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Thank you, phildunlap. I've got exception stack trace like next. com.serotonin.bacnet4j.exception.BACnetTimeoutException: No response from instanceId XXXXX com.serotonin.bacnet4j.util.RemoteDeviceFinder$DeviceFutureImpl.get(RemoteDeviceFinder.java:176) com.serotonin.bacnet4j.LocalDevice$2.get(LocalDevice.java:705) Also I use timeout related code like the following. Transport transport = new DefaultTransport(network); transport.setTimeout(30000); transport.setSegTimeout(30000); RemoteDeviceFuture dd = localDevice.getRemoteDevice(XXXXX); RemoteDevice d = dd.get(90000); I think this is the bacnet device's problem now, but if I've not use the code correctly, I hope to know about it.

Thank you. But the content of the link says it relates java option matter, it seems doubtful a little for me about it. I'll try it anyway.

Thank you for your answering. I realized that instaceId == deviceId ,later. I could do what I want as below. RemoteDeviceFuture dd = localDevice.getRemoteDevice(instaceId ); RemoteDevice d = dd.get(); The bug what I got seems being resolved with getRemoteDevice() of Bacnet4J 4.X. thank you.