General
Wavelength	1310 nm
Range	40 km
Link budget	20 dB
Dispersion penalty	1 dB
Input voltage	12–48 VDC
Air humidity	5–95 % (nicht kondensierend)
MTBF	780.480 Stunden (Telcordia)

The TCF-142 from Moxa is an industrial media converter that enables serial data transmission over fiber optic links. It converts signals of the RS-232, RS-422, and RS-485 standards into light waves and is designed for use in demanding industrial environments where reliable and interference-free communication over long distances is required. The device supports both point-to-point and ring topologies, with a maximum ring length of 100 km. The conversion is performed via single-mode fiber optic cable with a wavelength of 1310 nm and a maximum reach of 40 km. The serial interface is configurable and offers two connectors. The baud rate can be automatically detected and ranges from 50 bps to 921.6 kbps, including non-standard rates. Data flow control is achieved via ADDC (Automatic Direction Control), enabling communication in RS-485 networks without additional control units. Isolation against electrical and chemical interference reduces the impact of EMI/EMC and enhances signal integrity.

Applications

The TCF-142 is designed for industrial applications requiring stable serial data transmission over long distances. These include, for example, automation systems in manufacturing, building automation, power supply networks, or traffic control systems. The support for ring topologies makes it particularly suitable for redundant networks, where communication interruptions should be minimized. The high reach of up to 40 km over single-mode fiber optic cable enables the connection of sites that are far apart, without requiring additional amplifiers or repeaters.

Functions and Features in Detail

The device features a robust metal housing construction with an IP30 protection rating, protecting against mechanical damage and limited ingress of foreign objects. The serial interface offers selectable termination resistors (N/A, 120 Ohm, 120 kOhm) as well as pull-up/pull-down resistors (1 kOhm / 150 kOhm) to optimize signal quality in various networks. The fiber optic interface operates with a TX power of 0 to -5 dBm and an RX sensitivity threshold of -25 dBm for single-mode. The link budget is 20 dB, ensuring sufficient signal margin for the intended reach. The dispersion penalty is 1 dB, minimizing signal distortion caused by the fiber optic cable.

Technology Explained Simply

The media converter transforms serial data transmitted over copper cables into light signals sent over fiber optic cables. This enables transmission over longer distances without signal loss or interference, which can occur with copper cables due to electromagnetic interference. The automatic baud rate detection allows flexible integration into existing systems without requiring manual setting of the transmission rate. The ADDC function automatically controls data direction in RS-485 networks, eliminating the need for additional control logic. The isolation between the serial and optical parts protects against voltage surges and electrical interference caused by different ground potentials or industrial machinery.

Compatibility and Accessories

The TCF-142 is compatible with various serial interface standards (RS-232, RS-422, RS-485) and can be integrated into existing industrial communication networks. The support for ring topologies enables the connection of multiple devices in a closed loop, with a maximum ring length of 100 km. The devices can be used in combination with other TCF-142 models or compatible media converters to build complex networks. The use of single-mode fiber optic cable enables high reach and is suitable for applications where the distance between endpoints is large.

Mounting and Installation

The device is designed for wall mounting and features mounting holes that allow secure installation. Dimensions are 90 × 100 × 22 mm (with mounting holes) or 67 × 100 × 22 mm (without holes). Power supply is via a terminal block with an input voltage of 12 to 48 VDC. Power consumption ranges from 70 to 140 mA. The device includes reverse polarity protection and overcurrent protection to prevent damage from incorrect connection or current overload. Installation requires no special tools, and connection points are clearly marked.

Operational Advantages

The TCF-142 offers high operational reliability through the use of fiber optic cable, which is immune to electromagnetic interference. The automatic baud rate detection and ADDC function reduce configuration effort and increase flexibility when integrating into existing systems. The high reach of 40 km over single-mode fiber optic cable enables the connection of sites located far apart. The operating temperature range is from -40 to 75 °C, enabling use in extreme environments. Certifications according to EN 55032/35, CISPR 32, FCC Part 15B Class A, IEC 61000-4-2 to 4-8, UL 60950-1, and IEC 60068-2-6 guarantee compliance with relevant standards for electromagnetic compatibility, safety, and mechanical durability. The MTBF is 780,480 hours (Telcordia), highlighting the high reliability and long service life of the device. Storage temperature ranges from -40 to 85 °C, and humidity is 5–95 % (non-condensing). The delivery includes the TCF-142 media converter, a rubber stand foot, a quick start guide, and a warranty card.