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IDENT-I • IVI-KHA6-4HRX, IVI-KHD2-4HRX
Operating control interface units using the 3964R protocol
8.2.3 Fixed code read commands
Command
Read Fixed code
Buffered Read Fixed code
Bild 8.11:
Fixed code read commands
Read commands for the basic fixed code operating mode
with read head number
When a read head is specified in a command, it is interrogated once only. The result
(code or error message) will then be transmitted in a SEND message. After successful
transmission, the control interface unit waits for another command.
Byte 1
20h
Bild 8.12:
Structure of response message after a code has been read
Example:
Read-command without read head number
All connected heads are interrogated once. The codes which are read are transmitted
in packed form in a message. The data structure is as for commands R1 ... R4.
Example:
Subject to reasonable modifications due to technical advances.
42
Pepperl+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
High
Low
Byte 2
Byte 2
0
Head
Status
A code was read at read head 4
A code was read at read head 2 and 4.
Response: 20 0A 1A 66 0C 8F 4A 65 11 78
Hex identifier
20h
21h
High
Low
Byte 3
Byte 3
Head-no.
Code
Copyright Pepperl+Fuchs, Printed in Germany
Byte 4 ...
Byte 6
Code
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