10pcs TTL to RS485 RS485 to TTL Bilateral Module UART Port Serial Converter Module 3.3/5V Power Signal
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Direct purchase from the factory 
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ntFeatures:
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nt1. Compatible with 3.3V and 5.0V power supply.
nnt2. Compatible with 3.3V and 5.0V signal.
nnt3. Absolute using imported chips, industrial design, anti-interference ability, while using more effective mine design can be used in the industrial field and harsh field environments, the working temperature of -40 Celsius to + 85 Celsius transmission distance up to 1 kilometer (made with 850 meters of cable F1.5 tests recommended in the 800 meters, more than 800 m, please add repeaters).
nnt4. Semi-hole pads, onboard module, thin PCB, having a thickness of 0.8mm.
nnt5. Has RXD, TXD signal indicator light, monitor send and receive status.
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nntPackage includes:
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nnt10 x Converter Module
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