Multibyte character set (MBCS) support

Data conversion occurs for multibyte data on the data connection when ENCODING=MBCS is in effect and the data type is ASCII. For more information, see the FTP.DATA statement ENCODING in z/OS Communications Server: IP Configuration Reference and the SITE ENCODING command in z/OS Communications Server: IP User's Guide and Commands.

If you choose ENCODING=MBCS, you must specify MBDATACONN with a statement in the FTP.DATA file or with the SITE MBDATACONN command to name the code pages for the multibyte data transfer. If you attempt an ASCII data transfer with ENCODING=MBCS and no MBDATACONN specified, the client receives the following reply:
504
Multibyte encoding set but code pages are not defined.
If the multibyte data that you transfer has codepoints that cannot be translated, the transfer fails and the client receives the following reply:
557
Data contains codepoints that cannot be translated.
You can determine which bytes of the data cannot be translated by repeating the transfer with the DUMP 42 extended trace option active at the server.