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Isolated Converter RS-232 to RS-485

US Prices
CDN Prices

Privacy and Security Policy

General Product Information

The 485OI9TB converts unbalanced, full-duplex RS-232 signals to balanced full-duplex (4-Wire) RS-422/485 or half-duplex (2-Wire) RS-485 Signals. It also provides 1500 Volts RMS optical isolation of the data lines and ground between the RS-232 and RS-422/485 signals.

The RS-232 port has a female DB9 connector with Pin 3 (TD), Pin 2 (RD), and Pin 5 (Ground) passed through. The RS-422/485 port has a 6 position terminal block. The RS-232 side of the converter derives its power from the DTR (Pin 4) and the RTS (Pin 7) lines. One or the other must be raised to power the RS-232 side. The RS-422/485 side is powered by a 12 VDC power supply which is purchased separately.

Features and Details

  • RS-232 Connector: DB9F
  • RS-422/485 Connector: Terminal Block
  • 1500 V Optical Isolation
  • 10 to 14 VDC Power Input - Requires Power Supply sold separately
  • UL 508 Listed
  • FCC Class B
  • CE


Power Range AC: 0 to 0 Temp Range: 0 to 70
Mounting / Packaging: In Line UL: Yes
Class 1 Division 2: No Modbus: Yes
Automatic Send Data Control: Yes Power Range DC: 12 to 12
Power Source: External Power Max AC: No
RS-232: No RS-422: No
RS-485 2 Wire: Yes RS-485 4 Wire: Yes
TTL: No Current Loop: No
Multi-mode Fiber: No Single Mode Fiber: No
Isolation: Yes 3-Way Isolation: No
Brand: B&B Electronics    

Buy 485OI9TB on-line:
USA Office

Address: 1480 Gulf Road, Suite 837,
PO Box 1280
Point Roberts, WA 98281

Western Canada - Vancouver BC

Tel:1.800.663.6001 or 1.604.925.6150
Address: 2454 Haywood Ave
West Vancouver, BC V7V 1Y1

Eastern Canada - Markham, Ontario

Tel:1.800.465.0164 or 1.905.513.7027