How to Choose a Cost-effective Ethernet to RS485 Converter?

As we all know, choosing a high-quality and long-term stable Ethernet to RS485 Converter can greatly reduce the cost of construction and maintenance. So, how to choose a cost-effective Ethernet to RS485 Converter?

Try to buy 32 CPU 10/100m products, because 8 or only support 10 M MCU products are prone to occur in large networks, or network congestion loss! Choose ARM 32 and ask the seller whether it is an industrial or civilian CPU. The choice is certainly more stable and reliable than the industrial grade commercial grade. By and large, American industrial-grade chips are now leading the market.

Note that the common serial port parameters of the "setting software" provided by the device manufacturer must be set to (such as data bit, stop bit, parity, baud rate, flow control, etc.) in many cases. Otherwise, you can use many software manufacturers to even set the baud rate, resulting in normal communication.

We will use a very effective method to test and determine the communication problem of the Ethernet to RS485 Converter: On the 9600, the Ethernet to RS485 Converter is reliable only when it does not lose a byte when it sends at least several hundred K of stable data communication at a time!

Many users think that the hardware is similar, but in fact it is not. Although chips are imported, as raw materials for electronic products, the supply of chips is very important. Imported chips, batch new, refurbished, etc. In order to reduce costs, many black-hearted manufacturers choose new or refurbished ICs at will, so they may not fail in a short time, but they are certainly unstable for a long time!

Choose professional manufacturers to buy Ethernet to RS485 Converter. Now there are many brands, and the price level is uneven. Technical service is an important part of electronic product sales. Professional manufacturers can not only help customers solve complex network problems, but also help customers solve problems such as website construction! Shenzhen high-tech, leading the industry, has accumulated decades of experience in the industry!

At present, many manufacturers in the market are using RS485/422 to DB9 adapter board products. The adapter board is prone to poor contact, so try to choose products with terminals directly.

The Ethernet to RS485 Converter is purchased mainly because the RS485 serial port can be connected in parallel with more terminals, which is suitable for more application scenarios of half-duplex. When the field terminal equipment is mostly RS232, it is still necessary to consider that RS232 to Ethernet Converter is more convenient to use, which is the symbol of PUSR design capability. N5X0 series has both RS485/RS232 serial ports, and products can be selected according to the number of serial ports:

N510(1port serial to ethernet converter);

N520(2 port serial to ethernet converter);

N540(4 port serial to ethernet converter);

N580(8 port serial to ethernet converter)

Professional manufacturers often have many years of product experience, product design considerations are more comprehensive, such as products will adopt PE (anti-electromagnetic interference use) design, wide voltage design (voltage instability has a protective effect), lightning protection design and so on.

About the difference between industrial and commercial grade:

As we all know, electronic products are generally divided into commercial grade, industrial grade and military grade according to their working temperature and reliability. The temperature range is 0℃ ~ 70℃ for commercial grade and -40℃ ~ 85℃ for industrial grade. Compared with commercial grade industrial products, they are used in worse working environments and require higher reliability, so the manufacturing process that needs to be tested is more complex and of course more expensive. If it is an ordinary commercial single-chip microcomputer, the use of ultra-large size range of IC.

Some of the ICs may not work, or may not work properly. The selection of industrial products must pay attention to the temperature of the product series IC, especially the performance parameters of the CPU.

About the difference between 8-bit microcontroller and 32-bit ARM:

Ethernet to RS485 Converter CPU, as the most important component, generally uses 8-bit or 32-bit ARM microcontrollers, and now many manufacturers claim that their products are 32-bit ARM CPUs.

Attention should be paid when purchasing:

Single-chip microcomputer 1.8 only supports 10 M communication, and ARM 32-bit can support 10 M/100 M communication (adaptive); 8 or microcontroller products that only support 10 M are prone to packet loss in large networks or network congestion.

From the appearance, the pins of the MCU are generally relatively small, and the spacing is relatively thin; while the ARM pins are more, and the spacing is relatively close (about 100 pins).

ARM is divided into industrial and commercial grades. Most of the Ethernet to RS485 converters on the market have chosen the civilian ARM level, such as Samsung ARM. Because of their low price, most of these ARMs are used in consumer electronics products, and their stability and reliability are far less than those of industrial ARMs.