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Various types of connecting wires are often encountered during use. These connecting wires may look similar in appearance, but their internal structures are completely different and cannot be mixed. If these connecting wires break during use, many users often do not know what to do. Below are the common wiring methods for these connecting wires for repair or troubleshooting. Before introducing, explain some commonly used market terms. Nowadays, all connectors can be divided into two categories: male and female connectors. Public connector: Refers to all needle type connectors. Female head: Refers to all socket type connectors. All pins of the connectors have uniform regulations and are printed on the connectors. Please pay attention to checking when connecting. The pins that were not mentioned during wiring are all suspended and ignored. The following is a list of serial and parallel port pin functions for advanced users to use when maintaining cables or connectors.