What situations can file transfer not be performed?
There aren’t any. If you’re using a Unix host system via a serial or modem connection, use ZMODEM on the host and change the serial transfer mode in the Serial Transfer tab under Configuration to use ZMODEM. If you are using a serial connection to a host and have TCP/IP running on the host, we recommend reconfiguring the serial port to act as a network port by placing it in SLIP or PPP mode. That way, you can use ZTERM’s FTP client which allows wildcarding, better performance and host browsing.