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2Pack TTL to RS485 Adapter Module, 485 to TTL 33V50V Signals Serial Port Power Supply converter with Indicator Lightsstrong>Features:strong>1 Wide voltage power supply (30V 30V), the limit voltage of 33V, it is recommended to use within 30V, the minimum voltage is higher than 28V2 Has a very high EMc and EMI performance3 compatible with 33V and 50..