Overview
The Black Box IC107A is an async RS232 to RS422/485 interface converter designed for legacy serial device integration in factory automation, building automation, and process automation environments. This converter bridges RS232 equipment into existing RS422/485 networks, enabling reliable communication over extended distances.
Key Features
- Async RS232 to RS422/485 conversion with full-duplex 4-wire operation
- Transparent to data format; supports data rates up to 64 kbps
- Extended transmission distance up to 4000 feet (1219.2 m) over CATx cables
- Selectable RS232 interface mode: Data Terminal Equipment (DTE) or Data Communications Equipment (DCE)
- Point-to-point or multipoint (daisy-chain up to 64 units) configuration support
- 4-position terminal block on RS422/485 port for simplified installation
- Compact 1U rackmount form factor
Technical Specifications
Operational characteristics and environmental ratings for standard deployment:
- Data Rate: Up to 64 kbps (transparent to data format)
- Transmission Distance: 4000 feet (1219.2 m) over twisted-pair CATx
- Operation Mode: Full-duplex over 4-wire RS422/485 lines
- Power Input (IC107A-R3): 120 VAC, 60 Hz (via external power supply)
- Operating Temperature: 32 to 122°F (0 to 50°C)
- Storage Temperature: –4 to +158°F (–20 to +70°C)
- Humidity: Up to 95% noncondensing
- Dimensions: 1.75″H (1U) × 5.5″W × 9″D (44 × 140 × 229 mm)
- MTBF: 200,000 hours
- Connector Type: DB25 male (RS232 side); 4-position terminal block (RS422/485 side)
Typical Applications
- Connecting legacy RS232 devices to modern RS422/485 fieldbus networks
- Factory automation system integration and equipment retrofit
- Building automation and HVAC control system upgrades
- Process automation and instrumentation communication
- Multi-drop sensor and device networks requiring extended cable runs
- Point-to-point serial device bridging over long distances
Compatibility & Replacements
Compatible With
- Any RS232 serial device (terminals, modems, industrial equipment)
- RS422 and RS485 master/slave network architectures
- Point-to-point or daisy-chained multipoint configurations (up to 64 converters)
- Twisted-pair and shielded CATx cabling
- Equipment requiring DTE or DCE serial interface modes
Replaces / Drop-In Replacement For
The Black Box IC107A-R3 is a discontinued product with no manufacturer-designated replacement. Alternative modern converters include Black Box ICD100A (19.2 kbps, -40 to 80°C operating range) or comparable third-party RS232-to-RS485 converters with similar specifications. Verify compatibility with your system integrator before ordering a replacement unit.
Works With
- Industrial Ethernet and fieldbus protocols over RS422/485 backbone
- SCADA and supervisory control systems utilizing legacy RS232 serial devices
- Modbus RTU and other serial communication protocols
- DIN-rail or panel-mount industrial automation enclosures
- Manual RTS/DTR driver enable selection for RS485 half-duplex operation
