HD67C09-MSTP-G43-E-VPN-B2 – BACnet MSTP Slave to MQTT Broker converter with LTE, eSIM and VPN

Industrial BACnet MSTP Slave to MQTT Broker converter with LTE, eSIM and VPN service.

The HD67C09-MSTP-G43-E-VPN-B2 is an advanced industrial converter designed for secure integration of devices operating as BACnet MSTP Slave on RS485 networks with modern MQTT-based IoT platforms. The device combines BACnet MSTP Slave functionality with an integrated MQTT Broker and a built-in VPN service, ensuring encrypted and reliable remote data transmission.

The G43-E-VPN version is equipped with an LTE module supporting both a physical SIM card and an integrated eSIM. This guarantees high communication availability and redundancy, even in locations without permanent Ethernet infrastructure. The integrated VPN service creates a secure communication tunnel between BACnet MSTP installations and BMS, SCADA or cloud-based systems.

BACnet MSTP communication is handled via an RS485 interface terminated with a 3-way 5 mm screw terminal block, supporting data rates up to 115200 bps. On the network side, the device operates as an MQTT Broker, providing 10/100 Base-T Autosensing communication via the RJ45 Ethernet port and LTE connectivity.

Galvanic isolation between the Ethernet interface and the power supply improves system reliability and protects the device against electrical disturbances commonly found in industrial environments. The compact B2 Modulbox enclosure allows fast installation on a DIN 35 mm rail.

With compact dimensions of 70 × 60 × 95 mm and a wide operating temperature range from -40°C to +85°C, the HD67C09-MSTP-G43-E-VPN-B2 is well suited for harsh industrial conditions and space-limited control cabinets.

Key Features

• Integration of BACnet MSTP Slave with MQTT Broker.
• Secure communication via built-in VPN service.
• RS485 communication up to 115200 bps.
• Ethernet, LTE, SIM and eSIM connectivity.
• Automatic 10/100 Mbps data rate detection.
• Galvanic isolation between Ethernet and power supply.
• Industrial enclosure with DIN rail mounting.

Device configuration is performed using the dedicated SW67C09 software , which allows configuration of BACnet MSTP parameters, MQTT communication, VPN settings, data mapping and firmware updates.

Technical Specifications

• Protocols: BACnet MSTP Slave, MQTT Broker
• Service: VPN service
• Ports: 1× RS485, 1× Ethernet RJ45, SIM slot, integrated eSIM
• BACnet data rate: up to 115200 bps
• MQTT data rate: 10/100 Base-T Autosensing
• Power supply: 8…24V AC or 12…35V DC
• Power connector: 2-way 5 mm terminal block
• Operating temperature: -40°C to +85°C
• Dimensions: 70 × 60 × 95 mm (D × W × H)
• Weight: approx. 200 g
• Mounting: DIN rail
• Software: SW67C09
• Order Code: HD67C09-MSTP-G43-E-VPN-B2

The HD67C09-MSTP-G43-E-VPN-B2 is an ideal solution for projects requiring secure, remote and redundant integration of BACnet MSTP Slave devices with MQTT-based platforms, especially in distributed BMS installations and industrial applications using LTE communication.

Need technical support or assistance with device selection? Contact Consteel Electronics .