direct numerical control

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

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

8. 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

9. 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).

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

11. 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).

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

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

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

15. Connection and Taking :

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

17. 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

18. Bluetooth Networks :