Rs485/232 To 4-channel 485 Serial Port Hub 485 Serial Port Is Divided Into Four 4-port 485 Hub 485hub94 - Tool Parts - AliExpress
RS485HUB : 4-Port RS485 Repeater / HUB with RS232 Port - R.E.Smith Serial Communications RS485 RS232 RS422
Optical Isolated RS485 Hub Repeater Allocator
Urs104A RS485 Hub, 1 Channel Input, 4 Channels Output. Half-Duplex, One Way Communication, Designed for The PTZ Control on CCTV System - China RS485 Hub and RS485 Splitter