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Old May 13th, 2009   #3
Task Group Member
Join Date: Aug 2008
Posts: 369

If you need a checksum for Null Start Code (NSC) packets, SIPs are the proper way to do it.

Yes, the checksum *could* be added to the NSC data itself, but either solution will require a firmware update for both the sender and the receiver. Since you have to modify the firmware anyway, doing it with SIPs allows you to have the checksum functionality without breaking the conventions that determine how NSC data is used.

I think SIPs are one of the best features added in the E1.11 revision of DMX. I wish they were more widely used. Sadly, I'm only aware of 3 devices that support SIPs.
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