Why devices use RS485 serial communication

RS485 serial communication is often used in industrial control fields and long-distance communication environments for the following reasons:

1. Strong anti-interference ability:

RS485 adopts differential signal transmission, which has good anti-interference ability and can maintain stable communication quality in electromagnetic interference environment.

2. Long-distance transmission:

 RS485 supports a communication distance of up to 1200 meters.It is suitable for large area factories, buildings and other scenes requiring long-distance communication.

3. Multi-machine network: 

RS485 supports multiple devices to share the same bus, and multiple devices can be connected through the bus.The number of communication lines is reduced, and the cost is reduced.

4. High data transmission rate: 

RS485 supports high data transmission rate, which can meet the application scenarios with strong real-time performance.Uch as industrial automation control.

5. Multi-point communication: 

The RS485 serial port supports multiple devices to communicate on the same bus.This means that it is possible to communicate bi-directionally with multiple slave devices through one master device.This feature makes RS485 suitable for centralized control systems and distributed data acquisition systems.

6. Flexibility and expandability: 

The RS485 serial port can be flexibly configured in half-duplex or full-duplex mode.And the interconnection with other serial interface standards (such as RS232 and RS422) can be realized by using the RS485 to Ethernet Converter.This flexibility and extensibility makes RS485 a universal serial communication solution.

Principle of RS485 to Ethernet Converter

RS485 serial port is a commonly used serial communication interface standard.It is widely used in industrial automation, instrumentation, communication equipment and other fields.

RS485 to Ethernet Converter is a device that connects RS485 serial devices to the network.The RS485 to Ethernet Converter first needs to convert the RS485 signal into a standard Ethernet signal, and after the RS485 serial port conversion,The serial server sends the Ethernet signal to the connected network. It is connected to a local area network or the Internet through an Ethernet interface.The serial server usually has a network communication protocol stack such as TCP/IP or UDP to support data transmission in the network.

The RS485 to Ethernet Converter parses and processes the data received from the Ethernet.It can parse the data frames sent by serial devices and extract useful information according to the preset protocols or rules.At the same time, the serial server can also process, convert or process the data according to the requirements to meet the requirements of data interaction.After parsing and processing, the serial server can forward the data to the specified terminal device or server according to the set rules.It can send data to the host computer or monitoring center by active upload, timing send, polling and so on.At the same time, the serial server can process and respond to the received commands and instructions.

Role of RS485 to Ethernet Converter

RS485 to Ethernet Converter is a kind of network device, which is mainly used to connect RS485 serial devices to the network.And realize remote control and monitoring through that network. Its functions include:

●Remote control and monitoring:RS485 to Ethernet Converter can convert serial devices,Such as sensors, PLC, industrial controllers, etc., are connected to the network to achieve remote control and monitoring through the network.The user can remotely access the serial port equipment through a computer, a mobile phone or other network terminal equipment,Obtain data in real time, send instructions, or perform configuration debugging.

●Realize the networking of serial devices:RS485 to Ethernet Converter can convert traditional serial devices into network devices.Connect it to the existing network infrastructure.In this way, not only the accessibility of the equipment is improved, but also the interconnection and intercommunication between the equipment can be realized.Facilitate centralized management and sharing of data.

●Serial port expansion:RS485 to Ethernet Converter supports multi-channel serial port connection, and can be converted to Ethernet through serial port.Multiple serial devices are connected to the same server to expand the number of serial ports.This reduces the footprint of the hardware device, simplifies cabling, and improves the flexibility and scalability of the device.

●Data forwarding and centralized management:RS485 to EthernetConverter can forward the data collected by the serial device to the specified terminal device or server through the network.Realize the centralized management and monitoring of data.It can parse, process and forward the data according to the set rules to ensure the security and accuracy of the data.

Why is RS485 more popular than RS232?

RS485 And RS232 are two familiar serial communication interface standards, although they are different in communication mode and electrical characteristics.However, RS485 is more popular than RS232 for the following reasons:

1. Long-distance transmission: The RS485 serial port supports long-distance transmission, up to 1200 meters, while the RS232 interface has a shorter transmission distance.It is usually about 15 meters.This makes RS485 suitable for application scenarios that need to transmit data in a wide range, such as industrial control systems, building automation systems, and so on.RS232 is more suitable for shorter distance local area communication.

2. Multipoint communication: RS485 serial port supports multipoint communication, which can establish communication connection between a master device and multiple slave devices.The RS232 interface only supports point-to-point communication and one-to-one connection. This makes RS485 suitable for data interaction and control between multiple devices.For example, the networking of sensors, actuators, PLC and other devices in industrial automation systems.

3. Anti-interference ability: As RS485 adopts differential signal transmission, it has strong anti-interference ability.And can effectively eliminate electromagnetic interference and signal crosstalk.In contrast, the single-ended transmission of RS232 is susceptible to interference, especially in industrial environments.Because of the large number of equipment and the large electromagnetic noise, RS485 can ensure the reliable transmission of data.

4. Data transmission rate: The RS485 serial port supports a higher data transmission rate, generally up to 10 Mbps.The transmission rate of RS232 is generally around 115.2 kbps.This enables RS485 to meet the demand for high-speed data transmission, and is suitable for application scenarios with large amount of data and high real-time requirements.

In addition, although RS485 and RS232 are different in some aspects, they are both reliable serial communication interfaces.The choice of which interface to use should be evaluated and selected based on the specific application needs.

How to use RS485 to Ethernet Converter

Using RS485 to Ethernet Converter mainly includes the following steps:

1. Connect hardware devices: First, connect the RS485 serial devices to be connected, such as sensors, PLC, etc.Connect to the RS485 port of the serial server through the RS485 serial port.Ensure that the connection is stable, and set the serial port parameters such as baud rate, data bit and stop bit according to the equipment requirements.

2. Connect to the network: Connect the Ethernet interface of RS485 to Ethernet Converter to the existing LAN or Internet.Make sure that the network connection is normal and the device can obtain the IP address.

3. Configure serial server: Use the management interface or configuration tool provided by RS485 to Ethernet Converter.Configure the serial server. Set network parameters, such as IP address, subnet mask, gateway, etc., to ensure that they match the network environment.At the same time, it is also necessary to set the serial port parameters, such as baud rate, data bit, stop bit, etc., to be consistent with the connected serial port device.

4. Data parsing and forwarding: Set the data parsing rules and processing mode of RS485 to Ethernet Converter as required.According to the data frame structure sent by the serial port equipment, an analysis rule is preset, and the required data content is extracted.Can be configured and customized if there are special data processing needs.At the same time, set the forwarding mode of data, such as timing upload, active push, polling, etc.Send the data to the specified terminal device or server.

5. Remote access and control: use computers, mobile phones and other terminal devices to access serial servers on the local network or the Internet.Open the corresponding access tool or application, and enter the IP address and user name and password of the serial server to connect and log in.Through the visual interface, the data and status information of serial devices can be viewed in real time, and remote control and monitoring operations can be carried out.

Configuration of RS485 to Ethernet Converter

Q: RS485 to Ethernet Converter IP and port configuration method

Answer: First answer the configuration method of RS485 to Ethernet Converter IP: connect RS485 to EthernetThe IP of the Converter and the IP of the network end device are set as the same network segment IP;

There are two ways to set the port:

The First case is when the RS485 to Ethernet Converter is used as a TCP Sever and the network terminal equipment is used as a TCP Client.The remote port number of the network terminal needs to be set as the port number of the serial server;

The second case is when the RS485 to Ethernet Converter is used as the TCP Client and the network terminal device is used as the TCP Server.The local port number of the network terminal needs to be set to the port number of the server.

The specific operation steps can be found in the "Software Design Manual" of the corresponding products on the official website.There are detailed steps in the four working modes in "Socket function".

Q: How to configure and connect the RS485 to Ethernet Converter?

Answer: Search for "PUSR", enter the homepage of the official website, and search for the corresponding product model.Locate "User Manual" in the "Download" tab.

In the User Manual, there are four working modes under the Socket function.The steps of configuration and connection debugging in different working modes of RS485 to Ethernet Converter are described in detail.

Q: RS485 to Ethernet Converter Port Setup Software

A: Log in to PUSR in the same way as above, and in the corresponding product details page," [PC Test Software]" corresponding to the "Download" label, for example, [PC Test Software] o in Figure 410s below

Q: How to configure the RS485 to Ethernet Converter when it is connected to the network?

A: There are two situations. First, when the network terminal is used as a TCP server, the serial server is used as a TCP Client.The Local Port Number needs to be set. Set the remote port of RS485 to Ethernet Converter to be consistent with the local port number of the network side;

The second is that when the network terminal acts as a TCP Client, the serial server acts as a TCP Sever. The Remote Port Number needs to be set.The local port of the serial server is set to be consistent with the remote port number of the network end;

Q: How to configure RS485 to Ethernet Converter

A: There are three ways to configure.

The first one is to set the software configuration.Download the setting software of the corresponding product (also in the "Data Download" tab of the corresponding product on the official website).The serial port server is connected with the computer end, and the IP of the serial port server and the computer end is set as the same network segment,Open the setting software to search the IP of RS485 to Ethernet Converter, and the parameters can be modified only after the RS485 to Ethernet Converter is found.Parameters cannot be modified if they cannot be found;

Second: Built-in web configuration.Input the IP address on the back of the RS485 to Ethernet Converter device on the browser, log in to the built-in webpage, and modify the parameters;

Third, AT instruction configuration. Connect the RS485 to Ethernet Converter to the computer and open the test software "USR-TCP232-Test".Input the corresponding AT command in the software design manual to set the parameters.

Tips for Using RS485 to Ethernet Converter

1. Q: Why does the device use RS485 serial communication?

A: RS485 devices can be connected to a computer and dropped multiple times in multiple places in a network style configuration.Devices can be up to 4,000 feet (1,220 meters) away and up to 32 nodes (devices) can be connected before a repeater is required.Repeaters can be used to connect more nodes up to the addressable limit of the equipment used (typically 256).

2. Q: How do I connect a computer to an RS485 device?

A: You can use the RS232 to RS485 to Ethernet Converter, or install the RS485 serial port card in the computer.A PCI bus, PCMCIA/CardBus, or ISA bus card may be used.

You need to know how many wires are used on the RS485 port of the device you need to connect.The data (A) and data (B) lines and ground are "2-wire" 485 connections,If there are more connections and they are labeled TD (A) and TD (B) and RD (A) and RD (B)) and ground, you need a "4-wire" converter.

3. Q: What to look for in RS485 to Ethernet Converter to work with Windows?

A: It is recommended to use a converter or interface card with automatic send data control in Windows and other multitasking operating systems.This is important for half-duplex 2-wire operation. Otherwise, data may be lost.If you program with Visual Basic, sending data controls automatically can simplify your life.

4.Q: What type of connector is used for RS485?

A: The RS485 standard does not specify the type of connector or pinout.The RS485 connector can be DB9, DB25, terminal block, RJ11, RJ45 or one of the circular DIN connectors.

5. Q: What is the maximum connection distance for RS485 devices?

A: RS485 without repeaters has a maximum distance of 4000 feet (1220 meters) and a baud rate of up to 90Kbps.Add an RS485 to Ethernet Converter or Optically Isolated Repeater every 4000 feet to extend that distance.

6. Q: Can I increase the RS485 signal to add more nodes or distances?

A: Not exactly. You can repeat and refresh the signal periodically along the cable, but don't push it above spec.B & B offers different styles of RS-485 repeaters/boosters such as 485op or 485OPDR.Allows you to add an additional 32 nodes (or 4000 feet) to the RS485 network.

7. Q: Why do I need an RS485 repeater with more than 32 nodes/devices?