What is null modem cable?

A null modem cable is a type of serial cable that allows for communication between two devices without the need for a modem or other hardware. It is typically used to connect two computers directly to each other for data transfer, networking, or other purposes.

Null modem cables are typically used with RS-232 serial ports and come in various configurations such as DB9, DB25, or USB connectors. They are often used in situations where two devices need to communicate but do not have a direct network connection.

Null modem cables are commonly used for file transfers, software updates, and configuration changes between computers or other devices. They are widely used in industries such as telecommunications, industrial automation, and computer networking.