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故障现象:无法使用新买的com连接线。 排除过程:拆开九针插头,露出焊点,比较,发现连线方式不同,具体如下图所示:
Symptom: can not use the newly purchased com cable. Exclusion process: Disassemble the nine-pin plug, exposing the solder joints, compare and found that the connection is different, as shown below: