What is RS485 RS232?
RS485 was designed to address the multi-drop limitation of RS422, allowing up to 32 devices to communicate. An RS232 serial bus consists of just two communication wires - one for sending data and another for receiving. As such, serial devices should have two serial pins: the receiver, RX, and the transmitter, TX.
What are RS-485 design guidelines?
This application report presents design guidelines for engineers new to the RS-485 standard that can help themaccomplish a robust and reliable data transmission design in the shortest time possible. RS-485 is an electrical-only standard.
How do RS-485 nodes work?
The RS-485 standards suggests that its nodes be networked in a daisy-chain, also known as party line or bustopology (see Figure 3-1. In this topology, the participating drivers, receivers, and transceivers connect to a maincable trunk via short network stubs. The interface bus can be designed for full-duplex or half-duplex transmission
Why do RS-485 applications benefit from differential signaling over twisted-pair cable?
RS-485 applications benefit from differential signaling over twisted-pair cable, because noise from externalsources couple equally into both signal lines as common-mode noise, which is rejected by the differentialreceiver input.
Chapter 12 The Communication Function of FBs-PLC