Visa källa för RF Protokoll - Nexa/Proove (äldre, ej självlärande)

== The NEXA/PROOVE Remote Protocol ==


The RF remote control transmitters/receivers from NEXA and PROOVE seems 
to originate from ARC Technology Co Ltd, Taiwan. There are several versions 
of these products but they seem to share the same protocol.

Bit representation
------------------
The bit coding used by the encoder chips, for example M3E. from 
MOSDESIGN SEMICONDUCTOR,  allows 
for trinary codes, ie '0','1' and 'X' (OPEN/FLOATING).
However, it seems that only '0' and 'X' is currently used in the 
NEXA/PROOVE remotes. 
The high level in the ASCII-graphs below denotes the transmission 
of the 433 MHz carrier. The low level means no carrier. 

<PRE>
'0' bit:
 ____              ____
|    |            |    |   
|    |            |    |
|    |____________|    |____________

|----|------------|----|------------|
   T       3T        T       3T

'1' bit:
 ____________      ____________
|            |    |            |   
|            |    |            |
|            |____|            |____

|------------|----|------------|----|
      3T        T       3T        T

'X' (OPEN) bit:
 ____              ____________
|    |            |            |   
|    |            |            |
|    |____________|            |____

|----|------------|------------|----|
   T       3T            3T       T

'STOP/SYNC' bit (Note! Longer than the data bit):
 ____             
|    |    
|    |            
|    |__________________________...____

|----|--------------------------...----|
   T                32T
        
If the time T is 350us, one data bit time is 8 T; 2.8ms.
</PRE>

Packet format
-------------
Each packet is made up of 12 trinary bits followed by a stop/sync bit.
Packets are sent n*4 times or more.

If we call the 12 data bits b0..b11 where b0 is sent first, they will have the 
following meaning:

b0..b3 (4 bits) - House (address)<br>
0000 - A<br>
X000 - B<br>
0X00 - C<br>
XX00 - D<br>
00X0 - E<br>
X0X0 - F<br>
0XX0 - G<br>
XXX0 - H<br>
000X - I<br>
X00X - J<br>
0X0X - K<br>
XX0X - L<br>
00XX - M<br>
X0XX - N<br>
0XXX - O<br>
XXXX - P<br>


b4..b7 - Unit<br>
0000 - 1<br>
X000 - 2<br>
0X00 - 3<br>
XX00 - 4<br>
00X0 - 5<br>
X0X0 - 6<br>
0XX0 - 7<br>
XXX0 - 8<br>
000X - 9<br>
X00X - 10<br>
0X0X - 11<br>
XX0X - 12<br>
00XX - 13<br>
X0XX - 14<br>
0XXX - 15<br>
XXXX - 16<br>


b8..b10 - Unknown<br>
0XX<br>

b11 - Activation<br>
0 - OFF<br>
X - ON<br>


Note! This work is partially inspired by the previous work 
done by Per Mellander and vfr (Håkan Nilsson).


Revision History
----------------
2006-10-05   Tord Andersson   Created<br>
2006-10-13   Tord Andersson   Added chip manufacturer (MOSDESIGN)<br>
2010-02-20   Tord Andersson   Removed dead link to Mellander's project<br>
2010-02-22   lgrfbs           Add PRE kommand to fomat the text for wiki see "Diskussion" for link about wiki formating tips. <br>
2010-02-22   Tord Andersson   Additional formatting.<br>
2010-02-23   Tord Andersson   Added reference to vfr (Håkan Nilsson).<br>