Overview
The B&B Electronics 485LDRC9 is an industrial-grade, optically isolated RS-232 to RS-422/485 converter designed for harsh environments and demanding control applications. It provides 2000V optically isolated data lines to protect connected equipment from electrical noise, ground loops, and transient interference common in factory automation, process control, and remote monitoring systems.
Key Features
- Extends data transmission up to 4000 ft / 1.2 km
- 2000V optically isolated data lines with integrated 500W surge suppression
- Switchable 120Ω termination for RS-422 and RS-485 networks
- Built-in send data control circuitry eliminates the need for external software to control handshake signals
- Supports Modbus ASCII/RTU protocols
- Wide operating temperature range: -40 to 80°C
- 35mm DIN rail mount for standard industrial cabinets
Technical Specifications
RS-232 connector: DB9 F (DCE) with signals TD, RD, GND; RS-422/485 interface via terminal block with signals TDA(-), TDB(+), RDA(-), RDB(+), and GND
Power supply: externally sourced 10–30 VDC
Enclosure material: plastic; Dimensions: 1.0 x 3.1 x 3.7 in (2.5 x 7.9 x 9.5 cm); Operating humidity: 0 to 95% non-condensing; MTBF: 257,448 hours; Agency approvals: CE, FCC, cULus recognized (File E222870)
Typical Applications
- Serial-to-network gateways for legacy PLC and RTU devices
- Distributed I/O modules and remote terminal units (RTUs) in oil & gas, water treatment, and power generation
- SCADA system integration with long-distance, multi-drop RS-485 networks
- Factory automation and assembly line control systems requiring galvanic isolation
- Industrial IoT gateways converting serial data to networked systems
Compatibility & Replacements
Compatible With
- Any RS-232 serial device (terminals, industrial computers, PLCs, modems)
- Multi-drop RS-422/485 networks supporting 2-wire and 4-wire modes
- Modbus RTU and Modbus ASCII serial protocols
- Industrial automation platforms and SCADA systems
- Standard 35mm DIN rail industrial cabinets
Replaces / Drop-In Replacement For
- Legacy B&B Electronics serial converter models in RS-232 to RS-422/485 applications
- Verify compatibility with your system integrator before ordering
Works With
- Any industrial control software supporting RS-232 or RS-422/485 serial communication (FactoryTalk, Wonderware, Ignition, etc.)
- Standard terminal emulation and serial monitoring tools
- SCADA front-end systems and data logging platforms
