Close SubVI Front Panel

[SparkyOne]

Ok, here is my functional version, without any changes.   I don't think you're going to be able to even run the VI without my hardware?   You may be able to trick it by using another com port....but the data stream will be missing, and the SubVI's may not display.

The "RS422" is the main, and the other two are subs.

[Gregory]

The data does not go in the top input of the enqueue element function.

You need to first use "Obtain Queue" to get a queue reference, which goes through the top inputs of the queue functions. Your data will go in the first from the top. When you are done with the queue, you will use "Release Queue" to free it up.