Pepperl+Fuchs IVI-KHA6-4HRX - Read Commands

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 Pepperl+Fuchs, Printed in Germany
P
epperl+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
Date of issue 27.08.2001
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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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