Linksys FGMM1000 - Application Settings: UPnP and Ser2 Net; UPnP IGD Settings; Ser2 Net RS232 Configuration

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.