Security Command R500 Specifications Page 98

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1070 072 131-102 (96.08) GB
BUEP64 Protocol 9-5
NAK = Negative Acknowledge, control character, negative response, e.g. if a
transfer fault occurs.
BWT = Block Wait Time, max. 4 seconds, max. time until a defective block is
repeated.
High / Low priority = Specifies which device has priority control when an access procedure is
occurring.
Checksum = Secures the data and is transmitted at the end of each block. The block
check character BCC is generated from the parity (*) of the information
bits of all data bytes (incl. DLE doubling) in a transmitted or received
block. The generation begins with the first user data byte and ends after
the DLE ETX character. No restrictions have been specified for the in-
formation characters (code-transparent).
* Parity: XO (Exclusive OR) of all data bytes.
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