BACnet to OPC UA HVAC Protocol Translator BL121BN
  • BACnet to OPC UA Gateway
  • BACnet to OPC UA Gateway
  • BACnet to OPC UA Gateway
  • BACnet to OPC UA Gateway
  • BACnet to OPC UA Gateway
  • BACnet to OPC UA Gateway
  • BACnet to OPC UA Gateway
  • BACnet to OPC UA Gateway
  • BACnet to OPC UA Gateway
  • BACnet to OPC UA Gateway

BACnet to OPC UA HVAC Protocol Translator BL121BN

No.BL121BN
The BL121BN is a BACnet to OPC UA HVAC Protocol Translator, designed to bridge the gap between Building Automation and Control Networks (BACnet) and OPC Unified Architecture (OPC UA) in HVAC (Heating, Ventilation, and Air Conditioning) systems.
Communication
Ethernet, WiFi
Downlink Protocol
BACnet MS/TP, BACnet/IP
Uplink Protocol
OPC UA
Serial Port
2CH or 6CH RS485/RS232
Baud Rate
2400bps-115200bps
Ethernet Port
1 WAN + 1 LAN
Description
The BL121BN is a BACnet to OPC UA HVAC Protocol Translator, designed to bridge the gap between Building Automation and Control Networks (BACnet) and OPC Unified Architecture (OPC UA) in HVAC (Heating, Ventilation, and Air Conditioning) systems.

Key Features

Dual-Protocol Conversion

  • Downlink Support: BACnet/IP, BACnet MS/TP
  • Uplink Support: OPC UA (Industry 4.0 standard)
  • Capacity: Connects up to 10/50 devices & collects 512/4000 data points

Multi-Interface Expansion

  • Dual Ethernet: 1×WAN + 1×LAN (10/100M auto-sensing, supports switch cascading)
  • Dual Serial Ports: 2×RS485/RS232 (2400-115200bps, 7/8 data bits)
  • Dual USB: 1×Program download + 1×Debug port (Micro USB OTG)
  • Optional WiFi: BL121BNW model supports 802.11a/b/g/n (2.4G/5G dual-band)

Remote Management

  • Cloud configuration & firmware OTA updates
  • Real-time monitoring: chip temperature, memory, port status
  • Hardware/software watchdogs for system stability


Typical Applications

Smart Buildings: Integrate BACnet HVAC/lighting systems with OPC UA cloud platforms
Industrial Digitalization: DDC data collection → edge computing → cloud analytics
Remote Maintenance: Real-time equipment monitoring & alerts via WiFi

Technical Specifications

Parameter Description
System Processor Clock speed 300Mhz
Storage 128MB
Flash Memory 64MB
Power Supply Input Voltage DC 9~36V 
Power Consumption Normal: 70mA@12V, Max: 168mA@12V
Wiring Anti-reverse connection protection
Ethernet Port Specification 2 x RJ45, 10/100Mbps, adaptive MDI/MDIX
Protection ESD: ±6kV(Contact), ±8kV(Air)
EFT: 1kV, 5kHz
Serial Port QTY 2CH or 6CH RS485/RS232
Baud Rate 2400bps-115200bps
Data Bit 7,8
Parity Bit None, Even, Odd
Stop Bit 1, 2
Protection ESD: ±6kV(Contact), ±8kV(Air)
SURGE  ±1kV, 8/20us
EFT: 1kV, 5kHz
USB Port QTY 1xMini USB
Protection Over current protection
WiFi
(Optional)
QTY 1
Type SMA
Protocol 802.11a/b/g/n (mixed)
Mode Client Mode
Channel 2.4G Channel 1 - 13,5G Channel 36 - 165
Security Security
Encrypted AES, TKIP, TKIPAES
Speed 150Mbps (Max)
Distance Unobstructed/open outdoor coverage up to 20 meters
SSID broadcast switch Support
Indicator PWR Always on when device powered on 
RUN Flickering when system running
Off when system shutdown
LINK Flickering when Ethernet communication; Always on when 4G or WiFi communication; OFF when Ethernet, 4G, WiFi are all disconnected.
Software Internet Protocol IPV4, TCP/UDP, DHCP, DNS, etc
IP Retrieving Static IP/DHCP
Transparent Transmission Support
DNS Support Domain Name resolution
Configuration PC software configuration, support WIN 7, WIN 8, WIN 10 and WIN11
Network Cache Transmitting: 8Kbyte; Receiving: 8Kbyte
Safety Regulations EMC CE, FCC
EMS IEC 61000-4-2 (ESD) Level 3
IEC 61000-4-4 (EFT) Level 3
IEC 61000-4-5 (Surge)Level 3
Vibration IEC60068-2-6
Environment Working -40~85℃, 5~95% RH
Storage -40~85℃,5~95% RH
Others Housing Material Plastic
Size 40×83×110mm/30×83×110mm (LxWxH)
Protection  IP30
Net Weight 171g/133g
Mounting DIN Rail Mounting/Wall-mounting

Model Selection

Model WAN LAN COM(RS485)
(Optional RS232)
WiFi 4G GPS
BL121BN 1 1 2 × × ×
BL121BNW 1 1 2 × ×
BL121BNP 1 1 6 × × ×
BL121BNPW 1 1 6 × ×

Shipping Packaging
  • Industrial-grade Gateway x1
  • DIN35 mounting bracket x1
  • Connection Terminalsx1
  • WiFi antenna x1 (Optional)
  • Certificate of conformity x1
  • Warranty card x1
  • BACnet to OPC UA Gateway
  • BACnet to OPC UA Gateway
  • BACnet to OPC UA Gateway
  • BACnet to OPC UA Gateway
  • BACnet to OPC UA Gateway

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