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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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VT485r

Cables

Reader U-prox SE Mini

Eastron SDM220-MODBUS

image-20240206-140600.pngImage Modified

 

B-

red

+12V

A+

blue

A+

GND

white

GND

Physical description

Example 2: (Not recommended) Daisy chain connection (the main controller is located in the middle of the chain)

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