WiModem232 works great until file transfer

[admin]

XON/XOFF is not supported.  You should only need flow control at 9600 baud and higher.  Zmodem protocol requires extremely laxed timing due to the Internet latency.  Xmodem, Xmodem CRC, and Xmodem 1K all work fine.  What protocol are you trying to use?  Have you verified that your terminal software and PC work with file transfers for a real modem?

If you are calling a BBS that uses telnet escaping are you enabling telnet mode using AT*T1?