Pepperl+Fuchs VBG-PB-K25 - Wr_74_75_Param; Rd_74_75_Param

AS-Interface
Command Interface
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
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Issue date - 21.12.2005
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8.2.1.10 WR_74_75_PARAM
Description:
• with this function the parameter string of a slave according to profile S-7.4 is be-
ing written
or
• the data tranfer with a slave according to profile S-7.5 is started.
If it is about a slave according to profile 7.5, data have to be registered into the buff-
er in the same form, as they have to be sent by AS-i.
Since the string can be longer than the command interface, it will partly be written
into the buffer and then be transferred to the slave.
n is the length of the part of the string which should be written into the buffer from
index i on.
If i ≡ 0, then the string is being transferred to the slave.
8.2.1.11 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.
Request
byte
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1 5A
16
2 T – circuit
3 slave address
4 i
5 n
6 buffer btye i
… …
n+5 buffer byte i+n-1
Response
byte
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1 5A
16
2 T results