Great prices on RS422 RS232 RS485 Wiring Hub, 16 Port, full duplex, half duplex, expand to 496 nodes, surge protection Model 290 - RS-232 to RS-422/RS-485 Concentrator - Wiring Hub Features Break RS-485 Limit, Expand to 496 Nodes 16 Port Capacity Each Port Settable to RS-422 or 2 Wire RS-485 Provide...