The XMODEM file transfer protocol requires the communication lines to be transparent to all 8 bit characters, from $00 to $FF.
Set the appropriate parameters in the [Setup] Serial port dialog box. Data must be 8 bit, and Flow control must be hard (CTS/RTS) or none.
If file transfers fail, try connecting to the host with the binary option. To connect with the binary option:
The XMODEM file transfer protocol handles files in blocks of 128 or 1024 bytes, and file lengths cannot be exchanged. The received data length is always a multiple of 128 or 1024 bytes.
Sender puts padding in the last block that is longer than the length of the transmitted file. The padding is $1A according to the XMODEM specification. But it may be some other value depending on the XMODEM sending program.