Reading Ctt2 Data Sets - Siemens SIRIUS M200D Manual

②
The CTT2 data set begins with the CTT2 command code (13
set length, followed by the data set bytes DS byte 0 to DS byte 27.
The DP command interface for the AS-i master (DP/AS-i Link Advanced) accepts the data set bytes and forwards
them to the addressed slave.
③
The slave processes the command and sends the response to the AS-i master.
④
The AS-i master accepts the response and forwards it to the receive buffer of the CPU via the DP command
interface.
⑤
The response is decoded in the receive buffer of the CPU and the program is executed accordingly. The following
responses are possible:
53 : Error-free transfer
a H
93 : Transfer with error (CTT2 error)
b H
90 : Transfer with error (CTT2_command not supported)
c H
93 : Transfer with error (data set error; see M200D data set error code (Page 166))
d H
A.1.3

Reading CTT2 data sets

Job data in the send buffer
Byte Master-
dependent
content
p+0 Command
number:
p+1 Slave address
p+2 Number of
string bytes
p+3 String byte 1 =
p+4 String byte 2 =
p+5 String byte 3 =
M200D AS-Interface Standard
Manual, 08/2014, A5E02548958A/RS-AA/004
Meaning according to Value for
AS-i spec. V3.0 DS 200
(non-master- "Diagnostics"
dependent)
— 68
— xx
— 3
dec
CTT2: Code 18
CTT2: Index 200
CTT2: Length 9
dec
), the data set number (CB
H
Value for
DS 201
"Measured
values"
(44 ) 68 (44H)
dec H dec
xx
(03 ) 3 (03 )
H dec H
(12 ) 18 (12 )
dec H dec H
(C8 ) 201 (C9 ) 202
dec H dec H
(09 ) 7 (07 )
H dec H
A.1 Acyclic data transfer via CTT2
= 203
H
Value for Value for
DS 202 DS 203
"Statistical "Parameters"
data"
68 (44 ) 68 (44 )
dec H dec H
xx xx
3 (03 ) 3 (03 )
dec H dec H
18 (12 ) 18 (12 )
dec H dec H
203 (CB
dec dec H
(CA )
H
21 (15 ) 28 (1C )
dec H dec H
Appendix
), and the data
dec
Meaning
CTT2
request_write
Bits 0 to 4:
Slave address
Bit 5:
0 → A addr.
1 → B addr.
Number of
subsequent
bytes
= CTT2
command
) = DS number
= DS length
163