BECKHOFF KL6001 - Manual (Page 15)

Data transfer, function
KL6001 15
Example
Output
Control byte
Input
status byte Comment
00000000 0XXXX0X0 Start of data transfer
00100001
Data bytes: in D0 and D1
0XXXX0X0
Controller requests sending of
2-data from the terminal
.... ....
00100001
Data bytes: in D0 and D1
0XXXX0X1
Terminal has loaded 2-data
into the send FIFO and the-
command has been executed.
01010000
Data bytes in D0 to D4
0XXXX0X1
Data bytes:DC Controller requests sending of
5-data (D0-D4) from the termi-
nal
.... ....
01010000
Data bytes: in D0 und D1
0XXXX0X0
Terminal has loaded 5-data
into the send FIFO and the
command has been executed
RA/RR:REICEIVE-
ACCEPTED/RECEIVE-
REQUEST
By way of a status change of RR, the terminal informs the controller that
the number of data items indicated in IL0-IL1 is located in D0-D4. Transfer
of the data is acknowledged in the control byte with RA, and only then is
new data transferred from the terminal to the controller.
Example
Output
control byte
Input
status byte Comment
00000000 0XXXX00X Start of data transfer
0XXX000X 0011X01X
Terminal requests acceptance of 3-
data from D0-D2 by the controller.
.... ....
0XXX001X 0011X01X
Controller has accepted data
0XXX001X 0101X00X
Terminal requests acceptance of
5-data from D0-D4 by the controller
.... ....
0XXX000X 0101X00X
Controller has accepted data
IR/IA:
INIT-REQUEST/INIT-
ACCEPTED
The terminal performs initialization if IR is high. The send and receive func-
tions are disabled, the FIFO flags are reset and the interface is initialized
with the values of the responsible registers (R32-R35,R18). The terminal
acknowledges execution of initialization with IA.
Example
Output
control byte
Input
status byte Comment
0XXXXXXX 0XXXXXXX Start of data transfer
00000100 0XXXXXXX Initialization is requested by the con-
troller.
.... ....
00000100 00000100
Terminal has completed initialization
00000000 00000100
Controller requests data exchange
.... ....
00000000 00000000
Terminal is ready