Modification: Acknowledgment DGN

Martin Perlot submits the following proposal:

In the Acknowledgment DGN (Section,

Byte 4: Address Acknowledged. uint8 Source Address being acknowledged.
Byte 2, Bits 4-7, Reserved for Compatibility with SAE J1939
Byte 3, Reserved for Compatibility with SAE J1939

SAE has recently modified their version of the same packet. They added the Address Acknowledge byte in the position indicated, and added a three-byte field using bytes 1-3 called "Extended Identifier". The latter is not relevant to RV-C and should not interfere with the RV-C use of these bytes for instance and bank. Implementing these changes shall make it easier for designers to make products compatible with both networks.