This means Mango got a response but the function code in the response is not valid. This can happen if your RS-485 wiring is not good and there is noise on the line so some of the messages get corrupted. Playing around with the settings Phillip suggest is also a good idea. It's generally expected that you will occasionally get corrupted messages over RS-485 so if this happens ever once and awhile I wouldn't worry about it as long as you are still getting data reliably.
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