MODBUS Redundant to multimode converter, DL485-MBR

The DL-485-MBR is a MODBUS to multimode fiber optic converter to create a redundant MODBUS network. As adapter you can make a selection between ST, SC and SC-BIDI. With BIDI technology you need only one fiber for transmitting and receiving the data.

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Product variants

Article Number Product Name
010007971 + DL-485-MBR/2x13-MM-ST MBR/MM/Ring + Request quote
DL-485-ST, MODBUS converter for ring connections over multimode fiber optic.
010007973 + DL-485-MBR/2x13-MM-SC MBR/MM/Ring + Request quote
DL-485-SC, MODBUS converter for ring connections over multimode fiber optic.
010007973-BIDI + DL-485-MBR/2x13-MM-SC-BIDI MBR/MM/Ring + Request quote
DL-485-SC-BIDI, MODBUS converter for ring connections over multimode fiber optic.


The fiber optic systems DL485-MBR secure the optical data transfer within MODBUS networks up to a data speed of 115,2 KBit/s. Our special multifunctional fiber optic system allows the construction of optical ring structures.

The system of this series is especially suitable for applications with strict safety-related requirements as for instance: process industry, tunnel ventilation systems and railway technology.

LEDs and potential-free contacts of a fault detector relay are able to signal defective states.

FiberView works similarly to a traffic light. If the “traffic light” is green, everything is fine. If the yellow LED lights, the budget is still tolerable, but already below a certain system reserve. Additionally to the LED, this pre-warning level is also signaled by a potential-free contact. If the “traffic light” turns red there is a serious error.


Fiber type:
Multimode 62,5 (50) /125 μm
Optical budget:
12 dB
FO range:
5 km (1 dB/km)
1310 nm (1310/1550 nm for BIDI version)
Data rate:
9,6 KBit/s, 19,2 KBit/s, 38,4 KBit/s, 57,6 KBit/s oder 115,2 KBit/s
Transmission type:
Half duplex
Terminating resistor:
Switchable: none or wave impedance (Rw + Rpd + Rpu)
RS485 Cable length:
RS485 connector:
9-pole Sub-D female and 6-pole terminal
Power supply (green) / Failure (red) / Data receive (green) / Status (red) / FiberView (red, yellow, green)
Power supply:
12 - 30 VDC, other voltages on request
Power consumption:
5 Watt, 200 mA (24 V)
Galvanic isolation:
500 VDC (24 VDC <> RS485)
Operating temperature:
-40°C to +70°C (Multimode and Singlemode with ST or SC), -20°C to +55°C (all others)
EN61000-6-2/EN55022 Class B + A1 + A2
570 g
H: 115 mm, W: 61 mm, D: 113 mm
Stainless steel, powder coated

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