Kodak DryView 8150 Safety Manual page 55

September 2002
Response Packet Format for ISO/IEC 15693-3
Similar to the request packet, the response packet consists of the header, packet length, node
address, command flags, reader command (60
some number "m" and the checksum.
The ISO Response Data packet can come in one of two possible generic formats: (a) One for
the ISO Inventory Response, and (b) all other ISO responses. These will be highlighted in the
following sections.
The Error Byte (ISO Response Data Byte 0)
There are three possible reader errors that can be generated in response to an ISO 15693
command. This error code will be returned within the Error Byte (Byte 0) of the ISO
Response Data. The error codes are as follows:
01
02
04
Response Packet Format
Header Packet
Length
'01 ' LSB MSB
hex
1 byte 2 bytes
Response Packet Description
Field Length
Header 1 byte
Packet 2 bytes
Length
Node 2 bytes
Address
Response 1 byte
Flags
Command 1 byte
Data 0-m
bytes
Checksum 2 bytes
Note:
With the exception of the ISO Inventory Response packet, the format
for each standard response packet is the same.
Transponder not found
hex
Command not supported
hex
Invalid flags
hex
Standard reader Response Packet Format (See Section 3.1)
Node Response
Address Flags
LSB MSB Flags
2 bytes 1 byte
Defines the start of the packet (01
Defines the length of the packet, including checksum.
Defines the Node address of the reader.
Defines the response of the reader to the request. Bit 4 defines the
error status; a set value indicates that an error has occurred. (Other
values reserved for future use)
Defines the command that the reader executed (60
commands)
Defines the data returned by the reader in response to a command.
Byte 1 is an XOR checksum of all elements from the header to the
last byte of the data field. Byte 2 is calculated as (FF
S6350 Midrange Reader Module - Reference Guide
), ISO/IEC 15693-3 command/data bytes 0 to
hex
Command ISO Response
Data
Data
bytes
'60 '
hex
0 - 'm'
1 byte 'm' bytes
Description
).
hex
29
Checksum
Byte 1 Byte 2
2 bytes
for ISO 15693-3
hex
) XOR (byte 1)
hex