说明：  485H接口转换器是RS232至RS485转换器，可将发送数据TD和接收数据RD转换成差分半双工RS485信号，使RS232信号传输距离大大加长，是远距离点到多点通信的最佳选择。本转换器无需外接电源，自用串口转换电源；亦无需RTS信号控发，保证软件的广泛适应性
(485H interface converter RS232 to RS485 converter is, can send data and receive data RD TD into a half-duplex RS485 differential signal to RS232 signal transmission distance significantly longer, is the best choice for long-range multipoint communication. The switch eliminates need for external power supply, power supply for personal use serial conversion also do not need to send RTS signal is controlled to ensure that a wide range of adaptive software)