IDENT-I • IVI-KHD2-4HB5, IVI-KHA6-4HB5
Operation with the INTERBUS
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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7.2.2
Communication control interface unit
Þ
INTERBUS master
In the direction control interface unit to INTERBUS master, the words are assigned as
follows:
The status messages indicated by * are not represented in the INTERBUS control in-
terface unit.
Word 2+3: read data
The execution of the command commences as soon as a valid command with toggled
flag "T" has been written in the code. On receipt of the command, this flag is sent back
by the control interface unit as an acknowledgement, and likewise with the remaining
fields of word 0.
The execution counter is reset at the start of the command execution and then incre-
mented when the command has been fully executed, in order to indicate the availabi-
lity of the status message and the read data, if required. In the buffered mode, the
execution counter is incremented on each successful read or write operation.
Word 0:
C Par Toggle flag
Word 1:
Status/execution counter/head number
Bit No.
15
14
13
12
11 10
9
8
7
6
5
4
3
2
1
0
Designation
-
K3
K2 K1 N4 N3 N2 N1
-
-
-
-
S4 S3 S2 S1
K3..1:
Read head number (head 1...4, s.o.)
N4..1:
4 bit execution counter
S4..1:
Status/error message, s.a.
Nr.
S4
S3
S2
S1
Meaning
0
0
0
0
0
Command was executed with no error
1
0
0
0
1
Battery low (only IMC-40), command was not correctly
executed
2
0
0
1
0
* Self test ok, device is ready for operation (only for
switch-on message)
3
0
0
1
1
* Internal error, device is ready for operation again
(Watchdog reset, only for switch-on message)
4
0
1
0
0
Incorrect or incomplete command or parameter not in
valid range or timeout
5
0
1
0
1
Read or write error
6
0
1
1
0
Hardware error ( * µC / * RAM / * ROM / * EEPROM /
Read head)