Features and Benefits

  • Extend RS-232/422/485 transmission up to:
  • 40 km with single mode
  • 5 km with multi-mode
  • 1K or 150K ohm adjustable pull high/low resistor
  • “Ring” and ”Point-to-Point” transmission supported


The TCF-142-RM series of serial-to-fiber converters are slide-in modules that work with the TRC-190 chassis. The modules convert from the RS-232, RS-422, or RS-485 signal to a fiber optic signal.

The TCF-142-RM series can automatically detect the serial baudrate. This is an extremely convenient feature. Even if a device’s baudrate is changed, the signal will still be transmitted through the media converter without any problem.

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Optical Fiber Side
Fiber Connector SC or ST
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

Transmission Distance

Single-mode: 40 km

Multi-mode: 5 km


Single-mode: 1310 nm

Multi-mode: 850 nm

Tx Output

Single-mode: > -5 dBm

Multi-mode: > -5 dBm

Rx Sensitivity

Single-mode: -25 dBm

Multi-mode: -20 dBm

Point-to-Point Transmission Half-duplex or full-duplex
Ring Transmission Half-duplex
RS-232/422/485 Side
Connector DB9
RS-232 Signals TxD, RxD, GND
RS-422 Signals TxD+, TxD-, RxD+, RxD-, GND
RS-485-4w Signals TxD+, TxD-, RxD+, RxD-, GND
RS-485-2w Signals Data+, Data-, GND
Baudrate 50 bps to 921.6 Kbps
ESD Protection 15 KV for all signals
Physical Characteristics
Dimensions 86.8 x 136.5 x 21 mm (3.42 x 5.37 x 0.83 in)
Environmental Limits
Operating Temperature 0 to 60°C (32 to 140°F)
Storage Temperature -20 to 75°C (-4 to 158°F)
Ambient Relative Humidity 5 to 95% (non-condensing)
Power Requirements
Input Voltage 12 VDC
Power Consumption 150 mA @ 12 V
Standards and Certifications
EMI FCC Part 15 Subpart B Class A

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 (PFMF) Level 3

Freefall IEC 60068-2-32
Green Product RoHS, CRoHS, WEEE
MTBF (mean time between failures)
Time 514,926 hrs
Database Telcordia (Bellcore), GB
Warranty Period 5 years
Details See