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Checksum curiosa

RDM General Implementation Discussion General Discussion and questions relating to implementing RDM in a product.

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September 19th, 2006

sjackman

Task Group Member

Join Date: Sep 2006

Posts: 26

Checksum curiosa

The spec states that...

Quote:

The Checksum field is the unsigned, modulo 0x10000, 16-bit additive checksum of the entire packet’s slot data, including START Code.

However, the checksum covers a maximum of 255 bytes, each with a maximum value of 255, so the maximum possible checksum is 65025, or 0xfe01. So the checksum is in fact not modulo at all.

Cheers,
Shaun

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