Hi Mike,
FTP Out atom does not support an attribute for delimiter at the moment (framework version 1.22.5).
Therefore it's not documented, there is no way to set a delimiter using the FTP atom at the moment.
Please use a workaround and generate your file with delimiters using the storefile atom and upload it via a ftp tool.
best regards
Bastian
P.S.: SAP is planning to introduce the attribute for delimiter in FTP out atom in in of the following patches.