Instrument Interface, readUntil() only single Char delimiters?

So I have installed the Instrument Interface and the Serial Modules. I watched all the SepaSoft videos and browsed through a good number of posts. What I am looking for is a confirmation that the readUntil() of the Serial Controller only takes single Char. Like I can’t use ‘/r/n’ as my delimiter?
My work around is to just use ‘/r’ as my delimiter and then clear the buffer to kick out the /n cause if I don’t I get the /n on the next read.

Also I have attached my sample project for any other new people getting into the Instrument Interface. SerialTest (2018-02-09).proj (27.7 KB)