Command Flags Response; Bcc; Example Request Packet - Kodak DryView 8150 Safety Manual

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September 2002

3.1.4 Command Flags Response

The command flags in the response packet report the actions of the reader. The meanings of

the bits are defined below.

Bits 0-3

Bit 4

Bits 5-7

A Block Check Character (BCC) is used for error detection and is attached to the end of the

packet. The 16 bit BCC is calculated on all the bytes of the packet including the SOF. The BCC

consists of two parts: the LSbyte is a Longitudinal Redundancy Check (LRC) and the MSbyte is

the ones compliment of the LRC. The LRC is calculated by performing a cumulative Exclusive-

OR operation on all the bytes of the packet.

hex

Reserved for future use.

Error flag. If this flag is set the command was unsuccessful and the

data section of the response packet contains the error code. (See

section Appendix B for a list of error codes.)

Reserved for future use.

SOF

LSbyte of length

MSbyte of length

LSbyte of node address

MSbyte of node address

Command flags (Not addressed)

Command (Tag-it

Read block)

Data (Block number 1)

LSbyte of Checksum

MSbyte of Checksum

S6350 Midrange Reader Module - Reference Guide

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