The VT-MODEM-4 is an industrial telephone modem produced by Sixnet. It supports all standard Hayes AT commands, Fax Class 1 and Class 2 commands and S-registers, so it can be set up as an external modem on any PC. The VT-MODEM-4 is compatible with most telecommunications or dial-up networking software. The VT-MODEM-4 allows easy access to PLCs, Sixnet I/O and other devices via dial-in telephone connections or leased line connections. The modem can be DIN rail or panel mounted for convenient and easy installation adjacent to other DIN rail components inside of new or existing enclosures. Most Windows software can communicate through a VT-MODEM-4 to remote devices to perform file transfers, diagnostics, program debugging and many other operations.