<s>
Wireless	B-General_Concept
DNC	I-General_Concept
is	O
a	O
form	O
of	O
wireless	B-Architecture
data	O
transfer	O
,	O
known	O
as	O
Direct	O
Numerical	O
Control	O
,	O
performed	O
between	O
a	O
computer	O
numerical	O
control	O
(	O
CNC	O
)	O
machine	O
and	O
the	O
computer	O
controlling	O
it	O
.	O
</s>
<s>
This	O
list	O
of	O
instructions	O
is	O
stored	O
in	O
a	O
computer	B-Language
script	I-Language
,	O
a	O
computer	O
file	O
written	O
in	O
a	O
programming	O
language	O
,	O
such	O
as	O
G-code	O
.	O
</s>
<s>
When	O
a	O
part	O
is	O
to	O
be	O
produced	O
this	O
part	O
program	O
is	O
uploaded	B-Application
to	O
a	O
CNC	O
machine	O
by	O
RS-232	O
link	O
.	O
</s>
<s>
Hence	O
wireless	B-Architecture
data	O
transfer	O
has	O
come	O
into	O
existence	O
.	O
</s>
<s>
There	O
are	O
mainly	O
two	O
types	O
of	O
wireless	B-Architecture
hardware	O
units	O
available	O
in	O
the	O
market	O
.	O
</s>
<s>
One	O
is	O
using	O
Bluetooth	B-Protocol
technology	I-Protocol
,	O
while	O
the	O
other	O
uses	O
Wi-Fi	O
technology	O
.	O
</s>
<s>
In	O
case	O
of	O
Bluetooth	B-Protocol
,	O
generally	O
one	O
pair	O
of	O
Bluetooth	B-Protocol
devices	O
is	O
used	O
.	O
</s>
<s>
The	O
wireless	B-Architecture
link	O
is	O
established	O
with	O
the	O
required	O
driver	O
software	O
.	O
</s>
<s>
In	O
Wi-Fi	O
technology	O
,	O
a	O
wireless	B-Architecture
link	O
is	O
established	O
between	O
a	O
device	O
called	O
wireless	B-Device
access	I-Device
point	I-Device
(	O
generally	O
near	O
the	O
PC	O
)	O
and	O
a	O
device	O
called	O
a	O
wireless	B-Architecture
node	O
,	O
which	O
is	O
interfaced	O
to	O
the	O
CNC	O
machine	O
.	O
</s>
<s>
Each	O
wireless	B-Device
access	I-Device
point	I-Device
and	O
wireless	B-Architecture
node	O
has	O
one	O
IP	O
address	O
.	O
</s>
<s>
Thus	O
a	O
wireless	B-Architecture
Ethernet	O
link	O
is	O
created	O
.	O
</s>
<s>
The	O
wireless	B-Architecture
node	O
has	O
an	O
RS-232	O
port	O
,	O
which	O
is	O
connected	O
to	O
an	O
RS-232	O
port	O
of	O
the	O
CNC	O
machine	O
.	O
</s>
<s>
Driver	O
software	O
on	O
the	O
PC	O
maps	O
the	O
RS-232	O
port	O
of	O
the	O
wireless	B-Architecture
node	O
as	O
a	O
virtual	O
COM	O
port	O
of	O
the	O
PC	O
.	O
</s>
