WinSock Demo

Step3”.) can be downloaded from www.tibbo.com/downloads.htm.

1.2. Required tools

• DS100 Serial Device Server or EM100SK Starter Kit

• WAS-1455 or similar serial cable to connect the DS100/EM100 to the PC*

• WAS-1498 or WAS-1499 Ethernet cable may be needed to connect the DS100/EM100 to the LAN*

• Power adaptor (220V or 120V depending on your locality)*

• Windows PC with one unused Serial port and an Ethernet port

• Visual Basic 6.0 from Microsoft

• HyperTerminal for Windows (part of a standard Windows distribution)

*These accessories are supplied with the DS100-KIT and EM100SK Products.

2. Preparing the DS100/EM100SK

2.1. Connecting cables

To test out the WinSock Demos you will need to connect the Ethernet port of the DS100/EM100SK to

the LAN (to which your test PC is also connected), and the RS232 port- to the PC’s COM port. Our WinSock

Demos will communicate with the DS100/EM100SK directly via the Ethernet (which is a TCP/IP network).

RS232 side of the link will be served by the HyperTerminal- a standard Windows software used to send and

receive the serial data.

Assembly the network as follows (Fig. 1):

• Connect the RS232 port of the DS100/EM100SK to the unused Serial port of your PC with the

WAS-1455 serial cable

• Connect the Ethernet port of the DS100/EM100SK to your office LAN or directly to your PC using

the WAS-1499 or WAS-1498 cable (see below for more information)

• Power the DS100/EM100SK up using the power adaptor.

There are two ways to connect the Ethernet side of the DS100/EM100SK to the PC:

• Via LAN. If you have a LAN installed in your office and your PC is already connected to this LAN,

then you will need a spare cable (coming out of the network hub) to connect the DS100/EM100SK.

If no spare cable is readily available, then our WAS-1499 Device-to-Hub cable can be used. Plug

one side of the cable into the unused 10BaseT connector on your hub, another one- into the

DS100/EM100SK Ethernet port

• Directly. You can bypass the LAN and the Hub using our WAS-1498 Device-to-Device cable. Plug

one side of the cable into your PC’s Ethernet port (yes, you need to disconnect your PC from the

office network first), another side- into the Ethernet port on the DS100/EM100SK.

Note: The Ethernet port of the DS100/EM100SK is of 10BaseT type, not 100BaseT. You can use the

DS100/EM100SK on “10” or “Auto 10/100” LANs, but not on “100” LANs.

WinSock

Demo Hyper

Terminal

COMLAN

WinSock

Demo Hyper

Terminal

COMLAN

Test PC

Connecting via Hub Connecting directly

Test PC

Hub WAS-1455 WAS-1455

WAS-1499

WAS-1498

DS100 DS100

Fig. 1. Test arrangement

2.2. Choosing an IP-address

Each DS100/EM100 you use must be assigned a network-unique IP-address. Most LANs have

restrictions on the range of permitted IP-addresses, so you cannot just use any random address. One

reliable way to obtain a “good” IP-address is to ask your IT guy ☺. If there is no such person in your building

then you can follow this (many times proven) method:

• Use our WAS-1498 cable to directly connect your PC to the DS100/EM100SK. This way you will

disconnect from the rest of the LAN (a lot of possible problems will be cut out…)

• Use the WINIPCFG program to find out the IP-address of your PC (see explanation below). In 99%

of cases, choosing the address for the DS100/EM100SK that differs slightly from your PC’s IP-

address in the last digit produces a workable result. That is, if your PC’s address is 192.168.100.39

then choosing 192.168.100.40 for your DS100/EM100 will most probably work fine!

Using WINIPCFG to find out the IP-address of your PC

Fig. 2. WINIPCFG window

• Choose Run… from the Start menu of Windows- the Run dialog will open

• Type winipcfg into the Open textbox and press OK- the WINPCCFG dialog will open

• From a drop-down box at the top of the dialog select a network adaptor that is used to connect your

PC to the Ethernet network. All available adaptors are listed by their actual model number. Usually

there is only one Ethernet adaptor in the PC so you need to find some line with the word “Ethernet”

in it. For example if the drop-down box contains two entries: “PPP Adapter” and “D-Link DFE-

530TX PCI Fast Ethernet Adapter” then you know which one you need to choose, right ? (just in

case, it is the second one).

• After you have selected correct adapter note an IP-address displayed below and click OK- the

dialog will close

• Choose an IP-address that is close to the one set for your PC. Procedures below assume that this

new IP-address is 192.168.100.40.

2.3. Installing the HyperTerminal

One side of the test link we are building is served by (as yet to be created) a WinSock Demo program,

another one- by a standard serial communications software called HyperTerminal. This program is also used

here to setup the DS100/EM100SK. Actually, there is a setup software called DS Manager (part of Tibbo

Device Server Toolkit available for download from www.tibbo.com/downloads.htm) that can be used to setup

the DS100/EM100SK. However, we are deliberately choosing to make you type all the setup commands

manually. This way you will familiarize yourself with the structure and use of actual commands sent to the

DS100/EM100SK. Later in this Tutorial we will show you how to setup the DS100/EM100SK through the

network so the knowledge of programming commands will be quite handy!

The HyperTerminal is normally found in the Start

Programs

Accessories

Communications

HyperTerminal folder. If it is not there, then you must have opted it out when installing Windows on your PC.

Follow the instructions below to add HyperTerminal to your system (be sure to have your Windows

distribution CD handy!):

• Go to the Control Panel (Start

Settings

Control Panel) and double-click on the Add/Remove

Programs icon- the Add/Remove Programs dialog will open

• Click on Windows Setup tab to view the list of optional installation components

• Choose Communications in the Components list and click Details

• In the Communications window, select the HyperTerminal (it must be “checked”)

• Press OK to close Communications window, press OK again to close Add/Remove Programs

• You will possibly be asked to insert the Windows CD at this point. Do this and follow the

instructions on the screen.

2.4. Setting up the HyperTerminal

Once the HyperTerminal is installed (or found ☺), launch it and follow the procedure below:

• When the Connection Description dialog opens, type any descriptive string (like “DS100”) and

press OK

• When the Connect to dialog opens, select an appropriate COM port from the Connect Using drop-

down box (for example, “Direct to COM1”)

• When the COM Properties dialog appears, set communications parameters as follows: Bits per

second: 38400, Data bits: 8, Parity: None, Stop bits: 1, Flow control: None. Click OK when done-

the HyperTerminal’s main window will appear

• Choose File

Properties from the Main menu- the Properties dialog will open

• Click on the Settings tab and press the ASCII Setup button- the ASCII Setup dialog will open

• “Check” (enable) three options: Echo typed characters locally, Send line feeds with line ends, and

Append line feeds to incoming line ends

• Click OK twice to close both dialogs

• Optional (but strongly recommended): you may want to Save (File

Save in Main menu) this

HyperTerminal configuration so that you don’t have to set all the parameters again in the future!

• Connect the power to the DS100/EM100SK and wait until it enters the Normal mode (Red and

Green Status LEDs blink three times)

• Push the Setup Button (it is on the back of the DS100 and on the PCB of the EM100SK) - both

Status LEDs will start blinking (Red-Green-Red-Green-…)- the DS100 is now in the Serial

Programming mode (read all about it in Section 4.2. of the DS100 Tech Manual)

• Try this command: in the HyperTerminal’s window press <Ctrl-B> (to mark the beginning of a new

command packet; the character on the screen will look like a smiley face), then capital “V” , then

<Enter>. The DS100 will respond with its firmware version string:

☺V

☺A<V2.20>

Input all other commands is a similar way: start every command with a <Ctrl-B> and finish it off by

pressing <Enter>. Note, that you cannot correct input errors by pressing <Backspace>, <#

#>, etc. If you’ve

made a mistake you have to start the whole command over again (press <Ctrl-B>, etc.).

2.5. Setting up the DS100/EM100SK

To make sure that all the Settings of the DS100/EM100SK are correct you are advised to initialize the

DS100 first. This will bring the DS100 back to its default factory state. After that, you only need to change

one Setting: IP-address of the DS100. Procedure below assumes that the desired IP-address is

192.168.100.40:

☺I /you initialize the DS100/EM100SK

☺A /OK

☺SIP192.168.100.40 /you set new IP-address

☺A /OK

☺GIP /you verify new IP-address

☺A192.168.100.40 /yes, it is 192.168.100.40

After the initialization the DS100 is set to work in the Slave Routing Mode, with the UDP/IP

communications protocol. The data exchange is to be effected with Data Port #1001.

OK, now disconnect the DS100’s power and then connect it again- the unit will resume operation with

the new functioning parameters.

Do not exit the HyperTerminal at this time- you will need it to exchange the data with the WinSock

Demo.

2.6. Testing the LAN link

Final step before we start creating the Demo is to make sure that your PC can “find” the

DS100/EM100SK on the network. Use PING program to check this:

• Choose Run… from the Start menu of Windows- the Run dialog will open

• Type ping 192.168.100.40 into the Open textbox and press OK

• The ping program will send four messages to the DS100/EM100SK. If there is no reply from the

DS100/EM100SK then the program output will look like this:

Pinging 192.168.100.40 with 32 bytes of data

Request timed out.

• If the DS100/EM100SK does reply to your PC’s “pinging” then the output from the ping program will

look somewhat like this:

Pinging 192.168.100.40 with 32 bytes of data

Reply from 192.168.100.40: bytes=32, time=9ms, TTL=255

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