AS-i Output
(Original Document)
About us
Outputs
The 140 EIA 921 supports a maximum of 31 slaves with 4 outputs each. The 124 outputs are mapped into 8 words.
Words 1 ... 8 AS-i Bus Outputs
Words 1 ... 8 contain the state of the AS-i output. Bits D3 ... D0 are the output data bits of each slave.
Distribution
Most significant byte
Least significant byte
Word bits
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Slave output
D3
D2
D1
D0
D3
D2
D1
D0
D3
D2
D1
D0
D3
D2
D1
D0
Word 1
Slave 3
Slave 2
Slave 1
Not Used
Word 2
Slave 7
Slave 6
Slave 5
Slave 4
Word 3
Slave 11
Slave 10
Slave 9
Slave 8
Word 4
Slave 15
Slave 14
Slave 13
Slave 12
Word 5
Slave 19
Slave 18
Slave 17
Slave 16
Word 6
Slave 23
Slave 22
Slave 21
Slave 19
Word 7
Slave 27
Slave 26
Slave 25
Slave 24
Word 8
Slave 31
Slave 30
Slave 29
Slave 28
Word 9 Control Word
Word 9 contains control information.
Words
Most significant byte
Least significant byte
Word 13
-
-
-
-
-
-
-
-
-
-
-
-
D3
D2
D1
D0
D0 - not used
D1 - Set off-line mode
1 = Set AS-i bus to off-line mode: stops communications on AS-i bus
(all inputs and outputs are set to 0)
0 = Set AS-i bus to on-line mode
D2 - Set Data Exchange active
1 = Exchange data on AS-i bus
0 = Stop exchanging data on AS-i bus
(all inputs and outputs retain their actual state)
D3 - Operating mode
1 = Configuration mode
0 = Protected mode
Bits (4 ... 15) - not used