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UART RS485 to Ehernet Modem ModBus Gateway Long Distance Wireless Serial Device | eBay
Amazon.com: USR-G771-E RS232/RS485 to LTE CAT 1 Cellular Modem Support LTE and GSM TCP UDP Transparent Transmission with SIM Card Support HTTP, MQTT, SMS (Modbus RTU to TCP Version NO Adapter) :
RS-485 Multi-Drop Bus Self-Healing Ring Fiber Optic Modem
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