Connection and Communication with Serial Devices – A Guide to Converters, Servers, and Isolators

1. USB to RS232/RS485/422 Converters

USB-to-serial converters are essential for connecting modern computers (without serial ports) to legacy equipment. These converters enable communication with devices such as PLCs, instruments, and industrial machines.

Applications:

• Industrial automation

• Measurement instruments

• POS systems

• Communication equipment

Features and Benefits:

• Plug-and-play via USB

• Supports RS232, RS485, or RS422 (or combinations)

• Many models offer galvanic isolation

• Compatible with Windows and Linux

• Some models have DIP switches for easy protocol configuration

View DANBIT’s range of USB serial converters

2. Serial Port Servers (Serial Device Servers)

A serial port server connects serial devices to a TCP/IP network, enabling centralized remote access and control — ideal for integration into SCADA systems.

Applications:

• Remote access to production equipment

• Network monitoring of measuring instruments

• Integrating RS232/485 devices into IP systems

Features and Benefits:

• 1 to 16 serial ports (RS232/RS485/RS422)

• Web-based configuration

• Supports Virtual COM, TCP Server/Client, UDP

• Galvanic isolation and surge protection on selected models

• Industrial-grade durability

View DANBIT’s range of serial port servers

3. Extenders, Isolators, and Repeaters for Serial Communication

These devices ensure reliable serial communication over long distances or where electrical isolation is needed to protect sensitive equipment.

Applications:

• Long cable runs in factories

• Noise-sensitive environments

• Ground potential differences between devices

Features and Benefits:

• Extends RS232/RS485/RS422 signals over long distances

• Optical or galvanic isolation against voltage spikes

• Signal boosting for better integrity

• Can be combined with converters and port servers

View DANBIT’s range of extenders and isolators

Summary – Which Device Do You Need?

With over 50 years of experience, DANBIT is your trusted partner for industrial serial communication.
Need help choosing the right product? Contact our technical experts!