![]() ![]() It uses the same pinout structure on each end of the cable and is what you commonly use to connect your computer to an external device with a serial port. What is the difference between a Null Modem and Straight Through Serial Cable?Ī straight through serial cable is used to connect a DTE device to a DCE device. Data transfer speed is limited to 115 kb/s but is often much less due to cable length. The length of a null modem cable is limited to 30 feet, so physical proximity is necessary to use an RS232 null modem. They are also used by computer gamers to directly connect their machines together for more fluid gameplay. Null modem cables are also called crossover cables because the transmit and receive pins on one end are flipped.Ī null modem serial cable is usually used to connect two computers together for the purposes of file transfers. DTE devices can be seen as computers and DCE devices as modems. More technically, two Date Terminal Equipment (DTE) devices are connected without the intervention of a Data Communication Equipment (DCE) device. ![]() Software emulation of null modem connections.Ī null modem is a cable that is designed specifically to allow a direct connection between two serial devices by using their RS232 communication ports.What is the difference between a Null Modem and Straight Through Serial Cable?.
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