A problem with FrameEventListener

[mastera74]

I understand correctly?
The master writes to the slave, the event.
The master reads from the slave, an event.
Does not work.

FrameEventListener listener = new FrameEventListener() {
@OverRide
public void frameSentEvent(FrameEvent event) {
System.out.println("frame sent " + DataUtils.toAscii(event.getBytes()));
}
@OverRide
public void frameReceivedEvent(FrameEvent event) {
System.out.println("frame recv " + DataUtils.toAscii(event.getBytes()));
}
};
modbusSlave.addListener(listener);