Programming
Bit
Name
Comment
SW.3
BUF_F (buffer full)
1
bin
The reception FIFO is full.
All further incoming data
will be lost!
SW.2
IA
(InitAccepted bit)
1
bin
Initialization was
completed by the
interface.
0
bin
The interface is ready
again for serial data
exchange.
SW.1
RR
(ReceiveRequest)
toggle
Via a change of state of
this bit the interface
notifies the controller that
the DataIn bytes contain
the number of bytes
indicated via the IL bits.
The controller has to
acknowledge receipt of
the data in the control
word via a change of state
of bit
CW.1
(RA). Only
then new data can be
transferred from the
interface to the controller.
SW.0
TA
(TransmitAccepted)
toggle
The interface
acknowledges receipt of
data by changing the state
of this bit. Only now new
data can be transferred
from the controller to the
interface.
A simple example based on the RS232 interface is used to explain the interface and the principle of
operation. The example sends data via the RS232. The data are received via a bridge (PIN 2 to 3). http://
infosys.beckhoff.com/content/1033/cx8080_hw/Resources/zip/2495112075.zip
CX8080
44
Version: 1.0.0
