Binary transfers
In binary transfer, code conversion is not carried out. Data is treated as a simple byte sequence and transferred.
The size of the send data and receive data becomes the same.
In Type MF-IBMi hosts, when the Receive file is a fixed-length record format file, after HULFT writes data up to the end of a record, HULFT writes subsequent data from the top of the next record.
When the host on the receiving side is a Type MF-IBMi host and the transfer file is a fixed-length record format file, if the sending data size is not an integer multiple of the record length of the Receive file, HULFT sets NULL characters for the remaining part of the Receive file.

For HULFT for Mainframe, the following types of transfer are available:
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Sending with RDW
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Receiving with RDW
For details on Sending with RDW and Receiving with RDW, refer to the following.
HULFT10 for zOS Administration Manual :