DSGW-081 Industrial Modbus BACnet Converter Gateway with RS232/485 Serial Interface

Model: DSGW-081 Industry Edge Computer Gateway Category:

DSGW-081 is a versatile industrial gateway supporting Modbus and BACnet, and with RS485/232 interfaces. It can be used as Modbus BACnet converter to make protocol translation between Modbus and BANnet, or a Modbus gateway to convert serial data to Modbus, or simultaneously collect data from all Modbus and BACnet devices and upload to the remote servers for data visualization.

DSGW-081 adopts NXP i.MX6 ULL automative-grade chip to provided robust core performance. With up to 8GB eMMC, DSGW-081 is able to implement agile connection, real time data optimization, and intelligent analysis on the IoT edge. Meanwhile, it supports both wireless protocols and wired protocols (BLE/Zigbee/Z-Wave/Wi-Fi/LTE 4G/Ethernet/Modbus/Bacnet/CAN/KNX) to satisfy a variety of complicated using scenarios.

DSGW-081 is an outperformed and versatile IoT controller/converter/coordinator hardware suitable for users to develop application and install firmware on it, widely used in industrial automation, SCADA energy management, predictive maintenance, building automation, and so on.

Quick View of DSGW-081 NXP IoT Gateway with Serial RS232/485 Port

  • Automotive-grade chips and fully industrial design to meet harsh environmental requirements;
  • Industrial Edge Computing capability reduces data flow between field sites and data center, avoiding bottlenecks of cloud-end computing;
  • Uninterrupted remote access for industrial machines and equipment via LTE CAT1/M1 and Ethernet;
  • Multiple wireless protocols, such as KNX, Bluetooth, and Zigbee, enabling seamless connectivity and communication among devices;
  • Dual SIM cards, link backup, and VRRP hot standby are built-in redundancies that provide uninterrupted network connectivity.
  • comprehensive security protection;
  • Support Python and Java configuration for developing user-customized applications and port application directly to our gateway;
  • Supports industrial cloud platforms: Microsoft Azure, Amazon AWS, etc.;
  • Simple Large-scale deployment and management: the Device Manager cloud platform and SNMP protocol are supported for effective remote central management;
  • Ready certification: FCC, CE, SRRC, BQB, Zigbee, PTCRB, CCC…

Parameter of DSGW-081 Modbus/Bacnet Serial Gateway

CPUARM Cortex-A7,800Mhz
RAMUp to 512MB
Flash8GB eMMC
Indicator LEDs• Power LED normally on when powered on
• Zigbee/BLE/Z-WAVE LED is flash when the signal come
• Network LED is flash, When the gateway can access the Internet
• Ethernet LED is flash, When the network port is plugged into the Internet cable
• LTE Signal LED, It indicates the signal strength of LTE
Reset ButtonThe reset button is hole button, After pressing the reset button for more than 5 seconds,
the Gateway will be restored to the factory settings.
SIM card Slot2*Drawer card slot
Industry ProtocolBACnet; Profinet; Ethernet/IP; Modbus; OPC/UA
Antenna3*SMA,1*LTE, 2*2.4GHZ

Features of DSGW-081 Modbus MQTT Converter Gateway Serial

Multiple Backhaul Connectivities

Capturing data from end devices and sends it to the cloud via 4G(CAT1), and Ethernet


Connecting various sensors/devices through Zigbee3.0, Modbus gateway RS485/232, I/O Interface, Wi-Fi, BLE 5.2, CAN,KNX and LTE (CAT M1)

dsgw081 gateway multiple backhaul connectivities
industrial grade design​

Industrial-Grade Design

Coming with Rugged enclosure protection for protection from water and dust ingress, ideal for the harsh environments. Wall-mount and DIN-rail mounting options.

Dimension and Package of DSGW-081 PLC IoT Modbus MQTT Gateway

Dimension 2
081 Package List
Package List

Protocols and Interfaces Options of DSGW-081 KNX/CAN/I/O Interface Gateway

ModelEthernetRS485CANI/O InterfaceBluetooth 5.0Zigbee 3.04G LTE Cat1Wi-FiKNX

Developer Resources of DSGW-081 PLC IoT Modbus MQTT Gateway


Third-Party Software

Use Cases of DSGW-081 PLC IoT Modbus MQTT Gateway

Energy Management

remote meter reading | solar data logger

Smart Manufacturing

IoT OEE optimization | Industrial Lighting

Predictive Maintenance

IoT elevator | Pharma Storage

Smart City

Utility Management | AIoT Community

DSGW-081 IoT Gateway Converter/Coordinator FAQs

How many devices (slaves) can be connected on the RS485 Modbus? Practically, how many devices tested using RS485 Modbus?

32 can be connected.

What are the benefits of using NXP i.MX 6ULL?

The NXP i.MX 6ULL-based industrial-grade embedded Linux Core Board has power management integration and an ARM Cortex-A7 processor. It supports interfaces like USB, Ethernet, audio, display with touch panel, and serial interfaces and offers a variety of memory configurations such DDR3L, NAND, eMMC, and SD memory cards. The system is appropriate for embedded systems-focused, industrial-grade applications.

We need LINUX OS in the device, not OpenWRT. Is DSGW-081 Debian-based or Ubuntu-based running OS?

Ubuntu OS with 8GB eMMC,suitable for you to store device log information.

What is BACnet protocol?

Building Automation and Control Networks is what BACnet stands for. It defines a communication protocol standard especially to offer a method of integrating building control systems produced by various manufacturers. The BACnet protocol makes it easier to apply and operate digital control technology in buildings by providing an abstract, object-oriented representation of information that is transmitted between such equipment. Products made for lighting control, fire and life safety systems, HVAC&R control, and other building automation functions are now simple to be monitored and controlled via BACnet gateways.

What is a BACnet gateway?

BACnet is the most widely used open protocol in building automation and energy management systems. BACnet devices talk to one another over a network. The Master-Slave Token-Passing network (BACnet MS/TP) and the Internet Protocol (BACnet/IP) are two of the more well-known networks. BACnet routers are needed to connect BACnet networks, whereas BACnet gateways connect and devices that use various network protocols, such as Modbus, to a BACnet network. Meanwhile, A variety of protocols transmit encoded data to BACnet gateways, which decode the data and then re-encode it according to the intended protocol. This is what makes it possible for devices that do not support BACnet to function in a single building automation system based on BACnet network.

Meanwhile, DSGW-081 also functions as an IoT gateway, enabling users to simultaneously collect data from all Modbus and BACnet meters, sensors, and outside devices via RS232/RS485/LAN ports before uploading the information to the cloud servers over an Ethernet or LTE 4G connection.

dsgw 081 bacnet gateway

BACnet IP vs MS/TP, What’s the difference?

BACnet MS/TP (master-slave/token-passing)
A common BACnet data link with baud rates ranging from 9.6 kbaud to 76.8 kbaud. It is an older version of BACnet that uses twisted pair cable (RS-485 standard) to build a separate network and offers its own logical link control to BACnet's network layer. It is not possible to default or alter the physical network setup. It must be installed with specific end-of-line and biasing resistors.
The BACnet community needed a plan for utilizing the BACnet protocol in an IP environment as TCP/IP's popularity skyrocketed. The BACnet standard's body uses MAC addresses exclusively for all data lines, including Ethernet. BACnet/IP is created to prevent the standard from being rewritten. Ethernet connections and IP networks can be used for BACnet/IP communication. This eliminates the requirement to run a standard MS/TP twisted pair of RS-485 wires. The benefits is that the network jack on the gadgets can accept an Ethernet cable, and an IT/OT expert or system integrator then configures a network.
Read further at: What is a BACnet Gateway and BACnet Router?

How does BACnet Modbus gateway work with PLC?

Industrial PLCs frequently use the communication protocol known as Modbus. The PLC devices must, however, communicate in a standard language in order to guarantee the compatibility of every device on the network. Without a BACnet gateway to convert Modbus registers into BACnet objects, BACnet devices on this network (BACnet IP or BACnet MS/TP) will not be able to connect with the PLC. Here we show how to use DSGW-081 Modbus BACnet gateway converter:

  • To use DSGW-081, the first step is to turn on DSGW-081 and use an Ethernet cable or RS232/RS485 cable to connect DSGW-081 and the PLC to the topology.
  • Secondly, use the router to get the IP address of DSGW-081 and connect it to the network, and then utilize the IP address to access the gateway.
  • Thirdly, you must configure the LAN port to be in the same network of the PLC, in order to enable gateway to access the Ethernet-based PLC.
  • Fourthly, add a PLC machine (take Modbus TCP as an example). Click Add PLC after selecting Edge Computing > Device Supervisor > Device List. Choose ModbusTCP as the PLC protocol and set the PLC communication parameters on the device adding page. (The default port number is 502, and the byte order is abcd. Adapt them as necessary.) The device name must be distinct, please note.
  • Fifthly, add Modbus TCP variables on the Device List page, then set the variable's parameters in the pop-up box. Parameters may including Variable Name, Register Type, DB Number, Register Address, Data Type, Decimal Places, Size, Register Bit, Read/Write, Unit, Description, and Group.
  • Sixth, configure an alarm policy parameters by selecting Edge Computing > Device Supervisor > Alarm > Alarm Strategy. The alert is activated when its value is greater than 30 but lower than 50; Otherwise, the alarm is either not activated or dismissed.
  • Seventh, after finishing the previous steps, you can view the status of data collection at Device List page and monitor the PLC data and the alarm locally. You can also choose to configure a cloud service to report and receive data.

What is Modbus protocol?

Modbus is the most used network protocol in the industrial production industry. It is a request-response protocol that is implemented utilizing a master-slave connection (the term "server and client" has since been used instead). When devices are connected to buses or networks, Modbus is used to transfer data across Ethernet, serial lines, and, increasingly, wireless. Modbus Servers are the devices that provide the information, whereas Modbus Clients are the devices that seek the information.

Modbus protocol is typically used to communicate between a programmable logic controller (PLC) and a supervisory control and data acquisition (SCADA) system. The fact that it is open source, easy to use, and free for manufacturers to include into their equipment without having to pay royalties makes it superior to competing protocols. The Modbus protocol is available in serial line (Modbus RTU and Modbus ASCII) and Ethernet (Modbus TCP) variations. You can explore more about Modbus RTU vs Modbus ASCII vs Modbus TCP/IP in this article: Modbus protocol in IoT.

What is Modbus gateway?

Modbus gateway is capable of converting serial to Modbus by allowing the legacy of Modbus RTU/ASCII devices to operate on a Modbus TCP network. It is a converter which can convert the data of Modbus RTU to the data of Modbus TCP. Noted that Modbus protocols can classify into two types, one is RS485 based Modbus RTU(or ASCII), and the other is Ethernet-based Modbus TCP. You can explore more Modbus RTU Gateway vs Modbus TCP Gateway here.

Additional information





CPU Architecture



BLE, Bluetooth, GPS, LoRa, LTE, Sub-G, Wi-Fi, Zigbee




GPIOPin, M.2 SATA3.0, Micro HDMI, Mipi camera, MIPI-DSI, PCIe, SD card, SIM card, TF card, Type-C, USB2.0, USB3.0


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1G, 2G, 4G, 8GB


16GB, 32GB, 64GB, 128G


AWS, Azure, Chripstack, Helium, Home Assistant, LORIOT, The ThingsStack, ThingsBoard, TTN, Tuya


Edge Computing, Smart Apartment, Smart Home

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