General
Number of ports	2

The Moxa TCC-120I is an industrial RS-422/485 signal amplifier and protocol converter, developed for extending and stabilizing serial communication links in demanding environments. The device features a robust metal construction and is equipped with optical isolation of 2 kV, protecting it against electrical interference and voltage surges. It is particularly suitable for applications requiring reliable data transmission over long distances, such as in automation technology, manufacturing, or building automation.

Applications

The TCC-120I is used in industrial networks where serial interfaces such as RS-422 or RS-485 are employed. It serves as a signal amplifier to increase data transmission range, and as a protocol converter to connect different devices. Support for two- and four-wire RS-485 as well as RS-422 makes it flexible for use in various system configurations. The automatic data direction control (ADDC) enables bidirectional communication without manual settings.

Functions and Features in Detail

The device features two serial ports with terminal block connections, supporting both RS-422 and RS-485. The baud rate can be set between 50 bps and 921.6 kbps, including non-standard transmission rates. Termination resistors can be configured via DIP switches – options include 120 Ω, 120 kΩ, or disabled – to optimize signal quality in long cables. Additionally, integrated pull-high and pull-low resistors of 1 kΩ and 150 kΩ respectively ensure signal stability.

Technology Explained Simply

The optical isolation of 2 kV protects the device and connected equipment from transient voltage spikes and ground loops. This is especially important in industrial environments with strong electromagnetic interference. Power supply is via a terminal block with an input voltage of 12 to 48 VDC. Power consumption is 180 mA at 12 VDC. An integrated overcurrent protection safeguards the device against power supply faults.

Compatibility and Accessories

The TCC-120I is compatible with a wide range of industrial devices using RS-422 or RS-485 interfaces. Mounting is either on a DIN rail (with included kit) or on the wall. The mechanical design is compact, with dimensions of 67 × 100.4 × 22 mm and a weight of 148 g. The enclosure class IP30 protects against finger contact and larger solid objects, but is not waterproof.

Installation and Mounting

Installation is performed using the included DIN rail kit or wall mounting. Connections are made via terminal blocks, ensuring secure and mechanically stable connections. Configuration of termination resistors and data direction is done via DIP switches directly accessible on the device. The quick start guide included in the package supports setup.

Operational Advantages

The TCC-120I offers high operational reliability due to optical isolation and integrated overcurrent protection. The flexible configuration of termination and support for various serial protocols increases adaptability to existing systems. The operating temperature range of -20 to 60 °C allows use in a wide range of environments. Certifications according to CISPR 32, FCC Part 15B Class A, IEC 61000-4-2 to 4-8, and UL 60950-1 ensure compliance with international standards for electromagnetic compatibility and safety. The MTBF is 1,949,025 hours according to Telcordia standard, indicating high reliability.

Scope of Delivery

The device is delivered with the following components: 1x TCC-120I, 1x terminal block-to-power supply adapter, 1x DIN rail kit, 1x rubber stand, 1x quick start guide, 1x warranty card.