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What is the difference between RS485 and Ethernet?

December 19 , 2020

What is the difference between RS485 and Ethernet?

 

Many clients asked: Hey S4A, for the access controller, What's the communication port I need to take? 

RS485 or Ethernet, For better to understand, we will explain it in this way:


While Ethernet is the most commonly used communication protocol among multiple types of devices, ranging from consumer gadgets to industrial devices, TIA/EIA-485 commonly known as RS-485 is still broadly used in industrial devices even if it is older than Ethernet. Let's see why it is still in use and why, at S4A,we decided to use it as the standard communication protocol for our devices, Network access controller, such as ACB-001, ACB-002, and ACB-004

 

RS485

 RS485 controller

Many people are often confused when dealing with communication standards. Often, terms like ''RS-485'', ''USB'', and ''Ethernet'' are interchanged as if they could be switched and do the same job. But in fact, the RS-485 standard is only a physical layer standard. It defines the electrical characteristics of the transmitter and the receiver. On top of that, an application layer must be used to handle stuff like device addresses, checksum, packet collision, master/slave topology, frame construction, etc. In the case of Ethernet and USB, these protocols define both the physical and application layer in their communication standard.

 

If you're lost at this point, let's make an analogy with human communications. As humans, we use our voice as a transmitter and our ears as receivers. This is our physical layer, the way we transmit information. Another example of a physical layer in our digital era could also be SMS that transmits our messages. It is still a physical layer from our perspective. The application layer in the case of humans is language. This is how we organize information. There are hundreds of them and even if they use the same physical layer, they are not necessarily compatible.

 

Ethernet (IEEE 802.3) is the most broadly used network protocol these days. It is also a serial communication standard. Since it is used in so many modern networks, the question is why hasn't it replaced RS-485 and its other variations (RS-232, RS-422).

 

When comparing RS-485 with Ethernet both of them have advantages and disadvantages. The major drawback of RS-485 is its limited communication speed which is maxed out at 10 Mbaud. RS-485 is designed for a master/slave topology. In this system, the master polls each slave waits for the response, and then polls the next slave. This allows a deterministic behavior by avoiding collisions of data packets. Ethernet however has no built-in methods to avoid data packet collisions. In applications like process control or robot control, for us, deterministic behavior is mandatory while the speed of communication is usually more than high enough. Communicating at lower speeds also has the advantage of being more resilient to the noise present in industrial environments.


Author: Written by Mrs Auguest Yu from S4A INDUSTRIAL CO.,LIMITED


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  S4A-Security For All.S4A Industrial Co., Limited, Founded in 2010, We have been dedicating in access control production R&D and sales for 10year till now. With the belief that we do one thing well in a lifetime, our CEO has been in this industry for 15 years. During the past 10 years, our products have been exported to various countries and regions. And 90% of customers come from the recommendations of cooperative customers, and 80% of the turnover comes from cooperative customers in the past 10years.Your business is a plant, we are the gardener, our mission is to water and fertilize the plant, and make it become the towering tree. We attach great importance to the partner's appeal, customer's suggestions, and feedbacks. To strengthen Product quality awareness, client's service awareness. Our clients and S4A are on the same path walking for many years.       S4A's future would be even more brilliant, this is related to all of our staff's working sweat. When you join this team, you will feel an invisible power to drive walk forward. S4A mainly produces a series of security Door Access Control such as:Network Access Controller, Locker board, Electromagnetic lock, Standalone door Controller, Automatic door opener, etcOur team can manufacture products, sell products, and do after-sales.In the realm of access control, one company stands out for its unwavering commitment to providing security services for everyone. S4A, which stands for "Security for All," has been at the forefront of access control technology for the past 13 years. With its own state-of-the-art factory and a strong focus on research and development, S4A has continuously delivered cutting-edge access control machines with the latest functions. Their dedication to product quality, customer feedback, practicability, and cost performance sets them apart as a leader in the industry.Factory and R&D Expertise:S4A takes pride in its fully-equipped factory, where skilled engineers and technicians work tirelessly to develop and manufacture access control solutions that meet the highest standards. The company's investment in research and development has resulted in a steady stream of innovative products that cater to evolving security needs.By staying ahead of the curve, S4A ensures that their customers have access to the latest advancements in access control technology.Quality Assurance and Customer Feedback:At S4A, product quality is of paramount importance. The company adheres to rigorous quality control procedures throughout the manufacturing process to guarantee the reliability and durability of their access control machines. Each product undergoes comprehensive testing to ensure it meets industry standards and exceeds customer expectations. S4A also places great value on customer feedback, actively seeking input to continuously improve their products and services. By listening to their customers, S4A maintains a customer-centric approach and delivers solutions that address real-world security challenges.Practicability and Cost Performance:S4A understands that access control solutions must not only be technologically advanced but also practical and cost-effective. The company's emphasis on practicability means that their products are designed to be user-friendly, easily integrated into existing systems, and adaptable to various environments. S4A's access control machines are known for their intuitive interfaces, simple installation processes, and seamless compatibility with other security systems. Additionally, S4A strives to provide cost-effective solutions without compromising on quality. Their competitive pricing ensures that security is accessible to businesses and individuals of all sizes.With 13 years of industry experience, S4A has cemented its position as a leading provider of access control solutions. Through their dedication to "Security for All," the company has set a benchmark for excellence in product quality, customer satisfaction,practicability, and cost performance. S4A's in-house factory and research and development capabilities enable them to stay at the forefront of technological advancements in the field of access control. As the company continues to evolve and innovate, S4A remains committed to empowering individuals and organizations with the highest level of security, ensuring that everyone can enjoy the peace of mind that comes with a reliable and efficient access control system.We can create value for you!Quality takes great importance for a company's credibility, and buyer's every penny spend must worth it. That is our most basic principle. Our business mainly for wholesale, so we could offer large quantities at competitive prices. During the past 10 years, We work hard to create value for our customers, and with our help, customers have an increasing market share. 99% of the customer...<
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