256 • I/O modules
RS485C interface 750-653
Modular I/O System
ETHERNET TCP/IP
- As soon as TA = TR, the data has been transferred to the output buffer..
Input
byte0
Status
byte
Input
byte2
Input
byte1
XX
0XXX.XXX1
XX
XX
The data is still being transferred.
XX
0XXX.XXX0
XX
XX
Data transfer completed.
Receiving the character chain "WAGO”
-As soon as RA
≠
RR, the input bytes contain data.
Output byte 0
Control byte
Output byte 2
Output byte 1
XX
0XXX.000X
XX
XX
Input
byte0
Status
byte
Input
byte2
Input
byte1
XX
0XXX.0X0X
XX
XX
No received data available.
‘W’
0011.0X1X
‘G’
‘A’
The information is in the input bytes.
-After the 3 characters have been processed, RA is inverted.
Out-
put
byte 0
Control
byte
Output
byte 2
Output
byte 1
XX
0XXX.001X
XX
XX
Command to read from input buffer
-If RA
≠
RR, the receiving of additional characters will continue.
Input
byte 0
Status
byte
Input
byte 2
Input
byte 1
XX
0XXX.0X1X
XX
XX
No received data available.
‘O’
0001.0X0X
XX
XX
The information is in the input bytes.
-After the characters have been processed, RA is inverted.
Output byte 0
Control byte
Output byte2
Output byte1
XX
0XXX.000X
XX
XX
Attention
0 x 23 is a hexadecimal value
0101.1001 is a binary value
An X indicates that this particular value has no importance.
XX indicates that the whole value has no importance.
Attention
For the process data configuration of these bus modules please refer to chapter
"Process data architecture for MODBUS/TCP" in the process image descripti-
on of the corresponding coupler/controller.