Null Modem Cables

Need a null modem cable but aren’t sure of the difference between those and serial cables? Both may use db9 female rs232 so it is easy to confuse the cables. While a null modem adapter may indeed have a db9 f to connect serial devices to a pc via serial port they have a unique pinout which uses a null modem connection. Devices such as an external modem are considered DTE and will use a standard rs 232 cable while Data Communications Equipment, DCE for short are the ones which require a Null Modem Cable.