Industrial RS-422/485 Isolated Repeater

  • Supports data rates up to 115.2 Kbps
  • Extends signal 1,200 m (4,000 feet)
  • Wide -40 to +80°C temperature range
  • 10 to 48 VDC input power range
  • 2000 V, 3-way optical isolation
  • UL Class 1/Division 2 Listed
  • Built-in, switchable termination & bias


The 485OPDRI isolated RS-422/485 repeater is designed for rugged industrial environments. It is  UL listed and certified for use in Class 1/Division 2 locations. Powerful optical isolation on both data ports protects your equipment and data from damaging ground loops and surges. Additional isolation on the power supply circuits add a third degree of protection.

Packaged in a rugged ABS plastic case, this repeater operates in wide temperature extremes. With a 35mm DIN rail mounting bracket, it easily integrates into control panels or other industrial equipment.

Installation and configuration is easy with DIP switches to set up baud rate and serial communications mode. Removable terminal blocks make wiring a snap. Power is connected through separate terminal block that accepts 10 to 48 VDC from any external source.

Part Number Description
BB-4850PDRI Industrial RS-422/485 Isolated Repeater
Serial Technology
RS-422 TDA(-), TD(B+), RDA(-), RDB(+)
RS-485 4-Wire TDA(-), TD(B+), RDA(-), RDB(+)
RS-485 2-Wire Data A(-), Data B(+)
Serial Connector 5 Position, Removable Terminal Block
Data Rate 2.4 to 115.2 Kbps
Isolation 2KV RMS, 1 Minute
Surge Protection 600 W Peak Power Dissipation
Clamping time < 1 pico-second
Industrial Bus Modbus ASCII / RTU
Bias Built-in, Switchable, 1.2KΩ XMT/RCV
Termination Built-in, Switchable, 120Ω
Source External power required
Power Connector 2 Position, Removable Terminal Block
Input Voltage 10 to 48 VDC (56 VDC Maximum)
Power Consumption 0.5 W (typical), 1.3 W (termination on both sides)
Terminal Blocks
Wire Size Accepted 28 to 12 AWG
Pitch 5.08 mm
Insulation Resistance ≥500 MΩ @ 500 VDC
Maximum Torque 5 Kg / cm
Power Red LED
Data Red LED for Each Data Port
Dimensions 12.3 x 11.3 x 3.2 cm (4.9 x 4.5 x 1.3 in)
Enclosure IP 20 Plastic, 35 mm DIN Mount
Weight 222 g (0.49 lbs)
MTBF 114696 Hours
MTBF Calc. Method Parts Count Reliability Prediction
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
Approvals FCC, CE, UL, UL Class 1 DIV 2, Groups A, B, C, D
UL File E222870 (HAZLOC E245458)

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