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Enabling Modem Emulation Mode
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Modem emulation mode allows binary data to be transmitted over a two (or more) wire interface with full handshaking and modem control signalling, thus allowing PPP connections to be made. Possible applications include mobile phone data cables, and radio links.

Including the following entries in the FTDIPORT.INF file for the VCP driver before installation enables modem emulation mode:


This creates a registry entry under

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\FTDIBUS\{Device VID, PID and serial number}\0000\Device Parameters\EmulationMode  

e see
AN232B-09 Using the Modem Emulation Mode in FTDI's VCP Driver
for additional inform
ation on modem emulation mode.