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RSTi-EP Slice I/O Serial Communication Module
The status and control word values during various states of communication are provided in the following table.
Input Byte 0 (Status) of Module
Action
7
6
Stat
TX_CNT_ACK
Init/
1
0
Startup
Activate
communi-
1
0
cation
1
0
Receive
data
1
0
1
0
Send
data
1
0
5
4
3
2
1
0
RX_CNT
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
1
0
1
0
0
0
Input
Output byte 0 (control) off the module
Byte 1
7
6
(length
of RX
byte
STATRES
RX_CNT_ACK
seg.)
0
0
0
0
1
0
N
1
0
(1 ..14)
N
1
0
X
1
0
X
1
0
For public disclosure
5
4
3
2
1
0
TX_CNT
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
1
0
1
0
0
0
1
0
1
0
0
0
9
GFK-2992B
Output
Notes
byte 1
(length
of TX
byte
seg.)
After
powerup,
module is
0
ready for
communi-
cation
PLC is
ready for
0
communi-
cation
(response)
Module
has
0
received
bytes
RX
acknow-
0
ledge after
data taken
over
Before
N
changing
(1..14)
TX-CNT, set
TX bytes
TX
acknow-
N
ledge after
module
sent data
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