一、引言将微处理机应用于S cpc 卫星通信地球站,是我们在西藏卫星地球站设备中的成功之处,随着设备的完善和提高,我们对该微机系统进行了改造。图1是西藏卫星地球站MAC 分系统的系统框图。由于该设备和主控台设在同一机房里,距离较近,所以采用了PIA 并行接口实现MAC 机和主控机IBMPC/XT 之间的数据传输。这样就限制了主控台的灵活性,当距离拉远时就会产生数据错误,为了克服这一问题,我们设计了一个符合RS232C 电平的标准串行接口. I. INTRODUCTION The application of microprocessors to S cpc satellite communication earth stations is a success of our satellite earth station equipment in Tibet. As the equipment is improved and improved, we have reformed the microcomputer system. Figure 1 is a system block diagram of the Tibetan satellite earth station MAC subsystem. As the device and the console are located in the same room, close, so the use of PIA parallel interface to achieve master machine and host computer IBMPC / XT data transfer. This limits the flexibility of the console and creates data errors as the distance gets further. To overcome this problem, we have designed a standard serial interface that is RS232C-compliant.