CHECKSUM for NULL START CODE?

[sblair]

There are no plans to modify the Null Start code packets. This was proposed many years ago and never really got any traction. There's a couple reasons for this, everything on the link would have to support it to be useful. If a fixture implements it but the controller doesn't, then the fixture would never see "valid" data because there is no checksum.

With the high refresh rate and redundancy of data with DMX512 any corrupted packets are quickly flushed through. If we were going to design DMX512 from scratch today, yes it would most likely be included...but the huge install base doesn't really lend itself to modifying functions of the NSC packet.

If you are having problems with data getting corrupted with NSC packets, then it is likely you have a bigger problem (ie. bad cable) that will be trashing the SIP and RDM packets as well.