The automation module only recognizes uppercase in the hex encoding #4
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Page 5 of the Protocol document:
"Data
An 8-bit binary value is sent as two upper-case ASCII digits (‘0’...’9’, ‘A’...’F’)."
This is a suprisingly latent bug, since the most commonly used data sent to the module happens to use numbers and not hex letters. But even then it can affect checksums sporadically.