VT336POE / DIN Monitoring unit (legacy)


1. "LED: ACTIVITY" - green LED indicates appliance status

"LED: ERROR» - red LED indicates system error and traffic.

2. "Analog sensors: A1..A6" - x6 RJ12 analog sensor inputs with auto-sensing. Read instructions at "Analog sensors connection", and "Sensor configuration".

3. "USB" - type miniAB USB-port 2.0, required to connect a USB camera, USB flash, USB hub or to restore an appliance using USB flash.

4. "CAN" - digital connector RJ12 for the connection of CAN sensors and CAN extensions on a CAN bus, with auto-sensing. Read the instructions in "CAN devices connection", and "Setting up CAN".

  • "CAN Status" - LED for digital bus sensors:

  • The LED blinks slowly - nothing is connected

  • The LED blinks fast - configuration is in process

  • The LED glows constantly - connected to CAN devices

5. "LAN port" - Ethernet 10/100 Base-T port, provides an Ethernet connection and PoE (Power over Ethernet). Read more at "Connecting Power over Ethernet (PoE)".

  • "LAN Link" - orange LED for Ethernet port. It shows network traffic.

  • "LAN Activity" - green LED for Ethernet port. it shows network traffic. Flashes green when the system starts up. Shows the connection state (constant green light - the connection is established, blinking green - the connection attempt).

6. "DRY CONTACT INPUTS 1...4" - Digital inputs. Read the instructions at "Connecting dry contacts inputs", "Dry contacts settings".

7. "TEMPERATURE SENSOR" - accuracy +/- 1 °C.

8. "MODE" - a DIP switch for changing system modes.

  • Normal mode 🠀:  Normal operating state. The system should be always switched to this.

  • Recovery 🠂: Turns a recovery mode On. Use this option only in case you need to recover manufacturing settings. Read instructions at "Factory settings recovery".

9. "RESTART" - button restarts the appliance. Press the button for several seconds.

10. "OUTPUT 12V 0.25A" - 12V 0.25A output electronic relay terminal. Read the instructions at "Connecting 12V devices to 12V outputs".

11. "ISOLATED DRY CONTACTS OUTPUTS 1...4" - Digital outputs 24VDC / 15mA (type OUT). Read the instructions at "Connecting dry contacts inputs", and "Dry contacts settings".

12. "RS-485 MODBUS RTU" - port for connecting Modbus RTU / RS-485 sensors and devices. Read instructions in "Connecting Modbus devices", and "Configuring Modbus devices".

  • "RS-485 Status" - LED for displaying Modbus RTU port status.

13. "Reserve DC 12V 1A" - Reserve DC power input. Read instructions at "Powering VT336".

14. "Modem" - "VT770 / LTE, GPS modem" is ordered separately. Read the instructions at "Connecting VT770 / LTE modem with GNSS", and "Networking".

  • "Modem status" - LED displays modem status.

  • "SIM card slot" - Open the top cover to insert a SIM card.

  • "GSM, LTE main antenna" - Connect GSM or LTE main antenna.

  • "LTE auxiliary antenna" - Connect LTE auxiliary antenna (Auxiliary LTE antenna and antenna output are ordered separately from the modem). It helps to establish a stronger and more stable signal.

  • "GPS active antenna" - GPS antenna and antenna output are ordered separately from the modem. It allows one to set the time using GPS and shows the location of the device on the map.


Function & Order options & Technical specifications

Product info is located on the product page "VT336POE product page".

Connecting Power over Ethernet (PoE)

VT336POE is designed to extract power from a conventional twisted-pair Category 5 Ethernet cable, conforming to the IEEE 802.3af Power-over-Ethernet(PoE) standard. VT336POE signature and control circuit provides the PoE compatibility signature and power classification required by the Power Sourcing Equipment (PSE) before applying up to 15W power to the port. VT336POE provides a Class 0 signature.


VT336POE package content (legacy)

Mounting the device on a DIN rail


Insert the DIN rail holder as shown in the picture


Press the module onto the DIN rail, it should snap.


To dismantle the unit from the DIN rail:

  • Use a flat screwdriver and insert it into the DIN rail holder.

  • Pull the handle of the screwdriver to start pulling the DIN rail holder.

  • Now You can pull the enclosure from the DIN rail.

Mounting enclosure guards


  • Use pliers or a cutter to cut necessary plastic petals.

  • Use a screwdriver to make necessary holes in the plastic guards.


Simply slide it inside the empty spaces until it clicks.


Use a screwdriver to pull it out.

Using terminal connectors

The system uses terminal blocks for several interfaces:

  • x4 dry contact inputs

  • x2 Electronic relay outputs

  • x2 Isolated digital outputs

  • RS-485 Modbus RTU

  • Power supply input

They share the same characteristics.


Strip length

Wire cross-section

Screw head

Terminal blocks

Step: 5.08 mm

6 - 7 mm

0.23 - 0.27 in

2.5 mm²

0.09 in²

#26 - #12 AWG


3.5 mm

0.13 in

Using the table above, you can mount the cables.

Device configuration

  1. Initial Configuration (web interface)

  2. Configuring (web interface)