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Delock Products 64122 Delock Serial RS-232/422/485 Adapter DB9 female to RJ45 jack
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Tripp Lite DB25 to RJ45 Modular Serial Adapter M/F RS-232 RS-422 RS-485 - Walmart.com
USB RS485 Adapter to RJ45 FTDI chip inside
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DB9 to RJ45 Modular Serial Adapter, RS-232, RS-422, RS-485 | Eaton
Moxa Americas Inc. - 2 Port RS232/422/485, RJ45 Serial Device Server WT - NPORT IA-5250-T - Tessco