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三菱FX2N 48MR，準(zhǔn)備和計(jì)算機(jī)進(jìn)行通訊。買了個(gè)232BD模塊。現(xiàn)在232BD和計(jì)算機(jī)上的串口接線，我看到資料上有不同說法，請(qǐng)問哪種是對(duì)的�。�
第一種說法：
                      232BD                                     計(jì)算機(jī)串口
                                            RD （2）-------------------------------- 5
                                            SG  （5）-------------------------------- 3
                                            SD （3）  -------------------------------- 2
第二種說法：
                     232BD                                       計(jì)算機(jī)串口
                   RD(2)      ---------------------------         2
                                      SD(3)     ----------------------------------3                                                
                                      ER(4)--------------------------------------4
                                      SG(5)--------------------------------------5
                                      DR(6)  -----------------------------------6                              

我怎么聯(lián)不上了，請(qǐng)大家指教