支持多点远距离通信的RS-232串行总线系统

RS-232 Serial Bus System Supporting Multi-point Long-distance Communication

针对RS-232标准的单端接口信号、抗干扰能力弱、速率低、通信距离短、只能实现点对点通信且没有自我检测功能等问题,提出一种支持多点远距离通信的RS-232串行总线系统.通过升级单端信号为差分信号,增加冲突检测电路、载波侦听电路与总线控制电路等,配合成熟的标准的冲突检测和回退算法,不仅解决了RS-232标准存在的问题,提高了信号抗干扰能力和传送速率,增加了通信距离,而且实现了多个RS-232设备间的相互通信及总线的自我检测功能.

There are many problems in RS-232 standard, including single-end signal with poor ability of an-ti-jamming, slow rate of data transmission, short distance of communication, only supporting point to point communication,no self-detecting function and soon .In order to solve these problems, this paper designs a new RS-232 serial bus system which supports multi-point long-distance communication. By updating single-end signal to differential-pair signals, adding the collision detection circuit, carrier sense c ir cu it, and bus control circuit and by using mature standard conflicting detection and back-off algorithm, the new RS-232 serial bus system not only solves the problems o f RS-232 standard, improves the anti-jamming ability and the transmission rate, and increases the communication distance, but also realizes the communication between multiple RS-232 devices ,and achieves the bus self-detect function.