A passive RS-232 to RS-485 converter that extends serial communication distance up to 1.2km using balanced differential signalling. Self-powered from the RS-232 TX/RX or RTS/CTS lines — no external power supply required. Features opto-isolation and lightning/surge protection for reliable industrial communication.

The RS-232 side uses a DB9 female connector, while the RS-485 side provides both a DB9 male connector and a 4-position screw terminal block.

Key Features

• Passive Operation – Self-powered from RS-232 signal lines, no external power needed
• Opto-Isolation – Electrically isolated for noise immunity
• Surge Protection – Lightning and surge protectors built in
• 1.2km Range – Extends RS-485 communication up to 1,200m over twisted pair
• Dual RS-485 Connectors – DB9 male and 4-position screw terminal block
• 300–115,200 bps – Supports standard baud rates

Specifications

• Standards: EIA/TIA RS-232 and RS-485
• Working Mode: Asynchronous, half-duplex, differential transmission
• Transmission Media: Twisted pair or shielded twisted pair
• Baud Rate: 300–115,200 bps
• RS-485 Range: Up to 1,200m
• RS-232 Range: Up to 5m
• Operating Temperature: -25°C to 70°C
• Humidity: 5%–95%
• Dimensions: 82.6 × 31.8 × 15.2mm (3.25" × 1.25" × 0.6")
• Weight: 36g
• Compliance: CE, FCC, RoHS

Ideal For

• Extending RS-232 serial devices over long distances
• Industrial sensor communication (RS-485 bus)
• Building automation and SCADA systems

Package Contents

• 1× RS-232 to RS-485 Converter