Moxa  Mfg Mini-Store

RS-232/422/485 to Fiber Optic Multi mode Converter with ST Connecters

Product Page @ Moxa Site MOXA Major Lines
Mfg Part Number:  TCF-142-M-ST  
Image may not reflect the actual item.
Price: $260.81
In Stock: 64
No Sales Tax except these states
, PO and Wire.
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
Details See
Stock: 4343
[1] [True] [Yes] [No] [No] has a Shopper Approved rating of 4.6/5 based on 29339 ratings and reviews.