英语翻译RS485 is a multi-drop network – i.e.many devices can com

英语翻译
RS485 is a multi-drop network – i.e.many devices can communicate with each other over a single two wire cable connection.The RS485 cable requires to be terminated at each end of the cable.A link is provided to allow the cable to be terminated if the device is physically positioned at either end of the cable.
In this example the data transmitted by the FT232R is also received by the device that is transmitting.This is a common feature of RS485 and requires the application software to remove the transmitted data from the received data stream.With the FT232R it is possible to do this entirely in hardware – simply modify the schematic so that RXD of the FT232R is the logical OR of the SP481 receiver output with TXDEN using an HC32 or similar logic gate.