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4AI+ 4AO RS485 Etherent Switch 4 Port Value ModBus TCP RTU I/O Networking Module | eBay
8 RS485 Ports Serial Ethernet Converter
SIM Card Wireless Router and Switch for Industry Use DTU with RS232 / RS485 4G Modem Connect to Terminal Device - China 4G Industrial Wireless Router and 4G LTE Router price | Made-in-China.com