【摘要】 阐述了一种远程微机分布式调度系统中测压终端机（ＲＴＵ）的软硬结构设计。该ＲＴＵ以单片机为核心，用无线通讯方式完成数据采集。采用抗干扰性强的ＦＳＫ（移频键控）的调制方式，以硬件调制解调和用单片机定时器产生代表“０”、“１”的两种频率的软件调制的方式，实现单片机与电台、数传机的接口设计，从而保证了ＲＴＵ与调度端的可靠通讯。为使ＲＴＵ避免出现死机状态，提出了一种独特的硬件监视定时器实现系统自动复位技术。从而使系统抗干扰性强，工作稳定可靠更多还原

【Abstract】 illustrates the hardware and sofware design of a pressuremeasurement RTU in a remote microcompute-based distributed dispatching sys-tem. The RTU, which adopts a single-chip microcomputer as its Kernal, per-forms data aquisition through radio communication. By utilizing FSK modulating method, which has high interference rejection capability, and by combining hard-ware modulation and demodulation with software modulation in which two kinds of frequency representing "0" and "1" are generated by the timer in the single-chip computer, the interface design between the microcomputer and transceiven digital data transmitter has been realized, securing the communication between the RTU and the dispatcher. A peculiar hardware watchdog timer technique is proposed to avoid the dead halt of the RTU, leading to the high interference rejection capability, stability and reliability of the system.更多还原