AS-Interface Version 2.1 Introduction
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AS-Interface Version 2.1 Introduction
The functionality of AS-Interface has been expanded to support the operation of up to 62 AS-
Interface slaves on one branch. Moreover, the transmission of analogue values with AS-Inter-
face Version 2.1 and higher is as simple as transmitting binary values.
For the AS-Interface-Handheld APG-02 described in this manual, only the extension to 62 sub-
scribers described below is relevant.
In order for the extension to be used, it is important that both the slaves as well as the master
support AS-Interface Version 2.1.
AS-Interface makes available 5 bits for the address in the master request telegram. This is suf-
ficient to address 32 subscribers. In normal operation, address 0 is not permitted, thus allowing
31 AS-Interface slaves to be operated. The address space will be doubled using data bit D3
as sixth bit for addressing. So 62 slaves will be addressed.
For reasons of compatibility, the telegram frame cannot be changed.
Using the identification code, the master detects whether or not Version 2.1 is supported (ID
code = 0A
hex
). If it is a Version 2.1 AS-Interface slave, this slave receives two additional iden-
tification codes (ID1 and ID2) which describe the functionality of the slave. A special feature of
these additional ID codes is that the ID1 code can be written by the user.
The automatic change of addressing a slave with address 0 by a master will only be executed
when all ID codes of the new slave match those of the old slave.
AS-Interface slaves which do
not
support Version 2.1 can be operated
in mixed operation with AS-Interface slaves which do support
Version 2.1.
The AS-Interface-Handheld APG-02 permits the writing of identification
code ID1.
If the ID-code ID1 is changed with an AS-Interface-Handheld by the
user and automatic address programming is used, make certain that
the correct ID-code 1 was stored in the slave
before
installing the new
slave.
