Null Modems are used to interconnect two computers with similar RS-232 ports. If both ports are DTE or both DCE you cannot connect them directly together. You need a Null Modem.
Address the most common RS-232 problem; the reversal of Transmit (pin 2) and Receive Data (pin 3). Interconnect two computers with similar RS-232 ports without a LAN. Most gender combinations available.
Null Modems are used to interconnect two devices with similar RS-232 ports. If both ports are DCE, you cannot connect them directly together. You need a null modem to cross TD to RD, DTR to DSR, and RTS to CTS.
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