CONTROL124 Datasheet, PDF (5/7 Pages) Radiometrix Ltd – 4 bit Address - 12 bit Data encoder/decoder

Differential Manchester encoding coverts the 0000 into 11001100 which is the bit pattern equivalent to preamble
required to settle adaptive data slicer in the RF receiver module.
Preamble =
Sync1 =
Sync2 =
DataA =
DataB =
Address =
Checksum =
11001100
this byte is not decoded.
10111111
111100(A7)(B7)
0(DA6-DA0)
0(DB6-DB0)
0(A5-A0)0
sum of (DA7-DA0) + (DB7-DB0) + Adr(whole byte) truncated to 8 bits
This allows 6 bits of address and 2 data bytes per 60ms burst when 3.58MHz resonator is used.
Preamble Sync1
Sync2
Data A
Data B
Address
Check Sum
Postamble
00000000000000
11001100
10111111 111100(DA7)(DB7)
0(DA6:DA0) 0(DB6:DB0)
0(A5:A0)0
DA7:DA0+DB7:DB0
+A7:A0
0000
Figure 6: Control124 data packet
In the following example, Control124 in Encoder mode is set with the following.
DA7 DA6 DA5 DA4 DA3 DA2 DA1 DA0 DB3 DB2 DB1 DB0 A3 A2 A1 A0
0
1
1
0
1
0
0
1
1
0
1
0
1
0
0
1
The Control124 will packetise the address and data into the following format.
Preamble Sync1
Sync2
Data A Data B Address Checksum Postamble
11001100 10111111 11110010 01101001 00001010 00010010 10000101 0000
Figure 7: Synchronisation codes, DataA, DataB, Address, Checksum and Postamble
Radiometrix Ltd
Control124
page 5