录DEC6713的UART串口的测试程序。需要将板上的跳针JP3、JP5各自短接，将UART通道A 和通道B均配置为RS232方式。-Recorded in the UART serial DEC6713 test procedures. Need to jump on-board pin of JP3, JP5 their shorted to UART channel A and channel B are configured for RS232 mode.
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