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