Collecting Modbus slave device data needs to be configured in the BL101 configuration software. The connection method is connected through the WAN port, and a standard cross/straight network cable is used to connect to the router or switch to ensure that the BL101 gateway and the computer are in the same local area network. If you want to directly connect to the computer, use a standard crossover network cable to connect to the BL101 gateway LAN port (when the BL101 gateway LAN port is directly connected to the computer, the computer should be set to the specified IP, and the IP should be the IP of the network segment, because the LAN port leaves the factory The default IP is

Note: The WAN port is automatically obtained IP from the factory, the LAN port is the default IP, and the IP is

Double-click the left mouse button on the computer

"Run BL101 configuration software, the display interface is as follows:

Search for gateway devices

Clicking "Device Search" will search all devices on the same local area network as the computer. If the gateway device cannot be searched, please follow the steps on the right of the prompt box to check. For example: the WAN port is connected to the switch, the computer and the gateway are in the same local area network, and the gateway device with the IP of is found.

Connect the gateway device

Place the mouse cursor on the gateway device you want to configure, and double-click with the left mouse button (for example: double-click the gateway device whose IP is:, a prompt box "Reading successful" appears, click OK to enter the gateway device configuration interface.

Click the right mouse button on COM1, click Add Device, the device information configuration box will pop up, and configure the information of the device to be collected. For the established device name, double-click the mouse to pop up the configuration information of the device, and right-click to delete the device.

Note: The COM port supports collecting up to 50 Modbus RTU devices.

Device Information




device name

Name the device you want to collect data from

Device properties

Slave ID

Modbus communication address of the device to collect data

16-bit data type

Select from "AB", "BA".


32-bit data type

Select from "ABCD", "DCBA", "BADC", "CDAB".



Determine the configuration of device information


Cancel the configuration of device information

Add the data points to be collected by the COM port device

Click the name of the device, put the mouse in the right box, click the right mouse button, "Add" will pop up, click "Add", the data point information configuration box will pop up, and configure the data point information to be collected.

To add the next data point, click the right mouse button and click "Add". You can also modify or delete the created data point. Click the data point and right mouse button to delete the data. Double-click the data point to modify the configuration of the data point.

Configuration of Collected Data Points



variable name

Naming the collected data points

variable unit

unit of data point

address type

Select the Modbus function code of the collected data point, and choose from "01 read holding coil", "02 read input coil", "03 read holding register", "04 read input register".

initial address

The address of the collected data point

type of data

Select "Boolean" for Boolean, and the numeric type can be selected from "16-bit unsigned integer", "16-bit signed integer", "32-bit unsigned integer", "32-bit signed integer", "32-bit signed integer" Single-Precision Floating Point".

add quantity

Collection number

Read and write type

Select from "Read Only", "Read and Write".


Only numeric data can be set, how many times it can be enlarged or reduced and uploaded to the platform.

modbus map address

The data point is stored in the address of the gateway device, the range: Boolean 0~2000. Numerical 0-2000.

mqtt identifier

The MQTT identifier of the data point, which can be filled in arbitrarily.


Determining configuration information for a data point


Unconfigure a data point

Click the data point and right mouse button to delete the data, and double-click the data point to modify the configuration of the data point.

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