Pepperl+Fuchs VBG-EN-K20-D - Rd_74_75_Param

AS-Interface
Command Interface
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group · Tel.: Germany (6 21) 7 76-0 · USA (3 30) 4 25 35 55 · Singapore 7 79 90 91 · Internet http://www.pepperl-fuchs.com
Issue date - 24.4.2007
64
8.3.2.3 RD_74_75_PARAM
Description:
• with this function the parameter string of a slave according to profile S-7.4 is be-
ing read
or
• the slave response according to profile S-7.5 is being read.
If it is about a slave according to profile 7.5, so have the data in the response buffer
the following meaning:
FFh 00h: Transfer is still active
FFh xxh: Transfer finished with error
The first byte in the buffer notequal FFH: slave response. The response is in the
same form registered in the buffer and transmitted over AS-i.
Since the string can be longer than the command interface, it is written into the
buffer. The content of the buffer can read in parts from index i.
The first byte of the buffer is the length of the read string.
If i ≡ 0, the string is being read from the slave, otherwise the function responses
out of the memory; the data can be read consistently.
Request
byte
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
15B
16
2T – circuit
3 slave address
4i
Response
byte
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
15B
16
2T result
3 buffer byte i
……
n+2 buffer byte i+n-1