G4ZLP's new interface is a microcontroller unit that uses a completely
unique command set. It is not compatible with MMTTY, MMVARI, 2tone,
WriteLog's "Software Generated FSK" or "Hardware Generated FSK", and
does not emulate a conventional UART.

In short, the only software that works to generate FSK (the interface
will not decode RTTY) with the new G4ZLP interface is DM780 and G4ZLP's
own demo program.

If you want FSK with most other software, pick up a USB to serial
adapter and use the AA5AU driver circuits:
http://www.aa5au.com/rttyinterface.html
The same resistor/transistor level converters are shown in the MMTTY
documentation, Writelog documentation, N1MM Logger documentation,
DXLab Suite documentation as well as documentation for several other
logging packages. Total cost will be less than 10% of the price of
the G4ZLP unit.

73,

... Joe, W4TV