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MOXA - TCF-142-M-ST (Our ITEM #: 286842)
RS-232/422/485 to Fiber Optic Multi mode Converter with ST Connecters
Unit Price MSRP: $219.00
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 Overview   Accessories   DataSheet 
Moxa PD Frame

The TCF-142 Series converter is equipped with a multiple interface circuit that can handle RS-232, or RS-422/485 serial interfaces and multi-mode or single-mode fiber. TCF-142 converters are used to extend serial transmission distance up to 2 km (TCF-142-M multi-mode fiber) or up to 20 km (TCF-142-S single-mode fiber). Note that the RS-232 and RS-422/485 interfaces cannot be used on the same TCF-142 at the same time to convert to fiber.

Why Convert Serial to Fiber?

Fiber communications not only extends the communication distance, but is also beneficial in many other ways, such as:

  • Immunity from electrical interference
    Optical fiber is not effected by electromagnetic interference or radio frequency interference, provides a clean communication path, and is immune from cross-talk.
  • Insulation
    Optical fiber is an insulator; the glass fiber eliminates the need for using an electric current as the data transmission medium.
  • Security
    Optical fiber cannot be tapped by conventional electronic means, and is very difficult to tap into optically. Furthermore, radio and satellite communication signals can be easily captured for decoding.
  • Reliability and Maintenance
    Optical fiber is immune from adverse temperature and moisture conditions, does not corrode or lose its signal, and is not affected by short circuits, power surges, or static electricity.

DIP Switch Selectable Terminator

For many products of this type, the termination resistor is set by a jumper located inside the product's casing, so that the user must open the casing to disable or change the resistor's strength. Moxa offers a better solution. TCF-142's terminator is set with a DIP Switch located on the outside of the converter's casing.

Auto Baud Rate Detection

TCF-142 incorporates a method for automatically detecting the serial signal's baud rate by hardware. This is an extremely convenient feature for the user. Even if a device's baud rate changes, the signal will still be transmitted through the converter without any problem.

Ring Operation

To allow one serial device to communicate with multiple devices connected to a fiber ring, you should configure TCF-142 for "ring mode" by setting DIP switch "SW4" to the "On" position. The Tx port of a particular TCF-142 unit connects to the neighboring converter's Rx port to form the ring. Note that when one node transmits a signal, the signal travels around the ring until it returns back to the transmitting unit, which then blocks the signal. Users should ensure that the total fiber ring length is less than 100 km.

NOTE: Only TCF-142-M v2.1 and TCF-142-S v2.3 (and later versions) support ring mode.

Automatic Data Direction Control (ADDC™)

ADDC™ is a MOXA leading technology that uses a clever hardware solution to take care of the RS-485 data direction control problem. The TCF-142 Series converter uses embedded ADDC™ technology, a hardware data flow solution, to automatically sense and control data direction, making the hand shaking signal method unnecessary.

  • “Ring” or “Point to Point” transmission
  • Convert RS-232/422/485 signal to fiber
    • ST Single-mode fiber with TCF-142-S
    • ST Multi-mode fiber with TCF-142-M
  • Extend RS-232/422/485 transmission distance
    • 20 km with Single mode—TCF-142-S
    • 2 km with Multi-mode—TCF-142-M
  • Plug & Play
  • Compact size
  • Decrease signal interference
  • Supports baud rate up to 921.6 Kbps
  • Extended operating temperature from -40 to 75°C
Serial Communication
RS-232 Signal
Supports TxD, RxD, GND
RS-422 Signal
Supports TxD+/-, RxD+/-, GND
4-wire RS-485 Signal
Supports TxD+/-, RxD+/-, GND
2-wire RS-485 Signal
Supports Data+, Data-, GND
Baud Rate
300 bps to 921.6 Kbps
Surge protection
Fiber Communication
Connector type
TCF-142-S: Single mode fiber for 20 km
TCF-142-M: Multi mode fiber for 2 km
Support Cable
TCF-142-S: 8.3/125, 8.7/125, 9/125, or 10/125 µm
TCF-142-M: 50/125, 62.5/125, or 100/140 µm
TCF-142-S: 1310 nm
TCF-142-M: 820 nm
Min. TX Output
TCF-142-S: -9 dBm
TCF-142-M: -16 dBm
Max. TX Output
TCF-142-S: -6 dBm
TCF-142-M: -7 dBm
Connector Type
Point-to-Point Transmission
half or full-duplex
Ring Transmission
half duplex, fiber ring
Operating Temperature
0 to 60°C (32 to 142°F)
-40 to 75°C (-40 to 167°F), for -T models
Storage Temperature
-40 to 85°C (-40 to 185°F)
5 to 95% RH
Power Consumption
Input Power Voltage
12 to 48 VDC
Power Line Protection
1 KV Burst (EFT), EN61000-4-4
1 KV Surge, EN61000-4-5
Reverse Power Protection
Protects against V+/V- reversal
Over Current Protection
Protects against 2 signals shorted together: 1.1A
Power Consumption
TCF-142-M: 70 mA at 12 VDC
TCF-142-S: 145 mA at 12 VDC
Dimensions (W x D x H)
67 x 100 x 22 mm (without ears)
90 x 100 x 22 mm (including ears)
Aluminum (1 mm)
Regulatory Approvals
Part 15 sub Class B
EN55022 1998, Class B
EN61000-4-2 (ESD), Criteria A, Level 2
EN61000-4-3 (RS), Criteria A, Level 2
EN61000-4-4 (EFT), Criteria A, Level 2
EN61000-4-5 (Surge), Criteria A, Level 3
EN61000-4-6 (CS), Criteria A, Level 2
EN61000-4-11(DIPS), Criteria A, Level2
IEC 60068-2-32
Ordering Information
RS-232/422/485 to Multi-mode Fiber Optical Converter
RS-232/422/485 to Single-mode Fiber Optical Converter
Extended Temperature Model: RS-232/422/485 to Multi-mode Fiber Optical Converter, fiber ring, -40 to 75°C
Extended Temperature Model: RS-232/422/485 to Single-mode Fiber Optical Converter, fiber ring, -40 to 75°C
All items include:
TCF-142 Series Converter, Manual
Optional Accesories
DIN-Rail Mounting Kit (35 mm)
Power Adaptor and DIN-Rail Power Supplies (link to the Accessories section for more details)


Power Requirements
Power Consumption 140 mA @ 12 V
Input Voltage 12 to 48 VDC
Voltage Reversal Protection Protects against V+/V- reversal
Over Current Protection 1.1 A (protects against two signals shorted together)
Power Line Protection 2 KV Burst (EFT), EN61000-4-4 
2 KV Surge, EN61000-4-5
Optical Fiber Side
Wavelength Single-mode: 1310 nm 
Multi-mode: 850 nm
Transmission Distance Single-mode: 40 km 
Multi-mode: 5 km
Rx Sensitivity Single-mode: -25 dBm 
Multi-mode: -20 dBm
Fiber Connector SC or ST
Tx Output Single-mode: > -5 dBm 
Multi-mode: > -5 dBm
Cable Requirements Single-mode: 8.3/125, 8.7/125, 9/125, or 10/125 μm 
Multi-mode: 50/125, 62.5/125, or 100/140 μm
Point-to-Point Transmission Half-duplex or full-duplex
Ring Transmission Half-duplex
Environmental Limits
Operating Temperature Standard Models: 0 to 60°C (32 to 140°F) 
Wide Temp. Models: -40 to 75°C (-40 to 167°F)
Storage Temperature -40 to 75°C (-40 to 167°F)
Ambient Relative Humidity 5 to 95% (non-condensing)
MTBF (mean time between failures)
Time 780,480 hrs
Database Telcordia (Bellcore), GB
RS-232/422/485 Side
Connector Terminal Block
ESD Protection 15 KV for all signals
RS-422 Signals TxD+, TxD-, RxD+, RxD-, GND
RS-485-4w Signals TxD+, TxD-, RxD+, RxD-, GND
RS-232 Signals Tx, Rx, GND
RS-485-2w Signals Data+, Data-, GND
Baudrate 50 bps to 921.6 Kbps
Physical Characteristics
Weight 320 g
Dimensions Without ears: 67 x 100 x 22 mm (2.64 x 3.94 x 0.87 in) 
With ears: 90 x 100 x 22 mm (3.54 x 3.94 x 0.87 in)
Housing Aluminum (1 mm)
Standards and Certifications
EMI FCC Part 15 Subpart B Class B, EN 55022 Class B
Safety UL 60950-1
EMS EN 61000-4-2 (ESD) Level 3,
EN 61000-4-3 (RS) Level 2,
EN 61000-4-4 (EFT) Level 2,
EN 61000-4-5 (Surge) Level 2,
EN 61000-4-6 (CS) Level 2,
EN 61000-4-8 (SFMF) Level 1
Green Product RoHS, CRoHS, WEEE
Warranty Period 5 years
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Manufacturer Warranty Policy


Moxa products are warranted to be free from manufacturing defects in materials and workmanship starting from the date of delivery. The actual warranty period of the product(s) depends on the product category.

Warranty Periods

* The 3-year warranty period for Embedded x86 Box Computers is effective for products shipped after Jan. 1, 2010. A 5-year warranty still applies to products shipped before 2010.

* For products containing storage devices (hard drives, flash drives, etc.), back up your data before sending the products for repair. Moxa is not responsible for any loss of data. Please ensure the use of properly licensed software with our systems. Moxa does not condone the use of pirated software and will not service systems using such software. Moxa will not be held legally responsible for products shipped with unlicensed software installed by the user.

* If the customer opens the computer to install an HDD without making any modifications to the unit, the warranty will remain valid.

Product warranties remain valid provided the product was properly installed and used. Defects, malfunctions, or failures of the warranted product caused by damage resulting from acts of God (such as floods, fire, etc.), environmental and atmospheric disturbances, other external forces such as power line disturbances, host computer malfunction, plugging the board in under power, or incorrect cabling, and damage caused by misuse, abuse, and unauthorized alteration or repair, are not warranted. A product will not be warranted in the following situations:

This warranty is limited to the repair and/or replacement, at Moxa's sole discretion, of the defective product during its warranty period. Moxa will replace any product found to be defective within the first three months of purchase provided said product was properly installed and used. The customer must obtain a Return Merchandise Authorization (RMA) number prior to returning the defective product to Moxa for service.

The customer agrees to insure the product or assume the risk of loss or damage during transit, to prepay shipping charges, and to use the original shipping container or equivalent. Customers may either seek assistance from the original dealer, or from the closest Moxa Service Office. Repaired or replaced products are warranted for ninety (90) days from the date of repair or replacement, or for the remainder of the original product's warranty period, whichever is longer. For large order projects, customers may purchase an extended maintenance contract. Such products may have a shorter chipset life cycle, or some parts may have a limited warranty from the original supplier of the parts. Please contact Moxa's sales department if you would like to extend the maintenance period of a Moxa product.

Limitation of Liability

The provisions of the warranty are in lieu of any other warranty, whether expressed or implied, written or oral. Moxa's liability arising out of the manufacture, sale, or supplying of the product and its use, whether based on warranty, contract, negligence, product liability, or otherwise, shall not exceed the original cost of the product. In no event shall Moxa be liable for unintended or consequential damages, including, but not limited to, a loss of profits or use damages arising out of the manufacture, sale, or supplying of the product.

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