Changes

Landis+Gyr GridStream Protocol (view source)

Revision as of 15:34, 14 January 2023

126 bytes added , 15:34, 14 January 2023

→‎Sync and Header: Added GNURadio v4/v5 sync data

|[11] '''11111111''' 1

|}

----Using GNU Radio it was found that shortening the Sync requirements a bit and 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. These two sync's are both loaded into the '''PDU Align''' block and if either one is matched the full packet is passed downstream.

{| class="wikitable"

|+Sync Word used with GNURadiofor v4

!0xAA

!0x00

!0x5F

!0xF

|-

|10101010

|00000000

|01011111

|1111

|}

{| class="wikitable"

|+Sync Word used with GNURadio for v5

!0xAA

!~~0xA0~~0x00!~~0x05~~0x7F!~~0xFF~~0x1F

|-

|10101010

|~~10101010~~00000000|~~10101010~~01111111|~~10100000|00000101|11111111~~11111

|}

~~The final byte of the sync (0x2A) along with it's start and stop bits are discarded as part of the processing.~~

----<br />

====Type, Length and Sub Type====

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