BL121BN
BACnet to OPC UA HVAC Protocol Translator
BACnet to OPC UA Gateway BL121BN Series · 2 or 6 serial ports · Collects BACnet/IP, BACnet MS/TP building devices · Outputs OPC UA to SCADA/IIoT/Enterprise ✓ 2 or 6 RS485/RS232 ✓ 512 / 4,000 data points ✓ 10–50 BACnet devices ✓ WiFi optional ✓ -40~85°C wide temp 🏗️ BL121BN 2‑Port BL121BNP 6‑Port Supports 10–50 BACnet devices · 512–4,000 data points · Optional WiFi ⬇ BACnet/IP ⬇ BACnet MS/TP ⬆ OPC UA 📡 WiFi 📊
Key specifications
| BL121BN (Standard) | BL121BNP (High‑Performance) |
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| 2 × RS485/RS232 | 6 × RS485/RS232 |
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| 10 | 50 |
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| 512 | 4,000 |
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| BACnet/IP · BACnet MS/TP | BACnet/IP · BACnet MS/TP |
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| OPC UA | OPC UA |
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| ✓ 802.11a/b/g/n | ✓ 802.11a/b/g/n |
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| 30 × 83 × 110 mm | 40 × 83 × 110 mm |
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| 133 g | 171 g |
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| Small / Medium BAS Projects | Large‑Scale Facility Integration |
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| Communication | Ethernet, WiFi |
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| Downlink Protocol | BACnet MS/TP, BACnet/IP |
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| Uplink Protocol | OPC UA |
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| Serial Port | 2CH or 6CH RS485/RS232 |
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| Baud Rate | 2400bps-115200bps |
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| Ethernet Port | 1 WAN + 1 LAN |
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Supply information
| Manufacturer | BLIIoT — Beilai Technology Co., Ltd. |
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| Model code | BL121BN |
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| Full name | BL121BN | BACnet to OPC UA HVAC Protocol Translator |
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| Category | OPC UA gateways |
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| Supplied in Korea by | ACUSYS Co., Ltd. · Official BLIIoT distributor in Korea |
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