20pcs TTL to RS485 Module Hardware Automatic Flow Control Module Serial UART Level Mutual Converter

Features:? ? (1) The module is fully considered mine design, long-distance transmission signal 485 in the wild, the module Connected to the ground terminal is connected to the earth, can play a very good anti-jamming and anti- effect, more secure; it can not connect with the ground when the indoor short-distance transmission.? (2) Using the standard 2.54 pitch design, easy secondary development.? (3) Has a 120 ohm termination resistors, shorted R0to enable the termination resistor.? (4) Support multi-machine communication, allowing access at up to 128 devices on the bus? (5) The module can be hot swapped, the signal does not appear dead phenomenon.? (6) A large area of copper to prevent interference. (7) Compatible with 3.3V and 5.0V power supply.? (8) Compatible with 3.3V and 5.0V signal.? (9) 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 ?ﾣ to + 85 ?ﾣ 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).? (10) Semi-hole pads, onboard module, thin PCB, having a thickness of 0.8mm.? (11) Has RXD, TXD signal indicator light, monitor send and receive status.? ? Note:? ? Only one in the whole network, 3.3V and 5.0V power supply, RS485 signal perfectly compatible with automatic flow control module.? Without Receiving - launch control, this module is as simple to use with your serial port operations.? ? Package Included: ? 20 x TTL To RS485 Module Hardware Automatic Flow Control Module?