Specifications 1. General Information Parameter Specification Product Family Modicon Modbus Plus Catalog Number NW-BM85S232 Description Modbus Plus Bridge/Multiplexer with RS-232 Port Device Type Network Bridge / Protocol Converter Primary Function Modbus Plus to Modbus ASCII/RTU conversion Mounting Panel mount or DIN rail 2. Communication Specifications Parameter Specification Network Side Modbus Plus Port: • 1 × 9-pin D-Sub female • 1 Mbit/s data rate • Transformer isolated • Peer-to-peer communication Serial Side RS-232 Port: • 1 × 9-pin D-Sub male • Baud rates: 300-19200 bps • Data bits: 7 or 8 • Parity: None, Even, Odd • Stop bits: 1 or 2 • Flow control: None, RTS/CTS Protocols • Modbus RTU (Master/Slave) • Modbus ASCII (Master/Slave) • Modbus Plus (Peer-to-peer) 3. Performance Specifications Parameter Specification Modbus Plus Addressing Node address 1-64 (DIP switch selectable) Serial Port Addressing Up to 247 slave devices Message Routing Store-and-forward Throughput 50 messages/second typical Latency 5-20 ms (message dependent) 4. Electrical Specifications Parameter Specification Power Supply 24 VDC or 115/230 VAC (model dependent) Power Consumption 15 W maximum Input Voltage Range • AC: 100-240 VAC, 50/60 Hz • DC: 20-28 VDC Isolation 1500 VAC between network and serial port 5. Physical Specifications Parameter Specification Dimensions (W × H × D) 180 × 80 × 140 mm Weight 1.2 kg Enclosure Metal housing Protection Rating IP20 LED Indicators • Power (green) • Modbus Plus activity (yellow) • Serial activity (yellow) • Fault (red) Configuration DIP switches + software 6. Environmental Specifications Parameter Specification Operating Temperature 0°C to +60°C Storage Temperature -40°C to +85°C Relative Humidity 5% to 95% (non-condensing) Altitude ≤ 2000 m Vibration 1 g @ 10-150 Hz Shock 15 g @ 11 ms 7. Functional Features Feature Description Protocol Conversion Modbus Plus ↔ Modbus RTU/ASCII Routing Table Static routing configuration Slave Emulation Appears as Modbus Plus slave to network Master Emulation Appears as Modbus master to serial devices Broadcast Support Modbus Plus global data Diagnostics Built-in self-test and network statistics 8. Configuration Parameters Parameter Options Modbus Plus Node ID 1-64 Serial Baud Rate 300, 600, 1200, 2400, 4800, 9600, 19200 Data Format 7E1, 7O1, 8N1, 8E1, 8O1 Modbus Mode RTU or ASCII Response Timeout 10-1000 ms Retry Count 0-3 9. Certifications & Standards Standard Description UL 508 Industrial control equipment CSA C22.2 No. 142 Process control equipment CE European conformity FCC Part 15 Class A Emissions Modbus Plus Schneider Electric proprietary network 10. Model Number Breakdown Code Segment Meaning NW Network/Communication device BM85 Bridge/Multiplexer 85 series S232 RS-232 serial interface