RS-422/485 Isolated Repeater

  • Extend data up to 1.2 km (4000 ft.)
  • 2000V optically isolated data lines
  • -40 to 80°C operating temperature
  • Modbus ASCII/RTU


The BB-485OPDR is an optically isolated RS-422/485 isolated line repeater that can be used to isolate a piece of equipment from the rest of the network. As a repeater, it extends the distance of an existing network an additional 1.2 km (4000 ft.) and expands it beyond the typical 32-node limitation. Data signals and the power inputs connect to the terminal block. 600W surge suppression ensures that the connected equipment is protected even in the harshest of environments. 2-wire RS-485, 4-wire RS-485 and RS-422 are supported. The repeater operates on externally sourced 10 to 30 VDC power. The enclosure has a DIN rail mount that is designed to fit easily on a standard 35mm rail.

Part Number Description
BB-4850PDR RS-422/485 Isolated Repeater
Connector Terminal block
Signals TDA(-), TDB(+), RDA(-), RDB(+), GND
RS-485 2-wire, RS-422/485 4-wire
Protected GND on isolated side
Method Optical
Rating 2000 V
Surge Suppression
Method TVS
Rating 6.5V bi-directional avalanche breakdown device
500W peak power dissipation
Response Time < 1 pico-second
Industrial Bus
Connector Terminal block
Voltage 10 to 30 VDC
Power Consumption 0.7 W
Source External source required
Terminal Blocks
Wire Size 24 to 14 AWG
Torque 4 kgf-cm
LED Indicators
2 Data LEDs (Red) Data LED for each side of isolator
Flashes when data transmitted
Material Plastic
IP Rating 20
Dimensions 2.5 x 7.9 x 9.5 cm (1.0 x 3.1 x 3.7 in)
Mounting 35 mm DIN (panel mount adapter is available)
Operating Temperature -40 to 80 C (-40 to 176 F)
Storage Temperature -40 to 85 C (-40 to 185 F)
Operating Humidity 0 to 95% Non-condensing
MTBF 225299 hours
MTBF Calculation Method MIL217F Parts Count Reliability
NEMA TS1 & TS2 Complies with NEMA TS1 & TS2
Environmental requirements for Traffic Control Equipment
Agency Approvals CE, FCC
cULus Recognized, File E222870

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