Industrial RS-232 to RS-422/485 Converter

  • Data rates up to 115.2 kbps
  • Three-way 2,000V optical isolation (input, output, power)
  • Wide operating temperature
  • UL Class 1/Division 2
  • Modbus ASCII/RTU compatible
  • 10–48 VDC input power range


Model 485DRCi industrial-grade isolated serial converter changes RS-232 signals to RS-422 for increased range, or to RS-485 for increased range plus multi-drop capability.

Designed for rugged industrial use, the 485DRCi is UL approved and certified for operation in  Class 1/Division 2 environments and also offers 2,000V 3-way optical isolation on input, output, and power lines. In addition to optical isolation, the unit has surge suppression on the RS-422/485 lines. This DIN rail mountable converter optically isolates and converts unbalanced, full or half-duplex, RS-232 signals to balanced RS-422/485 signals at baud rates up to 115.2 kbps. Configuration is made via a 12-position DIP switch on the bottom of the converter.

Featuring Automatic Send Data Control circuitry, the converter does not require special software control of handshake signals in RS-485 mode. Removable terminal blocks for power and RS-422/485 signals make wiring easy. It is powered by a supply voltage of 10 to 48 VDC which is isolated from all data and signal ground lines.

Part Number RS-232 Connector RS-422/485 Connector Isolation
BB-485DRCi DB9 Female (DCE) Removable Terminal Block 2,000 V
Serial Technology
Data Rate 1.2 to 115.2 kbps
Connector DB9 female (DCE)
Signals TD, RD, GND
Connector Removable terminal block, 28 to 14 AWG
RS-485, 2-wire Data A(-), Data B (+), GND
RS-422/485, 4-wire TDA(-), TDB(+), RDA (-), RDB(+), GND
Rating 2,000 V
Lines Protected 3-way (input, output, power lines)
Method Optical
Surge Suppression
Lines Protected Data lines
Rating 600W peak power dissipation
Clamping / Response Time < 1 pico-second
Industrial Bus
Connector Removable terminal block, 28 to 14 AWG
Voltage 10-48 VDC
Consumption 960 mW
Source External
LED Indicators Transmit, Receive, and Power
Dimensions 11.4 x 3.3 x 12.4 cm (4.5 x 1.3 x 4.9 in)
Enclosure 35mm DIN mount, plastic, IP30
Weight 204.12 g (0.45 lbs)
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 254617 hours
MTBF Calculation Methods Parts Count Reliability Prediction
Class 1 / Division 2 Wiring
Type Solid copper only
Size 28 to 14 AWG
Temperature 105 °C (221 °F) minimum
Terminal Torque 0.5 Nm (Newton-meters)
Approvals / Certifications
cUL 508, File Number: E222870 (C1 D2 E245458)
FCC Part 15, CISPR, EN 55022: 2010 + AC:2011 Class B 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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