I am having trouble figuring out the 3 check bytes. I have managed to figure out most of the hex commands except for the "check bytes" by sniffing the serial communications from the Labview driver (which doesn't work for my particular application). I am trying to reverse engineer a two wire RS-485 standard serial bus interface to talk to a Watlow EZ-Zone PM of which I have not been able to find any documentation of the protocol.
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