transfer file Windows <-> mainframe without any conversion

It sounds like it's known that some bytes in datasets/files are changed as you ftp them between Windows and the mainframe. Everyone must know it, so that why I can't find any information on it? Is there any way around that, using ftp or otherwise?

I have a dataset on the mainframe with some alphanumeric characters but also some 2-byte packed integers. If the low (second) byte in that integer is something small like 0x1F, then when ASCII FTP'd to Windows, the 0x1F remains. But a larger number like 0x62 ends up on Windows as 0xDF.

Even ftp'ing as binary mainframe to Windows and back again ends up with changes.

Actually what I have is an application on Windows that needs to produce these files that when transferred to the mainframe, will look correct. So if I need to be clever and write a wrong value such that when ftp'd, some bytes get changed to the correct value, that would be OK.

 

 

 

 

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