This is from the log after starting the debug.
2019-02-23 10:28:43.911 [DEBUG] [nternal.protocol.StreamAvrConnection] - Command sent to AVR @192.168.2.5:8102: ?V
2019-02-23 10:28:43.914 [DEBUG] [nternal.protocol.StreamAvrConnection] - Command sent to AVR @192.168.2.5:8102: ?M
2019-02-23 10:28:43.917 [DEBUG] [nternal.protocol.StreamAvrConnection] - Command sent to AVR @192.168.2.5:8102: ?F
2019-02-23 10:28:43.923 [DEBUG] [nternal.protocol.StreamAvrConnection] - Data received from AVR @192.168.2.5:8102: R
2019-02-23 10:28:43.926 [DEBUG] [.internal.handler.AbstractAvrHandler] - Unkown response type from AVR @R. Response discarded: org.openhab.binding.pioneeravr.internal.protocol.ip.IpAvrConnection@41d5fe
2019-02-23 10:28:43.928 [DEBUG] [nternal.protocol.StreamAvrConnection] - Data received from AVR @192.168.2.5:8102: VOL083
2019-02-23 10:28:43.939 [DEBUG] [nternal.protocol.StreamAvrConnection] - Data received from AVR @192.168.2.5:8102: MUT1
2019-02-23 10:28:43.949 [DEBUG] [nternal.protocol.StreamAvrConnection] - Data received from AVR @192.168.2.5:8102: FN25
==> /var/log/openhab2/events.log <==
2019-02-23 10:28:43.962 [vent.ItemStateChangedEvent] - PioneerVSX1023k_Zone1_Volume changed from 81 to 44
==> /var/log/openhab2/openhab.log <==
2019-02-23 10:28:53.907 [DEBUG] [.internal.handler.AbstractAvrHandler] - Checking status of AVR @192.168.2.5:8102
2019-02-23 10:28:53.911 [DEBUG] [nternal.protocol.StreamAvrConnection] - Command sent to AVR @192.168.2.5:8102: ?P
2019-02-23 10:28:53.916 [DEBUG] [nternal.protocol.StreamAvrConnection] - Command sent to AVR @192.168.2.5:8102: ?AP
2019-02-23 10:28:53.920 [DEBUG] [nternal.protocol.StreamAvrConnection] - Command sent to AVR @192.168.2.5:8102: ?BP
2019-02-23 10:28:53.924 [DEBUG] [nternal.protocol.StreamAvrConnection] - Data received from AVR @192.168.2.5:8102: R
2019-02-23 10:28:53.930 [DEBUG] [.internal.handler.AbstractAvrHandler] - Unkown response type from AVR @R. Response discarded: org.openhab.binding.pioneeravr.internal.protocol.ip.IpAvrConnection@41d5fe
2019-02-23 10:28:53.934 [DEBUG] [nternal.protocol.StreamAvrConnection] - Data received from AVR @192.168.2.5:8102: PWR0
2019-02-23 10:28:53.937 [DEBUG] [nternal.protocol.StreamAvrConnection] - Command sent to AVR @192.168.2.5:8102: ?V
2019-02-23 10:28:53.940 [DEBUG] [nternal.protocol.StreamAvrConnection] - Command sent to AVR @192.168.2.5:8102: ?M
2019-02-23 10:28:53.943 [DEBUG] [nternal.protocol.StreamAvrConnection] - Command sent to AVR @192.168.2.5:8102: ?F
2019-02-23 10:28:53.949 [DEBUG] [nternal.protocol.StreamAvrConnection] - Data received from AVR @192.168.2.5:8102: R
2019-02-23 10:28:53.960 [DEBUG] [.internal.handler.AbstractAvrHandler] - Unkown response type from AVR @R. Response discarded: org.openhab.binding.pioneeravr.internal.protocol.ip.IpAvrConnection@41d5fe
2019-02-23 10:28:53.965 [DEBUG] [nternal.protocol.StreamAvrConnection] - Data received from AVR @192.168.2.5:8102: VOL083
2019-02-23 10:28:53.973 [DEBUG] [nternal.protocol.StreamAvrConnection] - Data received from AVR @192.168.2.5:8102: MUT1
2019-02-23 10:28:53.978 [DEBUG] [nternal.protocol.StreamAvrConnection] - Data received from AVR @192.168.2.5:8102: FN25
2019-02-23 10:29:03.924 [DEBUG] [.internal.handler.AbstractAvrHandler] - Checking status of AVR @192.168.2.5:8102