Dry contact Fiber Multiplexer 4 channel unidirectional Optical Fiber Modem Converter

This dry contact fiber multiplexer is designed for stable and secure dry contact signal transmission in demanding industrial environments. It supports up to 4-channel unidirectional or 2-channel bidirectional dry contact communication over optical fiber, helping eliminate electromagnetic interference and improve transmission reliability.

Industrial-grade protection, the device features surge protection, redundant dual power inputs, fanless cooling, and wide temperature operation from -40°C to +85°C. The compact rail-mount design allows easy installation inside industrial cabinets, automation systems, traffic control equipment, and power monitoring systems.

The dry contact over fiber multiplexer supports SC, FC, ST or SFP slot optical interfaces and transmission distances up to 100km, which provides flexible deployment for industrial communication networks.

Dry contact Fiber Multiplexer  Features

• It can support unidirectional 4-channel dry contact and bidirectional 2-channel dry contact; Dry contact type supports dry node and wet node;
• The switching state of the dry contact is stable when it is turned on or the optical fiber is not connected, and there will be no disorderly action state;
• The dry contact input interface has its own filter to filter out the interference pulse and ensure the stable output of the dry contact signal at the output terminal;
• It is possible to set the normally open and normally closed states of each switch output when the optical fiber is not connected;
• Dry contact interface anti-radar to IEC61000-4-5 (8/20μS) differential mode: 6KV, impedance (2Ω); common mode: 6KV, impedance (2Ω) standard;
• Support a wide range of 9-55V AC and DC power input;
• Support internal isolation, redundant dual power input;
• The power supply supports overload protection and anti-reverse connection protection;
• Comply with industrial level 4 electromagnetic compatibility requirements;
• Super lightning protection function: lightning protection, anti-inductive high voltage, anti-surge, etc.;
• No fan for efficient heat dissipation, reducing repair time;
• Anodized aluminum alloy shell, IP40 protection level, can withstand the test of harsh environment;
• Rail or wall-mounted installation;
• Wide temperature type: working temperature -40℃~ +85℃;
• All models have passed 100% oven test;

Optical Fiber Modem Parameter

• Industrial Fiber Mux Fiber  

Optical port：1

Optical Fiber：Single/Dual fiber

Fiber interface：SC/FC/ST/LC(SFP) Optional

Wavelength：850nm/1310nm Multimode；1310nm/1550nm Single mode

Relay-free transmission distance: 0~80Km

Typical transmit power: single mode 100uw — 0.93mw

•  Dry contact to Fiber Converter Interface

Output interface type:

Dry contact: signal relay dry contact output;

Pulse amount (wet contact):

Optical MOS relay output, 0-VCC (VCC is the power supply voltage of the machine)

Response time dry contact output: <1.2ms; wet contact output <0.6ms

Switch signal dry contact output 30VDC/0.5A; wet contact output: 245VDC/0.12A

Maximum switching frequency 50HZ

Output surge protection: dry contact output: none; wet contact output: TVS+solid discharge tube protection

•  Optical Fiber Modem Environmental

Working temperature: -40℃—+85℃

Storage temperature: -40℃—+85℃

Working humidity: 0%—95% (non-condensing)

MTBF: >100,000 hours

Specification