All that you would normally do is wire the array into a for loop and then to a VISA Write.
As I said, I don't know how this will work for the prologix since it will only show as a serial port resource. None of the connected instruments will appear.
You do not need to concantanate strings. You can configure a single termination character with a property node (see Advanced Serial Write and Read) or simply set your string control/constant for '\' Codes Display. This is a right click option.

edit-forgot to add the string returned by the read.