What is a serial port server - application and operation

 Serial device server, what is it?

A serial device server is a device that allows devices connected usually to a computer via the RS232, RS422 or RS485 serial interface to be shared on the network. Serial device servers were created with the assumption that it should be possible to remotely connect to and control devices with a serial interface through the Ethernet LAN network or the Internet.

How does a serial device server work?

Thanks to appropriate software and connecting the server to the Ethernet network, we are able to collect data from devices via RS232 or RS485 and read it using an application. By configuring a serial device server, we can configure it as a client or as a hub server for client-server applications and TCP or UDP connections. A configured serial device server can operate in direct IP access mode, virtual COM port mode or client-server pair mode.

Serial device server - examples of applications

Serial device servers are used in many industrial sectors, enabling the integration of older devices with modern IT systems. In the energy sector, they are used for monitoring and controlling power grid infrastructure, including substations and measurement systems. Thanks to them, operators can remotely analyse operating parameters and quickly respond to failures.

In transport and logistics, serial device servers support the management of vehicle traffic, GPS systems and access control to facilities. Building automation also uses these solutions – they enable the integration of HVAC, lighting and security systems, which leads to optimisation of energy consumption and increased user comfort.

Fire alarm application: connect the serial device server to the RS232/485 serial port that contains fire alarms to quickly share alarm information to the cloud platform and notify personnel of the need to eliminate the threat.

Smart light sources of factories and mines: original industrial and industrial lighting devices for “Power control lamps”, which cannot be connected to devices and mechanical equipment, which causes energy waste. Network communication between serial and serial lighting ports servers can not only enable lighting control, but also functional functions of devices and equipment that affect costs caused by electrical devices.

Monitoring of municipal water supply: at present, the municipal water supply system is still subject to serial port network communication, which is only responsible for machine operations, with limited transmission distance and difficult system maintenance. A serial device server can monitor the status of water equipment in real time through TCP server mode.

Serial device server and supported protocols.

In the commercial environment, serial device servers are practically no longer used, having been replaced by newer solutions, however in the industrial environment they are still popular and widely used. The main influence on this is their reliability, ease of implementation and price. They are much cheaper than newer solutions. In industry, the most popular serial device server is a single-port multiport RS232, RS422, RS485 to Ethernet. Serial device servers from RS232 or RS485 to Bluetooth, ZigBee or WiFi are also often found. Systems and devices using a serial device server include scales, warehouse devices, laboratory devices, scanners, barcode readers, printers and energy meters.

The most important features of an industrial serial device server.

On the industrial automation market, we have a diverse offer of industrial serial device servers. This situation was forced by the multitude of devices and various protocols used in different fields of industry, but also by the changing conditions that may prevail, for example, in production halls. Therefore, a good industrial serial device server should easily operate in a temperature range from -40 °C to +85 °C. The power supply of the serial device server should allow it to be powered with current in the range of 9-48VDC. The ports on the serial port side should be brought out on DB9 connectors for RS232 and terminal for RS485, which will facilitate connecting devices on site. Additional surge protection and electrostatic protection is already standard in every industrial-class product.

The most important features of an industrial serial device server are:

• wide operating temperature and power supply range (9-48VDC - including telecommunications voltage)
• protection from IP40
• operation in Windows and Linux operating systems
• support for popular protocols such as TCP, UDP, ARP, ICMP, DHCP
• support for 10/100Mbps Ethernet networks (including PoE)
• long warranty period confirming product reliability
• MTBF at the level of 20 years (mean time between failure - average fault-free operating time of the device)
• confirmed by appropriate certificates compliance with industrial standards such as EMI, EMS, IEC 60068, FCC, CE, RoHS

If you need help choosing the right serial device server, contact a specialist who will help you choose a product suitable for your project needs.

How to choose the right serial device server?

When choosing a serial device server, it is worth paying attention to several key aspects. First of all, the number and type of supported ports should be determined, such as RS232, RS422 or RS485, depending on the requirements of the devices that are to be connected. An important factor is also the maximum data transmission speed, which should correspond to the specification of the connected systems.

Another important element is management and security functions, including support for transmission encryption or user authorisation mechanisms. In industrial applications, it is also worth paying attention to resistance to difficult environmental conditions, such as high temperature, humidity or electromagnetic interference. Choosing the right serial device server will ensure stable operation and compatibility with the existing infrastructure.

Serial device server - what are the benefits of its use?

The implementation of serial device servers in communication systems brings many benefits. First of all, it allows centralisation of the management of serial devices, eliminating the need for physical access to each of them. Thanks to the conversion of serial signals into network protocols, it is possible to use the existing Ethernet infrastructure to transmit data, which significantly reduces costs and simplifies system expansion.

Another advantage is the possibility of remote monitoring and configuration of devices, which increases the efficiency of operational processes and reduces downtime. In addition, modern serial device servers offer advanced security mechanisms, such as VPN, SSL/TLS encryption and IP address filtering, ensuring a high level of protection for transmitted data.

Serial device server - examples of applications in various industries

Serial device servers are used in many industrial sectors, enabling the integration of older devices with modern IT systems. In the energy sector, they are used for monitoring and controlling power grid infrastructure, including substations and measurement systems. Thanks to them, operators can remotely analyse operating parameters and quickly respond to failures.

In transport and logistics, serial device servers support the management of vehicle traffic, GPS systems and access control to facilities. Building automation also uses these solutions – they enable the integration of HVAC, lighting and security systems, which leads to optimisation of energy consumption and increased user comfort.