SG Security Communications MLR2-E Manual do Utilizador Página 5

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Form Number.: 7-3005 File Name: SG Automation Output Revision/Date: 01/May 3, 2005
Department: Engineering
Division: Embedded Software Form Template Owner: Jeff Cougler
5
1.4 B32 Headers
The MLR2000 and System III receivers contain an option to add 4 additional bytes to all packets. The default for this option is
disabled.
1. B32 Headers apply only to TCP/IP automation messages, not serial messages or printer messages.
2. When enabled ALL outgoing and incoming automation messages will contain 4 extra bytes at the start of each packet.
These four bytes are:00 00 LL LL
where LL LL = is the BCD value of the size of the entire packet..
ie.. if the original length was 1B HEX bytes to be sent, the packet would be:
00 00 00 31 <original packet>
and the ACK back to the receiver will be:
00 00 00 05 06
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