Optical multiplexer of two RS232/422/485 serial interfaces

RSMUX3-FO is a multiplexer of two RS232/422/485 data streams into fiber optic. Multiplexer allows connection of RS232/422/485 serial interfaces over fiber links with the maximum distance of 100km and provides complete electromagnetic isolation between devices and resistance to disturbances occurring along transmission path. Depending on the specific versions, device can be connected using multi-mode or single-mode fiber. WDM and SFP versions are also available.

  • Multiplexer of two RS232/422/485 interfaces over fiber link
  • Configurable serial connection: RS232, RS422,RS485
  • Protocol transparent, up to 2Mbit/s (RS485) or230,4Kbit/s (RS232) transmission speed
  • Configuration through DIP-SWITCHES
  • One or two optical interfaces, up to 100 km transmission distance
  • Available configurations: POINT-POINT, RING,BUS
  • 110-260VDC and 100-240VAC power supply
  • NC/NO alarm output

RSMUX3-FO provides fully transparent transmission path for RS channels. Each serial interface is sampled with a frequency of 20 MHz, which allows on data throughput of the RS up to 230,4 kbit/s for RS-232 or up to 2 Mbit/s for RS-485/RS-422 with +/-60ns pulse time distortion. The delay between two RSMUX3-devices for RS232 is 1,6us plus 0,4us times distance in meters, for RS-485 is 0,6us plus 0,4us times distance in meters. RS485 ports can be set up for 2-wire or 4-wire. Depending on the version of the device, multiplexer can work in point to point (with optical path protection), bus and ring topologies (possibility to build ring topologies with up to 64 devices). Serial interfaces can be configured through DIP switches.

We can use pair of RSMUX3-FO to realize interface conversion from RS-232 to RS485 or RS-4222.

Devices with single or double optical interfaces can work in ring topology. In case of single optical interface, topology gives us possibility to communicate with all devices, but don't guarantee connection in case of failure. Topology built with devices having double optical interfaces ensures proper communication even if one of the optical connection or device is broken.

RSMUX3-FO is available in industrial version with extended temperature range designed for operation in harsh environment. Device can be mounted directly on the DIN rail.

Example markings:

RSMUX3-FO-S-T-C - RS fiber opitc multiplexer, with 1310nm SM/MM transceiver, 20km length with SM optical fiber

RSMUX3-FO-WM-3-P-T-C - RS fiber optic multiplexer, with one WDM 1310/1550nm interface, and second 1550/1310nm interface, and up to 40km length with SM optical fiber

Note! Transceiver type field is used only in the case of WDM interfaces. When choosing SFP interface must be selected port type and range by selecting the optical SFP transceiver.

Specification Designation Local Interface Line Interface

Basic work mode is connection of pairs of devices. Example is shown on the picture below.


Point-to-point links with and without optical path protection:

Example ring topology, built with devices having single fiber optic interface.

Example ring topology, built with devices having double fiber interfaces.

Example bus topology.

  • Number of RS 232/422/485 interfaces- 2
  • Transmission speed – 0 – 230400 bits/s RS-232
  • Transmission speed – 0 – 2 Mbit/s RS-485
RS serial interfaces
  • Two RS-232/422/485 interfaces
  • Screw connection
Optical ports
  • One or two optical interfaces
  • SM, MM, WDM, 1310nm, 1550nm
  • Fiber type 9/125um, 62,5 / 125um
  • SC/PC connector
  • Ranges depending on the type of optical port 15km, 50km, 120km (1550nm), 20km WDM, WDM, 40km, 60km WDM
  • ring and bus compatible
  • Device is also available with SFP port
Environmental Parameters
  • Extended temperature range: Operating Temperature: -40 to 70°C
  • Relative air humidity: up to 95% for +20 °C
  • Localization: class C according to PN-EN 60780-2-2
  • Supply voltage range: 100-240V DC , 110-260V AC
  • Power Consumption: up to 4W
  • Galvanic isolated power supply
  • Housing: 112 x 77 x 53mm
  • Suitable for mounting on DIN rail
  • Weight: 0.5 kg

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