<s>
The	O
SSI	B-Protocol
protocol	I-Protocol
is	O
an	O
Application	B-Application
layer	I-Application
protocol	O
as	O
in	O
the	O
OSI	O
model	O
.	O
</s>
<s>
The	O
SSI	B-Protocol
protocol	I-Protocol
has	O
been	O
developed	O
jointly	O
by	O
Nokia	O
,	O
Vaisala	O
,	O
Suunto	O
,	O
Ionific	O
,	O
Mermit	O
and	O
University	O
of	O
Oulu	O
.	O
</s>
<s>
The	O
SSI	B-Protocol
protocol	I-Protocol
is	O
used	O
in	O
point-to-point	O
communications	O
over	O
UART	O
and	O
networking	O
nanoIP	O
applications	O
.	O
</s>
<s>
For	O
RFID	B-Application
sensor	O
tags	O
SSI	O
specifies	O
memory	O
map	O
for	O
sensor	O
data	O
.	O
</s>
<s>
The	O
criteria	O
for	O
SSI	B-Protocol
protocol	I-Protocol
development	O
are	O
:	O
</s>
<s>
Sample	O
implementation	O
of	O
the	O
SSI	B-Protocol
protocol	I-Protocol
for	O
MSP430	B-Architecture
microcontrollers	I-Architecture
will	O
be	O
published	O
as	O
open	B-License
source	I-License
during	O
August	O
2006	O
by	O
Nokia	O
.	O
</s>
<s>
'	O
,	O
0x3F	O
in	O
ASCII	B-Protocol
)	O
and	O
a	O
one	O
byte	O
message/command	O
type	O
.	O
</s>
<s>
An	O
SSI	O
UART	O
message	O
consists	O
of	O
a	O
3-byte	O
UART	O
header	O
,	O
an	O
SSI	O
message	O
as	O
the	O
payload	O
and	O
an	O
optional	O
Cyclic	O
redundancy	O
check	O
checksum	B-Algorithm
.	O
</s>
<s>
The	O
use	O
of	O
a	O
checksum	B-Algorithm
is	O
defined	O
by	O
the	O
SSI	O
message/command	O
type	O
,	O
with	O
lower	O
case	O
commands	O
indicating	O
the	O
use	O
of	O
CRC	O
.	O
</s>
<s>
In	O
a	O
typical	O
case	O
using	O
SSI	O
,	O
an	O
individual	O
message	O
is	O
not	O
important	O
,	O
and	O
so	O
nanoUDP	O
(	O
simplified	O
UDP	B-Protocol
defined	O
by	O
nanoIP	O
)	O
is	O
used	O
as	O
the	O
message	O
format	O
.	O
</s>
<s>
A	O
nanoUDP	O
message	O
consists	O
of	O
a	O
5-byte	O
nanoUDP	O
header	O
,	O
an	O
n-byte	O
message	O
payload	O
and	O
an	O
optional	O
2-byte	O
CRC	O
checksum	B-Algorithm
.	O
</s>
