IDENT-I • IVI-KHA6-4HRX, IVI-KHD2-4HRX
Operating control interface units using the 3964R protocol
Subject to reasonable modifications due to technical advances.
Copyright Fuchs, Printed in Germany
Fuchs Group • Tel.: Germany (06 21) 7 76-0 • USA (330) 4 25 35 55 • Singapore 7 79 90 91 • Internet http://www.pepperl-fuchs.com
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8.2.4
Read commands
Bild 8.14:
Read commands
Read commands
for data carriers
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
Bild 8.16:
Structure of the response message after the data has been read
Example:
Response to the above read command: 77 04 03 11 22 33 44 55
Structure of the response message in the event of an error
Bild 8.17:
Structure of the response message in the event of an error
Example:
Response to the above read command if no code was read: 77 80 07
Command
Hex identifier
Auto Read Bytes
57h
Single Read Bytes
77h
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Command
Head-no.
Data start 1
Data start 2
Quantity
Byte 1
High
Byte 2
Low
Byte 2
Byte 3
Byte 4 ...
Byte n
Command
0
Status/Head
Head-no.
Data
Byte 1
High
Byte 2
Low
Byte 2
Byte 3
Command
8
Status/Head
Status/Error
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}
}
}
}
