Null Modems are used to interconnect two RS232 Devices with similar RS232 ports. If both ports are DTE or both DCE, you need a null modem to connect them directly together. This Null modem features Male DB9's on both sides, so it will covert a Female (with holes) DCE Serial port to a Male (with pins) DTE Serial Port.
Use this null modem device to connect two female DB9 DCE connectors together. Null modem crosses pins 2 and 3.
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