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Latest Vutlan drivers (from August 2021) support Modbus RTU read and write functions for all monitoring systems. |
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Function and purpose
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Allows to monitor up to 32 Modbus RTU devices/meters/sensors. The maximum distance of a daisy chain is up to 1000 meters. Each metered value of a Modbus device is addressed individually using input registers and is shown by the system as virtual sensors. You can configure thresholds and icon representations for these elements.
It can be used with VT335t, VT336t, VT825t, and VT855t monitoring systems. A slot PCB board can be inserted inside the monitoring unit while the unit is in operation. Has an internal termination and by default, it is switched ON (if required can be turned off).
Use cases
The Modbus RTU monitoring extension has various use cases across multiple industries and applications:
Industrial Automation: The extension can be used to monitor various industrial devices and meters, such as temperature sensors, flow meters, or energy meters. It allows for precise real-time monitoring and control of processes.
Building Management Systems (BMS): In a BMS setup, the extension helps monitor HVAC systems, lighting, and energy consumption using Modbus-compatible devices, ensuring efficient energy management and operation.
Data Centers: This extension can track critical environmental data such as temperature, humidity, or power usage across multiple Modbus-enabled devices within a data center, ensuring optimized conditions and early alerting in case of abnormalities.
Energy Management: For monitoring solar inverters, battery management systems, or other power meters, this extension facilitates efficient data acquisition and allows operators to maintain optimal energy flow and usage levels.
Remote Monitoring of Critical Infrastructure: The extension is useful in applications where remote sensors are deployed, such as in oil and gas pipelines, utility substations, or other infrastructure that requires remote monitoring and control.
These use cases make the extension crucial for maintaining operational efficiency, enabling preventive maintenance, and ensuring safety across industries.
Technical specification
Function & Purpose | Description |
Device type: | Extension PCB slot |
Used for: | For connecting industrial Modbus RTU devices, sensors, systems, & meters. |
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Communications | Description |
Control: | In Vutlan web interface |
Interface: | Modbus RTU, RS485 |
Max. distance: | up to 1000 m |
Inputs/Outputs: | Terminal 3P (B-, A+, GND), pitch 3.5 mm |
Terminator: | Located on PCB, by default turned ON. |
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Environmental | Description |
Operating temperature: | Optimal temperature range: -10° C to +80° C |
Operating humidity: | 0 to 95 % (non-condensing) |
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General | Description |
Manufactured in: | Slovak Republic, E.U., by Vutlan s.r.o. |
HS code: | 8517 69 90 |
GTIN: | 8588009886334 |
Physical description
By default, the terminator on the board of VT335t, VT825t, and VT855t is always ON.
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Sensors are connected in a daisy chain connection.
120Ω resistor is used at the end of the chain which is equal to the resistance of the cable.
A twisted pair cable is used for A(+) and B(-).
"VT335t, VT825t, and VT855t monitoring units" have an internal termination, and by default, it is switched to the ON position. (If it is required, it is possible to switch it OFF)
Up to 32 devices can be used.
Overall cable length is no more than 1000 meters.
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Example 2: (Not recommended) Daisy chain connection (the main controller is located in the middle of the chain)
"VT335t, VT825t, and VT855t monitoring units" have an internal termination, and by default, it is switched ON.
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Sensors are connected in a daisy chain connection.
120Ω resistor is used at the ends of the chain which is equal to the resistance of the cable.
A twisted pair cable is used for A(+) and B(-).
Up to 32 devices can be used.
Overall cable length is no more than 1000 meters.
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Activation and Configuration of Modbus interface
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After all Modbus devices have been connected to it, you need to activate it and configure:
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Accessories
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Some recommended readers Modbus configurations for tested sensors tested by Vutlan
Testing VT485m PCB using two Vutlan controllers
This section is useful for installers.
You can test the VT485m PCB using x2 Vutlan monitoring units.
Install VT485m on Vutlan monitoring system A and Vutlan monitoring system B.
Connect B- to B-. Connect A+ to A+.
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Do not connect the GND!!! |
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| VT485m | Cables | VT485m |
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| B- | red | B- |
A+ | blue | A+ |
Activate Modbus RTU settings on both systems. You can leave all settings by default on both systems. Web UI >> Preferences panel >> Modbus RTU tab >> Enable Modbus RTU
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Web UI >> System tree panel >> Add element “+” sign >> Modbus RTU (reading) >> Leave all settings by default >> Additional tab >> Test button
The VT485m which is the master will blink with a blue LED.
The VT485m which is the slave will blink with a red LED.
Test complete!
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It is ok, if “Modbus value, “Modbus raw answer” values give errors, because the PCB are not meters. They do not have the values by themselves. |
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Copyright:
Vutlan s.r.o. (LLC)
Remote Infrastructure Monitoring and Control
43 ul.Svornosti, 821 06 Bratislava,
Slovak Republic