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Te c hn i cal Re fe re nce 020-102396-02 FHD492-XV and FHD552-XV Serial Commands...
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The warranty does not apply to any product where the serial number has been removed or obliterated. The warranty also does not apply to any product sold by a reseller to an end user outside of the country where the reseller is located unless (i) Christie has an office in the country where the end user is located or (ii) the required international warranty fee has been paid.
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• Checksum algorithm: The EXCLUSIVE-OR (XOR) of all bytes in the message from the Header byte to the last Data byte. The Checksum itself is not included in this calculation. Christie recommends using a checksum calculator to perform this calculation.