Legacy sensors speak only Modbus RTU, while newly deployed SCADA systems understand only Modbus TCP or OPC UA. To avoid the high cost of replacing entire equipment fleets, simply add a communication gateway between the field sensors and the new system – the BLIIOT BL120 IoT gateway.
|
Model |
WAN |
LAN |
COM (RS485) |
WiFi |
4G |
GPS |
|
1 |
1 |
2 |
× |
× |
× |
|
|
BL120L |
1 |
1 |
2 |
× |
√ |
× |
|
BL120LG |
1 |
1 |
2 |
× |
√ |
√ |
|
BL120W |
1 |
1 |
2 |
√ |
× |
× |
|
BL120P |
1 |
1 |
6 |
× |
× |
× |
|
BL120PL |
1 |
1 |
6 |
× |
√ |
× |
|
BL120PLG |
1 |
1 |
6 |
× |
√ |
√ |
|
BL120PW |
1 |
1 |
6 |
√ |
× |
× |
Scenario 1: Retrofitting Legacy Devices – Unlock Dormant Data at Low Cost
Many factories still operate a large number of old PLCs, instruments, and sensors that support only RS485 serial communication. Replacing them is prohibitively expensive, yet leaving them untouched prevents integration into the digital ecosystem. This is where a protocol translation bridge becomes essential – it connects to RS485 serial devices on one side and to Ethernet on the other, enabling legacy equipment to be "understood" by modern management systems such as SCADA and MES. With bidirectional conversion between Modbus RTU and Modbus TCP, it can simultaneously access up to 10 devices and collect 512 data points, which is more than sufficient for the networking needs of most small to medium-sized production lines.
Scenario 2: Smart Factory – Enable True Data Flow Across Production Lines
PLCs, drives, and smart meters on production lines generate massive amounts of data every day, but this data often remains trapped at the device level and cannot be aggregated upward to production management systems. By deploying an industrial gateway, these distributed Modbus devices can be unified into a single network, with real-time data reported to cloud platforms or on-premise management systems. The device provides 2 RS485/RS232 serial ports and 2 RJ45 Ethernet ports, with baud rates ranging from 2400 bps to 115200 bps – capable of handling both high-speed data acquisition and stable long-distance transmission.
Scenario 3: Unattended Remote Sites – Fewer Site Visits, Greater Efficiency
Water treatment pumping stations, power distribution rooms, and energy storage sites are often located in remote areas, making on-site inspections time-consuming and labor-intensive. When the gateway supports 4G or Wi-Fi wireless connectivity, operations personnel can monitor equipment status, receive alarm notifications, and even perform remote configuration and firmware upgrades without travelling to the site. The intelligent network redundancy design – wired priority with automatic failover to 4G when the wired connection is lost – ensures that critical sites never go offline.
Scenario 4: Energy Management and Green Low-Carbon – Drive Energy Savings with Data
Whether in factory energy consumption monitoring or HVAC retrofitting for commercial buildings, the core principle is the same: "You can only manage what you can measure." By consolidating distributed Modbus devices such as power meters, water meters, heat meters, and air-conditioning controllers, and aggregating their data for central reporting, energy usage becomes transparent and traceable. With a wide operating temperature range of –40°C to 85°C, the gateway performs reliably even in extreme cold or hot outdoor environments.
Visit our offerings: https://bliiot.com/products/modbus-gateway-bl120
