1.
DNC and Bluetooth
Ahmad Bashar Ataji

2.
What is DNC ?
 DNC = Direct numerical control.
 Prospering with the success of CAD/CAM
with 3D contours.

3.
Why DNC ?
 Huge file sizes.
 So limited memories for CNCs.
 Without DNC, files are spoon-fed.

4.
DNC Overview :
 DNC PC
 CNC Machine
 Connection

5.
DNC Overview (cont):
 CAD/CAM workstation

6.
DCN (Direct CNC Networking) :
DNC
 Two different networks
DCN
 One network

7.
Bluetooth Fundamentals :
 Harald bluetooth king of Denmark in the
late 900s
 Bluetooth 1.0 has 1Mbps maximum
 Bluetooth 2.0 has 3Mbps maximum
 It is a radio-frequency standard

8.
Bluetooth Technology :
 It uses low power waves about 1 milliwatt.
 Its range is 10m.
 It can connect 8 devices simultaneously.
 It uses SS-FH technology.
 It uses ISM frequency band (between
2.402GHz and 2.48GHz).

9.
SS-FH Technology :
 SS-FH = Spread Spectrum Frequency
Hopping.
 A device randomly uses one of 97
frequency band.

10.
SS-FH Technology (cont):
 The transmitting device changes
frequency 1600 times every second.
 Interference will be small and over short
period of time.
 The random change in frequency is done
in regular way (using generative codes).

11.
Building Bluetooth network
(piconet) :
 It uses master/slave.
 Building piconet is divided into steps:
Inquiry.
Page.
Connecting.
Talking.

12.
Inquiry :
 Each unit has an
address.
 Each master has a
range of addresses.
 Master asks for
response from units in
range.

13.
Page :
 Master and each
slave agree on the
connection properties.

14.
Connection and Taking :

15.
What Bluetooth has to do with DNC
 Replacing the serial
connection by using a
Bluetooth adapter.

16.
Industrial Bluetooth network :
 This networks are build over two levels
Piconets
Industrial nets
 Piconets are build by replacing the master
with an access point. This access point is
the gateway between the Ethernet and the
piconet

17.
Bluetooth Networks :