Standard DIN rail-mounted enclosure. Single-mode optical fiber, SC pluggable socket. Model: BRT FB3285 Operating power supply: 12–57 VDC via wiring terminals. Input/output ports support RS485, RS232, or RS422. RS485 port features 600 W surge protection, withstanding up to 250 VDC. Up to 32 nodes supported on RS485 network. Equipped with status indicators for operation and power supply. Operating temperature range: –20 °C to +65 °C, non-condensing. Wide-input power supply: 12–57 VDC. Compliant with EIA/TIA RS232, RS485, and RS422 standards. RS485 ports use pluggable wiring terminals. SC port supports single-mode optical fiber with SC pluggable socket. RS485 termination resistors (for twisted-pair or shielded twisted-pair) added as required per application. Maximum node count: 32. Data transmission rate: 1200–115200 bps, auto-adaptive. Baud rates: 1.2 Kbps, 2.4 Kbps, 4.8 Kbps, 9.6 Kbps, 19.2 Kbps, 38.4 Kbps, 57.6 Kbps, 115.2 Kbps — auto-adaptive. Data format: 8 data bits, no parity, 1 stop bit. Optical fiber parameters: — A terminal: Tx 1310 nm / Rx 1550 nm — B terminal: Tx 1550 nm / Rx 1310 nm Power consumption: 1.5 W Maximum transmission distance: — Optical fiber: up to 20 km — RS485 over copper: up to 10 m at 9.6 Kbps — RS485/RS422 over copper: up to 1200 m at 9.6 Kbps LED indicator per channel for operational status. Storage temperature: –40 °C to +85 °C Operating humidity: 25%–95%, non-condensing Storage humidity: 0%–95%, non-condensing Color: As shown Material: Plastic Package includes: 1 × RS485 to fiber optic converter set