BL121
Modbus to OPC UA Gateway BL121 Series · 2 or 6 serial ports · Downlink: Modbus RTU Master, Modbus TCP Master · Uplink: OPC UA ✓ 2 or 6 RS485/RS232 ✓ 512 / 4,000 data points ✓ 10–50 Modbus devices ✓ WiFi optional ✓ -40~85°C wide temp 🔌 BL121 2‑Port BL121P 6‑Port Supports 10–50 Modbus devices · 512–4,000 data points · Optional WiFi ⬇ Modbus RTU Master ⬇ Modbus TCP Master ⬆ OPC UA 📡 WiFi 📊 BL121 vs BL121P –
Key specifications
| BL121 (Standard) | BL121P (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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| Modbus RTU Master · Modbus TCP Master | Modbus RTU Master · Modbus TCP Master |
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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 OPC UA Integration | Large‑Scale Industrial Data Collection |
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| Communication | Ethernet, WiFi |
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| Downlink Protocol | Modbus RTU, Modbus TCP |
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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 | BL121 |
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| Full name | BL121 | Modbus to OPC UA Server Gateway |
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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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