智能232转485原代码，1个232进4个485出，上位机选者端口（C51），需要有KEIL 软件开发.-232 to 485 Intelligent original code, a 232 into four 485. PC elections were port (C51), the need for KEIL software development.

RS485转RS232电路原理图及PCB图-RS232 RS485 switch PCB circuit diagram and map

232串口转换为485接口通讯的原理图，可以利用这个自制市场上卖的232转485设备器。-232 serial conversion of 485 communications schematics, this can be made use of the market to sell 232 to 485 for equipment.