【摘要】 文中所设计的船舶导航数据转换器可以只依据一种导航数据,经过数据转换后输出电罗经和GPS两种信号,保证电罗经设备与GPS设备的正常工作。转换器信号的接收与发送是通过不同串口进行,所以有必要扩展串口来解决串口太少的问题。对比分析目前较常用的几种串口扩展方案,本文提出一种采用P89C669作为数据转换的主处理器,AT89C2051作为串口扩展芯片的低成本方案,实现利用并口扩展串口的功能。更多还原

【Abstract】 The navigation data converter of ship can output gyrocompass and GPS signals after the data conversion, which just bases on gyrocompass (or GPS) input signal. Thus, the gyrocompass equipment and GPS equipment can operate normally. It is necessary to expand the serial ports, because the signals of the data converter are received and sent through different serial ports. Compared with some schemes of serial ports expansion, a low cost scheme, which can realize the serial ports expansion using parallel port, is pro- posed in this paper. The MCU P89C669 is the main MCU of the data converter, and the MCU AT89C2051 is acting as the convert- ing IC chip of the proposed scheme.更多还原