Industrial Isolated Converter

  • Extend data up to 1.2 km (4,000 ft.
  • 2 kV optical isolation on input/output
  • Wide operating temperature (-40 to +80 °C)
  • Modbus compatible
  • UL Recognized, NEMA TS2
  • Automatic Send Data Control


The BB-485LDRC9 is an optically isolated RS-232 to RS-422/485 converter. RS-232 signals interface through a DB9 female connector or a terminal block. RS-422/485 signals and power inputs connect to the terminal block. Terminal blocks are arranged to allow easy wiring inside a control panel.

Built-in Automatic Send Data Control circuitry allows quick set-up and eliminates the need for external software drivers to control handshake signals. The converter operates on externally sourced 10-30 VDC power.

Optically isolated data lines (2,000 V on input/output) with 500W surge suppression ensure that connected equipment is protected even in the harshest environments. DIN rail mount design snaps on standard 35mm rail and a small form factor fits neatly into tight cabinets.

The BB-485LDRC9 is ideal for critical industrial communications, factory automation, in-cabinet conversion, warehouse automation, security, and many other applications.

Part Number RS-232 Connector RS-422/485 Connector
BB-485LDRC9 DB9 Female or Terminal Block Terminal Blocks
Serial Technology
RS-232 - 2 options
Option 1: Connector DB9 Female (DCE)
Option 1: Signals TD, RD, GND
Option 2: Connector Terminal block
Option 2: Signals TD, RD, GND
Connector Terminal block
Signals TDA(-), TDB(+), RDA(-), RDB(+), GND
Termination 120 (switchable)
Connector Terminal Block
Signals TDA(-), TDB(+), RDA(-), RDB(+), GND
Modes 2-wire and 4-wire
Termination 120 (switchable)
Lines Protected Data lines
Method Optical
Rating 2,000 V
Surge Suppression
Lines Protected Data lines
Method TVS
Rating 7.5V bi-directional avalache breakdown device
500W peak power dissipation
Response Time < 1 pico-second
Industrial Bus ASCII/RTU
Connector Terminal block
Voltage 10-30 VDC
Consumption 0.5 W
Source External powering required
Terminal Blocks
Wire Size 24 to 14 AWG
Torque 4 kfg-cm
LED Indicators
Power (Red) On when power applied
TD (Red) Flashes when RS-422/485 data is transmitted
RD (Red) Flashes when RS-422/485 data is received
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 rail (panel mount adapter 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 257448 hours
MTBF Calculation Method Parts Count Reliability Prediction
Approvals / Certifications
cULus Recognized, File Number: E222870, NEMA TS2
FCC Part 15, CISPR, EN 55022: 2010 + AC:2011 Class A Emissions
EN 61000-6-1: 2007 Generic Standards for Residential, Commercial and Light Industrial Environments
EN 61000-4-2: 2009 Electro-Static Discharge (ESD)
EN 61000-4-3: 2006 +A1 +A2 +IS1 Radiated Field Immunity (RFI)
EN 61000-4-4: 2012 Electrical Fast Transients-Burst Immunity (EFT)
EN 61000-4-6: 2009 Conducted Immunity

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