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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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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).
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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
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