Quick-VAN is a file transfer protocol used in a BBS called PC-VAN. Quick-VAN cannot be used with 7-bit lines.
If Data is 7 bit, Quick-VAN cannot be used. Set Data to 8 bitin the [Setup] Serial port. The settings on the modem (host) side should be the same.
When connecting to PC-VAN, be sure to specify the binary option (as of December 1995). To set it binary,
In addition, the following settings may improve the transfer rate.
see Window size of Quick-VAN
If you are unable to transfer the data successfully, please make sure that you have correctly specified the Quick-VAN command on the host side, then capture the log of the Quick-VAN and send it to the author.