GE RSTi-EP - Page 221

Chapter 5 Detailed Descriptions of I/O Modules
GFK-2958E RSTi-EP User Manual 217
The status and control word values during various states of communication are provided in the
following table.
Action
Input Byte 0 (Status) of Module
Input
Byte 1
(length
of RX
byte
seg.)
Output byte 0 (control) off the module
Output
byte 1
(length
of TX
byte
seg.)
Notes
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Stat
TX_CNT_ACK
RX_CNT
STATRES
RX_CNT_ACK
TX_CNT
Init/
Startup
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
After
powerup,
module is
ready for
communi-
cation
Activate
communi-
cation
1
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
PLC is
ready for
communi-
cation
(response)
Receive
data
1
0
0
0
1
0
0
0
N
(1 ..14)
1
0
0
0
0
0
0
0
0
Module
has
received
bytes
1
0
0
0
1
0
0
0
N
1
0
1
0
0
0
0
0
0
RX
acknow-
ledge after
data taken
over
Send
data
1
0
0
0
1
0
0
0
X
1
0
1
0
1
0
0
0
N
(1..14)
Before
changing
TX-CNT, set
TX bytes
1
0
1
0
1
0
0
0
X
1
0
1
0
1
0
0
0
N
TX
acknow-
ledge after
module
sent data