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IDENT-I • IVI-KHA6-4HRX, IVI-KHD2-4HRX
Operating control interface units using the 3964R protocol
8.2.4 Read commands
Command
Auto Read Bytes
Single Read Bytes
Bild 8.14:
Read commands
Read commands for data carriers
Byte 1
Command
Bild 8.15:
Structure of a read command
Example: A single read attempt at head-no. 3. Read 5 bytes starting at address 0Ah
(=10) : 77 03 00 0A 05
Structure of the response message after the data has been read
Byte 1
Command
Bild 8.16:
Structure of the response message after the data has been read
Example:
Structure of the response message in the event of an error
Byte 1
Command
Bild 8.17:
Structure of the response message in the event of an error
Example:
Subject to reasonable modifications due to technical advances.
44
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Byte 2
Head-no.
Data start 1
High
Byte 2
0
Status/Head
Response to the above read command: 77 04 03 11 22 33 44 55
High
Byte 2
8
Response to the above read command if no code was read: 77 80 07
Hex identifier
57h
77h
Byte 3
Byte 4
Data start 2
Low
Byte 2
Byte 3
Head-no.
Low
Byte 2
Status/Head
Byte 5
Quantity
Byte 4 ...
Byte n
Data
Byte 3
Status/Error
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