RBH Electronics Security Products [India] P Ltd. Manufactures TCP/IP LAN Gateway with Screw down Power Connector. RBH Electronics Security Products [India] P Ltd. Manufactures Integrated Access Control and Enterprise Security Management System. The TCP/IP LAN Gateway with Screw down Power Connector is an inexpensive way to connect RBH Access Control panels to a host via the Internet or a local/wide area network. Both RS-485 and RS-232 are supported and are selectable via hardware switch.