The Moxa TCC-120 is an RS-422/485 converter/repeater specifically developed for extending transmission distances in industrial applications. The device serves signal amplification and regeneration to increase the range of serial data transmissions over RS-422 or RS-485 protocols. It is designed for use in critical industrial environments where reliable and stable communication between devices is required. The robust construction with DIN rail mounting enables easy integration into existing control and automation systems.

Applications
The TCC-120 is suitable for applications where the maximum range of the RS-422/485 connection is exceeded, for example in manufacturing automation, power supply, or process control. It can function as a repeater to amplify signals or as a converter between RS-422 and RS-485 to connect different devices. Its use in industrial environments with high requirements for reliability and EMI immunity is intended.

Functions and Equipment in Detail
The device features a terminal block for simple and secure wiring of the serial interfaces. Power supply is provided via a separate terminal block for external power input, enabling flexible installation. An integrated DIP switch allows setting an internal termination resistor of 120 Ohm, which may be required for signal stabilization in RS-485 networks. This function is particularly useful when the device is installed at the end of a bus line.

Technology Explained Simply
The TCC-120 amplifies serial signals to extend the transmission distance. In RS-485 networks, which are often operated over long distances, the signal can be weakened by line losses and interference. The repeater regenerates the signal, ensuring clear, error-free data transmission. Support for conversion between RS-422 and RS-485 expands compatibility with various devices using different serial interfaces. The DIN rail mounting enables quick and secure installation in enclosures.

Compatibility and Accessories
The TCC-120 is compatible with RS-422 and RS-485 networks. It can be used in existing systems as a signal amplifier or as an interface converter. Use with other Moxa products, such as industrial network devices or modems, is possible as long as the serial protocols match.

Mounting and Installation
Mounting is done either on a DIN rail or on a wall, with the devices equipped with integrated mounting elements. Wiring is performed via the terminal block, ensuring a secure and mechanically stable connection. Power supply is connected via the separate terminal block, achieving a clear separation between data and power supply lines.

Advantages in Operation
The TCC-120 provides reliable signal amplification, increasing the range of RS-422/485 networks without compromising data integrity. Simple installation and maintenance via the terminal block and DIN rail mounting reduce installation effort. The integrated function to set the termination resistor via the DIP switch allows flexible adaptation to the respective network topology. The device is designed for industrial environments where high demands on stability and reliability exist.