Linksys FGMM601 - Ser2 Net (FGMM1000 Only)

UPnP Settings
Enable UPnP IDG to limit the service to only those devices that support IGD.
Ser2Net (FGMM1000 only)
RS323 to Network
Connect devices with RS232 serial interfaces for reliable data transmission to other devices or network server
applications.