Please note: This is not EIA/TIA-561 or similar common pinout. These units can only be used when paired together. They cannot be used as you would any other similar adapter.Can only be used in pairs to work (2 at the same time), can not be used alone, please read the instructions carefully before buying "Product Instructions: 1.DB9 port, which expands display devices through network cables 2. This switch cable can be used to switch to the RS232 serial port. The DB9 9-pin serial port is used to connect a host computer or various monitors. 3. The network cable can be connected to the network cable interface of the two switch cables respectively. 4. The product transfer cable only uses the network cable as the transmission medium, instead of converting the network signal to the DB9 signal. RJ45 to RS232 patch cable Male or female connector transmits DB9 signal via cable.
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