CCNCCNCentral Control Network

Part A presentation

Winter & Spring 2002/03

Student : Kormas Tal

Guide : Gerber Alex

CCNCCN - motivation

• Many systems around the world use central computer for

security devices (such as entrance and security

cameras).

• Most of the devices are low resource requires and so

many could be connected to one computer.

• We would like to take advantage of the USB port speed

and availability, and implement multiple area network (a

separate bus for each area) connected to it.

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CCN - functional

Devices

Data base

Internet

Users

Future

USBHUB

תורFIFO

עם זכרון

CAN BUS

CAN to USB & Can Master

CCNCCN – block diagram view

אלמנט תקשורת

ושליטה

Nice for a future projectFuture

CCNCCN – main idea• Each device uses bus interface to connect a CAN bus.

• Each level/area have it’s own bus.

• All buses controlled by a master device, which also

convert the CAN protocol into USB protocol.

• All the Can Masters outputs (USB) are connected to a

USB Hub (which is power supplied, so the net will keep

working when communication to the computer N/A).

• The hub connected to a memory unit for keeping the

data in a FIFO line if the computer is down.

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CCN – main idea (cont)• The data from the devices is inserted to a Database on the

computer side.

• The users connect to the computer and login. Each user

have links to is devices.

• The user can look on the data received from his device and

configure them, according to his permissions.

• As a conclusion : The project is a very interconnected with

other devices, both networked (CAN/TCP/USB) and both

functionality (door opener/cameras and etc.)

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CCN - Interfaces

• There are 3 main interfaces on this project:

1) devices interface with the network bus

using CAN protocol (ISO/IS 11898-2 )

2) buses interface with the PC using USB

protocol.

3) users interface with the PC and data using

TCP/IP protocol.

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CNN – spec

• Since CAN bus can support 1024 devices, and it’s

throughput is 125KB/sec.

• And Since USB 1.1 (slow) can support 12MB/sec.

• And Since there is no limit to hub usage.

• We could support up to about 100 full buses (or more if

it’s not full).

• TCP/IP rates are network based (since each user could

be connected in a different speed).

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CCN - Software

אחד תהליכונים:2התוכנה הבסיסית כוללת •הוא הראשי והמאתחל, השני הוא המאזין על ה

USB.

עבור כל הודעה שמתקבלת נפתח תהליכון •חדש, לטיפול בהודעה הזו.

אותו תהליך בודק את המידע שהתקבל ומבצע •את הפעולות שהוגדרות עבור קבלת המידע ע"י

אותו רכיב (ע"י קריאה ממסד הנתונים).

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CCN – Devices1. Input : CAN packet p (this will be done one thread for 1 packet)

2. IF p.data.cont then

3. Act recording to the data(add/remove).

4. ELSE

5. db.(p.dev).data(time) = p.data

6. if(irreg(db.(p.dev))) do db.(p.dev).irlist

7. else if(ok(db.(p.dev))) do db.(p.dev).oklist

8. else do db.(p.dev).failist

9. End if

10. return

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CCN – Devices databaseDatabase for device contains the following data for each:

1. device name

2. Device type

3. configures (i.e. good time, legal users list)

4. list of devices for irregularities.

5. list of devices for legal operations

6. list of devices for illegal operations.

7. What data is considered good.

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CCN – log Database

Each line at the log has:

• Device ID

• Device name

• Time

• Irregularly flag

• OK flag

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CCN – implementation notes

• The computer OS: windows 2000

• I’m using C# to implement the software, and Microsoft

SQL Server for the database.

• I’ll use the SQL server to also log the operation made by

the users for the administration side.

• NOTE : there is special user “admin” which will have a

different kind of page, and could control all users and

devices. He is the manager of the system.

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CCN – course of development• First I had to verify that the master device works

properly. It took some time to understand it’s demo program.

• Then developing the software on C# was needed, and this was problematic.

• Connected the bus with the SQL.• Wrote a program for simulating 2 clients on the bus.• Connected a PIC device to the bus and check

working with it.• Developing CANopen layer for the program (only

PDO). This is done with Konstantin, and not yet completed.

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CCN – Test Spec

• The project was checked using a know working devices.

• One CAN bus was used.

• It had 2 devices connected to the bus.

• Data was received and translated correctly. The data

received from the package, is causing a correct data

fetch for the device who sent it, and followed by a correct

sequence (O.K / Fail / Irregularity)

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CCN – Software checks

I’ve checked my software as follow:1) Devices work : checked that I get the

messages on the bus from a debugger connected to the bus.

2) Database insertion work: checked that when a device message receive, it’s inserted to the right place on the database.

3) Data decision work : checking correct time, check if the data correct. I’ve checked 2 different devices, with all the possibility groups (OK / Fail / Irregularity)

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CCN – what already done

הפרוייקט אופיין•

תיאור התוכנה הושלם•

צבירת ידע בשפת התכנות ורקע בנושא מסדי •נתונים.

הוכנו מצבורי ידע בנושאי התוכנה (כמו הגנת •אתרים וכו').

יחיד Can Busנכתבה ונבדקה התוכנה עבור •(עם מספר אלמנטים) וללא משתמשים.

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מה למדתיNet. ובסביבת פיתוח #Cראשית למדתי להשתמש ב •

.#C לשפת ++Cלמדתי להמיר קוד משפת •

למדתי כיצד עובד קישור ספריה דינמית עבור פונקציות להעתקת •

classes.או זכרון

, כיצד להגדיר ולשנות הגדרות של SQLלמדתי כיצד לכתוב שאילתות ב •

טבלה.

.concurrency וtransactionsלמדתי ליישם את החומר הנלמד לגבי •

השתמשתי בחומר התאורתי לצורך יישום וחשיבה על פרוטוקול •

CANopen לעומת פרוטוקול PCI (פרוטוקול דמוי busהתקשורת על ה

וכו).

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CCN – why not…

• Why not single user?

Single user cannot secure a large site, we want to

allow more users, each securing a smaller area.

• Why not single bus?

Single bus won’t allow large number of devices, and

we’ll be limited by CAN max throughput.

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CCN – why not…(cont)

• Why using hub?

since we are limited on the number of USB’s

connectors to a single computer -> HUB.

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CCN – Next Step

)CANopenיש לסיים את מימוש הפרוטוקול (•

.USB Hubיש להזמין •

למערכת ולהרחיב את busesיש להוסיף עוד •התוכנה לתמוך בכולם.

יש לכתוב את התוכנה עבור משתמשים.•

יש לבדוק את המערכת השלמה ולהוסיף עליה •הגנות (נגד פריצה).

CCN – part 2 timetable10.4.03 : סיום מימוש הפרוטוקול •

Buses : 31.4.03 ו Hubהוספת •

31.5.03 כתיבת התוכנה עבור המשתמשים :•

31.6.03 סיום של כל הבדיקות, הוספת ההגנות וכו':•

20.7.03: עד ה הגשת הפרוייקט •