Which is a physical layer standard for serial communications between two or more devices?
Which is a physical layer standard for serial communications between two or more devices?
RS232 is a standard for serial communication that defines the physical layer for connection between two or more devices. It specifies the electrical characteristics and timing of signals, as well as the size and shape of connectors. Among the provided options, RS232 is widely recognized as a physical layer standard for serial communications.
RS-485 became the standard physical layer for automation protocols such as Modbus RTU and PROFIBUS. This is because it supports longer runs, higher speeds, and multiple devices. Source: https://automationcommunity.com/rs232-rs422-rs485/#rs-485 RS232 is only between two devices.