Changes

====Sync Wordand Header====0xAA     0xAA     0xAA     0xAA     0xA0     0x05     0xFF----The sync word that the Landis+Gyr smart meters send is shown below, this can be used in GNU Radio or other tools to receive only packets transmitted by the meters. Note that at the start of the header we begin using start and stop bits. These must be stripped off the the data during processing.{| class="wikitable"10101010 10101010 10101010 10101010 10100000 00000101 11111111  |+Sync and Header! colspan="6" |Sync Word (no start/stop bits)! colspan="3" |Header|-!0xAA!0xAA!0xAAPDU align syncword: 0xAAAAAAAAAAA005FF but I use one less !0xAA at the start !0xAA.AA.AA.AA.A0.05.FF!0xA!0x00!0xFF!0x2A0xAA     0xAA     0xAA     0xAA     0xAA     0xA        0x00         0xFF     |     0x2A-|10101010|10101010 |10101010 |10101010 |10101010 10101010 1010   0 |1010|0 '''00000000 ''' 1 |0 '''11111111 ''' 1 | 0 '''00101010 1       Sync Word (no start/stop bits)''' 1|}====Start Using GNU Radio it was found that shortening the Sync requirements a bit and Stop Bits===incorporating part of the header leads to the cleanest data for further downstream processing. The modified sync shown in 8 bit chunks is shown below.{| class="wikitable"|+Sync Word used with GNURadio!0xAA!0xAA!0xAA!0xAA!0xA0!0x05!0xFF|-|10101010|10101010|10101010|10101010|10100000|00000101|11111111====Header====|}The final byte of the sync (0x2A) along with it's start and stop bits are discarded as part of the processing.----<br />

|Packet #1

<code>4) Unknown Identifier #1 = 0x21</code>

<code>7) Unknown Identifier #2 = 0xE288</code>

<code>8) Unknown Identifier #3 = 0x0100</code>

<code>9) Unknown Data #1 = 0x273205</code>

<code>10) Unknown Data #2 = 0x00781930</code>