Not sur filling an array will be better than Hserout, it still take some time to fill it. What I would do is to use a variant of Darrel's embedded string in your codespace for the known data, then maybe you could have an array to store your unknown data into a run time.

Depending how you format your thing, it may also take some time to process it. Usually we use a NULL character to specify a string/set of data end. This assume you need to check each character, test it and then send it... duh.

BUT you may have a String/Data start AND end address and loop from the start to the end.. still it always test if you're at the end address.

Not sure of your requirement, but sure enough, I don't see many advantage over a simple HSEROUT line, code size appart.

Circular buffer...mmm.....

Explain your exact requirement, post your code here, we will have a look at that.