Discover the heart of industrial communication: RS 485

Two key Com RS-485 ports for connecting devices over long distances

Wondering how electronic devices can communicate securely in harsh or industrial environments? RS-485 is the answer. This serial communication standard is the key to connecting devices over long distances and resisting electrical noise in industrial environments.

There are devices that have two RS-485 COM ports. These devices are often referred to as "RS-485 converters" or "RS-485 repeaters". Devices with two RS-485 ports are used to extend the communication distance or to create a ring or star RS-485 network.

In this post we are going to go into the world of data transmission, we are going to explain what RS-485 is, what are the advantages of devices with two RS-485 COM ports and why they have become an essential solution in automation and modern industry.

WHAT IS RS-485?

RS-485 is a serial communication standard used to transmit data between electronic or computer devices over a cable. It is known for its ability to communicate information over long distances, up to 1,200 metres, and for its resistance to electrical noise, making it ideal for industrial and automation applications.

In more technical terms, RS-485 is a specification that defines the electrical signal, communication protocol and network typology. It uses a differential transmission scheme, meaning that it sends data using two communication lines: one line to transmit data at a high voltage level (1) and another to transmit data at a low voltage level (0).

WHAT IS EQUIPMENT WITH TWO COM - 485 PORTS?

When the length of the cabling exceeds 1,200 metres at a moderate transmission speed, it is necessary to use equipment with two RS-485 COM ports, also known as RS-485 "converters" or "repeaters". By using such devices, longer distances can be achieved without loss of communication quality and integrity.

In a typical configuration, an RS-485 converter or repeater has two RS-485 ports, one called "A" and one called "B". When a device sends data to port "A", the converter/repeater receives the data and retransmits it to port "B", and vice versa. This allows the data signal to extend beyond the distance limit that RS-485 alone can cover.

In addition to extending the distance, RS-485 converters or repeaters are also useful for creating networks with more complex typologies, such as ring or star networks, allowing multiple devices to be connected in a larger system.

INDUSTRIAL COMPONENTS WITH TWO RS-485 COM PORTS

At Grupos EOS Ibérica we are importers and manufacturers of industrial components. Therefore, we have a wide range of industrial PCs with two COMO RS-485 ports. These are our equipments that have this type of ports:

- eRX CL-J1900-PCI

- eRX CL-J1900 IGN

- eRX CL-J1900 TPM V2

- eRX CL-J1900V5

- eRX i5-1135G7

- eRX i5 1135G7-V2

- eRX i7-7700HQ

- eRX i7-10510u

FEATURES OF EQUIPMENT WITH TWO RS-485 COM PORTS

Equipment with two RS-485 COM ports, such as converters or repeaters, have some key features that make them useful and versatile in industrial communication applications. Some of these features include:

-Node growth: equipment with two RS-485 COM ports allows more nodes or devices to be added to the network.

-Flexible typologies: with this equipment, more complex network typologies can be configured, such as ring or star networks, which provides greater flexibility in the arrangement of the connected devices.

-Half-Duplex Communication: Like the RS-485 standard, equipment with two RS-485 COM ports typically supports half-duplex communication, which means that devices can send and receive data, but not simultaneously. This is suitable for applications where bi-directional communication is not necessary all the time.

-Power and isolation: some equipment can provide power and isolation to connected devices, which ensures stable communication and protects the devices from possible interference and electrical noise.

-Configurable Baud Rates: these devices often allow the data rate to be adjusted to suit the specific needs of the application, allowing the communication speed and distance to be balanced according to system requirements.

-Standards compatibility: equipment with two RS-485 COM ports is often compatible with RS-485 standards and other industrial communication protocols, making it widely used and easy to integrate into existing systems.

In conclusion, equipment with two RS-485 COM ports are essential tools in industrial and automation applications that require secure long-distance communication and the ability to connect multiple devices on the network. Their versatility and the ability to connect multiple devices on the network. Their versatility and ability to extend the capabilities of RS-485 communication make them essential components in many industrial systems and networks.