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All USB command follow the same format: | All USB command follow the same format: | ||
<pre> | <pre> | ||
host 01 05 | host 01 05 sending 1 byte: are you there? | ||
laser 04 | laser 04 yes I am here | ||
host 05 01 01 10 06 e8 | host 05 01 01 10 06 e8 sending 5 bytes, 1 byte payload, always 1, 10 is the command, 06 is the payload, e8 is the checksum | ||
laser 06 | laser 06 OK, I received and understood (ACK) | ||
laser 05 | laser 05 host, are you there? | ||
host 01 04 | host 01 04 sending 1 byte, yes i am here | ||
laser 00 01 10 00 ef | laser 00 01 10 00 ef 0 bytes payload, always 1, repeating the command sent, payload would be here, 00 is OK (81 is checksum error), checksum | ||
host 01 06 | host 01 06 sending 1 byte, OK (ACK) | ||
</pre> | </pre> | ||
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