Ethernet to RS485 Converter for Multiple RS485 Devices

PublishTime： 2023-11-16 Article Source：世强

RS485 serial bus is widely used in the communication distance from tens of meters to several kilometers. RS485 uses balanced transmission and differential reception, so it has the ability to reject common mode interference. Coupled with the high sensitivity of the bus transceiver, which can detect voltages as low as 200 mV, the transmitted signal can be recovered from kilometers away.

RS485 adopts a half-duplex working mode, and only one point can be in the sending state at any time, so the sending circuit must be controlled by the enable signal. RS485 signal to Ethernet signal, that is, Ethernet to RS485 Converter, has its figure in industrial, security, remote meter reading, and other scenarios, using its signal conversion function to achieve signal conversion and improve the network.

How it works

RS485 to Ethernet provides the function of converting serial port to network, which can convert RS485 serial port to TCP/IP network interface and realize bidirectional and transparent data transmission between RS485 serial port and TCP/IP network interface. The serial device can immediately have the function of a TCP/IP network interface, connect the network for data communication, and expand the communication distance of the serial device.

RS485 is a differential signal negative logic, + 2V ~ + 6V represents "1", and -2V ~ -6V represents "0". RS485 communication interface is divided into two types, one is a two-wire system, and the other is a four-wire system. The two-wire system is a half-duplex communication mode, and the four-wire system is a full-duplex communication mode. RS485 communication interface, strong anti-interference ability, good anti-noise interference. In industrial control, the RS485 bus is widely used because of its simple interface, convenient networking, long transmission distance, and other characteristics.

The RS485 interface is a half-duplex data communication mode. The half-duplex network composed of the interface is generally a two-wire system in use, and the shielded twisted pair is often used for transmission. Such a wiring mode is a bus-type topology, and 32 nodes can be connected to the same bus at most. RS485 in the communication network uses a master with multiple slaves. In most cases, a simple pair of twisted pairs is used to connect the two ends of the "A" and "B" "of each interface when connecting RS485 communication. The RS485 interface connector adopts the 9-core socket head of DB-9, the RS485 interface of the intelligent terminal adopts DB-9, and the keyboard interface RS4485 connected with the keyboard adopts DB-9.

Benefits of Ethernet to RS485 Converter

The wiring is simple: only 2 wires are needed, and the shielded wire interface of the network cable is adopted;

Long communication distance: differential mode communication is adopted, and the communication distance is long;

Multi-machine networking: RS485 supports mounting multiple terminals online, and realizes multi-machine communication by means of query-response;

Solution of Ethernet to RS485 Converter

RS485 to Ethernet hardware converter is divided into two types: Ethernet to RS485 Converter and serial networking module.

Ethernet to RS485 Converter realizes the conversion of the RS485 interface into a TCP/IP interface, and with the use of a virtual serial port driver on the computer side, the TCP/IP connection is virtually converted into a serial port again.

The virtual serial port driver creates virtual serial port numbers such as COM5 and COM6 in the driver layer of the computer and binds the remote Ethernet to RS485 Converter with the virtual serial port to realize communication.

After using the hardware and software system of the solution, the Rs485 device is equivalent to the expansion of the network, and the original hardware and software programs do not need to be modified.

Basic functions of RS485 Ethernet to RS485 Converter

Basic functions: RS485 serial port to Ethernet, bidirectional transparent transmission, support Modbus forwarding;

Guide rail installation: exquisite volume, standard 35mm guide rail installation, easy layout, and installation, convenient for later maintenance;

The operating mode of Ethernet to RS485 Converter:

TCP Server: As a Server, the device can be set with two TCP clients to perform transparent data transmission with the device at the same time, so as to solve the problem of simultaneous communication between multiple clients and the device. It can also be used as a standby network channel for switching communication;

TCP Client: As a Client, the device can be set to face four server addresses at the same time, actively initiate connections to the server, and as a Client, support the setting of custom heartbeat packets and handshake packets;

UDP Server: as the Server end, the device supports multiple UDP clients to transmit data with the device;

UDP Client: as the Client end, the device actively communicates with the UDP Server and transparently transmits data with the RS232 serial port;

UDP multicast: as the Client end, the device can realize the mutual communication between the devices in the multicast;

Http server: as the HTTP server, the device supports HTTP communication in the local area network through HTTP (get);

Ethernet to RS485 Converter for multiple RS485 devices

For the problem of connecting multiple 485 devices to one Ethernet to RS485 Converter, you can use multiple serials to Ethernet modules. Here is one possible solution:

1. Obtain an Ethernet to RS485 Converter with multiple serial interfaces. Such servers typically have an Ethernet connection and support multiple serial ports.

2. Connect each 485 device to a separate serial port through an adapter or dongle. These adapters convert 485 signals to serial signals.

3. Configure the Ethernet to RS485 Converter to map each serial interface to its corresponding 485 device.

4. Connect the Ethernet to RS485 Converter to your local area network or the Internet, ensuring that it has network communication capabilities with other devices.

In this way, you can manage multiple 485 devices simultaneously with one Ethernet to RS485 Converter. You can monitor and control each device by accessing the Ethernet to RS485 Converter through the network.

Application of RS485 Ethernet to RS485 Converter

RS485 Ethernet to RS485 Converter is widely used in various industrial automation and Internet of Things applications. Here are some common scenarios:

1. Remote monitoring and control: RS485 Ethernet to RS485 Converter can connect remote devices to LAN or Internet through the RS485 interface to realize remote monitoring and control of these devices. For example, Ethernet to RS485 Converter can be used to connect sensors, PLCs, meters, and other devices to a central monitoring system to monitor the status of the devices in real-time and operate and set them remotely.

2. Data acquisition and recording: RS485 Ethernet to RS485 Converter can connect multiple data acquisition devices (such as temperature sensors, humidity sensors, flowmeters, etc.) to the server through the RS485 interface to achieve centralized data acquisition and recording. This data can be used for analysis, report generation, and remote administration.

3. Device access to the cloud platform: Through the RS485 Ethernet to RS485 Converter, the device can be connected to the cloud platform to realize remote monitoring and management of the device. This can help realize the remote maintenance, upgrade, and fault diagnosis of the equipment, and improve the operation efficiency and reliability of the equipment.

4. Remote instrument display and control: through RS485Ethernet to RS485 Converter, instrument equipment (such as instrument display screen, control panel, etc.) can be connected to the remote terminal to realize remote instrument display and control. This is particularly useful in certain applications where real-time monitoring and operation of equipment is required.

5. Industrial automation system integration: RS485 Ethernet to RS485 Converter can be used as the core of industrial automation system to connect different types of equipment (such as PLC, human-machine interface, sensors, etc.) through RS485 interface, and exchange data and communicate with equipment. Realize the integration and control of the whole system.

Ethernet to RS485 Converter provides flexible and reliable serial port connection and enables remote management and communication via Ethernet. They are widely used in industrial environments to help improve productivity, reduce maintenance costs, and enable intelligent and automated control.

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