Structure Of The Transfer Protocol - Siemens SIRIUS M200D Manual

Industrial controls load feeders and motor starters
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Appendix
A.1 Acyclic data transfer via CTT2
The M200D AS-i Standard supports the following data sets:
Write
Read
The extended process image with the addressed AS-i slave is not transferred while string
transfers to the AS-i are taking place.
Depending on the type of protocol, the process of transferring a data set to a slave may take
up to 5 s.
A.1.1

Structure of the transfer protocol

CTT2 commands and feedback (request/response)
The M200D Standard supports the following commands and feedback for transferring data
sets:
Code
144
18
dec
82
dec
146
19
dec
83
dec
147
This CTT2 data structure is defined in the AS-i specification V3.0 and is, therefore, the same
for all AS-i masters. The various manufacturers of AS-i masters use different mechanisms
for transferring this CTT2 data to the master, however (command interface or comparable
methods). Please refer to the user documentation for the AS-i master for detailed information
on this.
Therefore, it is up to the user to combine the master-dependent component of the protocol
and the non-master-dependent CTT2 data in order to obtain a transfer protocol that is
complete.
160
Device parameter
Command data set
Device diagnostics
Measured values
Statistical data
Device parameters
Meaning according to AS-i spec.
V3.0
(90
)
Read response not ok
dec
H
(12
)
Read request
H
(52
)
Read response ok
H
(92
)
Read response not ok
dec
H
(13
)
Write request
H
(53
)
Write response ok
H
(93
)
Write response not ok
dec
H
DS 203
DS 93
DS 200
DS 201
DS 202
DS 203
Followed by
Standard error code
Index, length
Data
Standard error code, data set error code
Index, length, data
Standard error code, data set error code
M200D AS-Interface Standard
Manual, 08/2014, A5E02548958A/RS-AA/004
28 bytes
10 bytes
9 bytes
7 bytes
21 bytes
28 bytes

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