VT825t / Remote Monitoring System


Datasheet page: https://vutlan.atlassian.net/wiki/spaces/DEN/pages/2903736321/VT825t

Product page: https://vutlan.com/remote-monitoring-units/182-vt825t-remote-monitoring-system.html

Brochure: https://vutlan.com/index.php?controller=attachment&id_attachment=120

Drivers: https://vutlan.atlassian.net/wiki/spaces/DRIV/pages/2912583997/Latest+Vutlan+drivers+for+T+series+VT325t+VT335t+VT825t+VT855t


Function and purpose

“VT825t / Remote Monitoring System” is used for environmental monitoring (e.g. temperature, humidity, voltage, leakage, smoke, airflow). It is also used as an I/O controller (e.g. door control, fans, generator, control panels, UPS, circuit breakers, and alarms). Can use up to 1000 different elements - notifications, triggers, timers, logic schemes, sensors, dry contacts. Has a built-in Web interface with virtual sensors, logic schemes, different types of notifications, and control panels. Has a slot for an LTE modem for an ethernet connection reservation.

Includes x8 analog sensor ports, x1 Ethernet port, x1 Micro USB port, x1 CAN sensor bus port, x2 NC/NO/COM relays, x2 12V DC 0.25A relays, x16 dry contact inputs, x1 SD card slot, power reservation option for AC and DC.

Supports a full range of Vutlan analog sensors and CAN devices/sensors. Supports Modbus TCP/IP.

Possible extensions:

Notifications include E-mail, FTP log, Syslog, SMTP, SNMP Traps, Web-to-SMS, and PUSH.

Protocols include DHCP; HTTP; HTTPS; DynDNS; SSL; SNMP v1, v2c, v3; SMTP; FTP; Syslog; RADIUS; Modbus RTU; OpenVPN.

Virtual sensors include PING, timers, triggers, Logic schemes, SNMP GET, x4 IP cameras, Virtual math elements, and others.



Order options / Dimensions






x1 230V AC power inlet.


x2 230V AC power inlets, providing a redundant power supply for A&B power distribution.


x1 230V AC power inlet and x1 24-48V DC power inputs.


x1 24-48V DC power input.


x2 24-48V DC power input.











Physical Description

Front panel:


Back panel:

1. "1U 19-inch brackets" - x2 pcs for mounting brackets into a 1U 19" rack slot.

2. "Sticker space" - A place for a sticker, can be used by a user to place an identifier of the system (for example, an IP address).

3. "Analog sensors: A1..A8" - 8 RJ12 analog sensor inputs with auto-sensing. Read instructions at "Analog sensors connection", and "Sensor configuration".

4. "LAN port" - Ethernet 10/100 Base-T port, provides an Ethernet connection. Read more in this section "LAN, GSM, LTE, RADIUS, DNS, SSL, VPN".

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

  • "Green LED" - 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).

5. "Modem slot" - "VT740 / LTE slot modem" can be installed in this slot. This modem is ordered separately. Read instructions at "VT740 / LTE slot modem", and "LAN, GSM, LTE, RADIUS, DNS, SSL, VPN".

6. "CAN DEVICES" - digital connector RJ12 for the connection of CAN sensors/extensions/devices on a CAN bus. Modules can be chained together. Read the instructions at "CAN devises connection", and "Setting up CAN".

  1. "LED: CAN" - green LED indicates CAN bus status.

    • The LED blinks slowly - nothing is connected

    • The LED blinks fast - configuration is in process

    • The LED glows constantly - connected to CAN devices

7. “USB” - Micro USB ports is needed for USB camera recording, USB Flash for system logs, and system restoration. Read instructions in "Connecting USB camera", "USB camera settings. How to save a video", "Saving system logs on USB flash drive", and "USB upgrade or restore of default settings".

8. "Restart" - the button restarts the appliance. Hold the button for 2 seconds and then let go, and the system will restart.

9.1 "Activity" - green LED indicates appliance system status,

  • operating mode of the device: switches at a frequency of 2 times per second;

  • successful completion of the software update process: switches at a frequency of 4 times per second;

9.2 "Error" - red LED indicates error and traffic.

  • the operating mode of the device: If everything is normal, the LED is extinguished, if not - there's a constant glow;

  • software update mode: switches at a rate of 2 times per second;

9.3 "Alarm" - The LED can be programmed from the interface for alarm indication.

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

11.1 "E1, E2" - LED status indicators for 12V 0.25A Relay Outputs.

11.2 "R1, R2" - LED status indicators for x2 NC/NO/COM relays.

11.3 "CAN" - green LED indicates CAN bus status.

12. "DRY CONTACT INPUTS 1...16" - Digital inputs (Type IN). Read the instructions at "Connecting dry contacts", and "Dry contacts settings".

13. “Extension slot” - Only one of the two extensions can be installed “VT485m / Modbus RTU extension” or “VT485r / OSDP v2 reader extension”. Ordered separately.

14. "Chassis grounding" - Chassis grounding, M4 thread. Enhances the immunity of the equipment against conducted and radiated RF disturbances. Please contact a professional electrician before connecting it.

15. “Battery extension slot” - “VT-BAT / Battery reservation extension” can be installed in this slot. The extension is ordered separately.

16. "RESERVE" - Reserve power inlet. 100-240VAC, 50/60Hz, Fuse 2A, Fuse 5x20mm, type C14. Please refer to the section "Order options" in this document.

17. "MAIN" - Power inlet. 100-240VAC, 50/60Hz, Fuse 2A, Fuse 5x20mm, type C14. Please refer to the section "Order options" in this document.

18. "Relays 1, Relay 2" - NC/NO/COM power relay terminals. Read instructions at "Connecting NC/NO relays", "A relay switching (NC NO)", and "Relays (Outlets) (SNMP)".

  • The LED is ON (orange) - the relay is ON (the initial state can be configured).

  • The LED is OFF (orange) - the output is OFF (the initial state can be configured).

19. "OUTPUTS 12V 0.25A" - 12V 0.25A (for each output) terminals outputs (electronic relay). LED indicators are located on the front panel. Read the instructions at "Connecting 12V devices to 12V outputs".

  • The LED is ON (orange) - the output is ON (the initial state can be configured).

  • The LED is OFF (orange) - the output is OFF (the initial state can be configured).

20. "Factory reset" - reset settings to default factory settings. Keep pressing the button for more than 5 seconds. The “Error” LED will start blinking. This indicates that the factory restoration has started. Wait for 20-60 seconds for the system to restart. The “Activity” LED will start blinking once the system has been restarted. The device can be accessed now.

21. “N - R" - DIP switch is used for different system modes.

  • Normal mode: The switch is switched to the left ←. The switch should be always in this position.

  • Restore of appliance: The switch is switched to the right →. Used to load the clean system image from an SD card. Read the instructions at “Restore of appliance”.

22. "SD card" - MicroSD card slot with an ejector. The card is needed for data storage or the "system restore". Read instructions at "Saving system logs to SD card", and "Restore of the appliance (for VT960 series)".

23. "DC 12V BACKUP POWER" - This is a third backup option. The PCB has three power lines.

24. "RESERVE INPUT 24-48V" - Reserve power inlet. 24-48V DC, 5.08mm 2EDGK power plug, 18-72VDC to 12VDC/0.84A. Please refer to the section "Order options" in this document.

25. "MAIN INPUT 24-48V DC" - optional order option for some of the units. Please refer to the section "Order options" in this document.

Connection overview diagram



Drawing dimensions


19” 1U installation in a rack-cabinet


x2 19” brackets should be located in the package together with the system. Use x3 M3 screws to mount the brackets on each side of the unit.





Use x4 captive nuts and x4 M6 Screws to attached the unit to the rack.

Installing VT485m / RTU modem extension slot

VT825t has a slot for an extension. You can install only one module in this slot. You can install the “VT485m / Modbus RTU modem extension slot” or the “VT485r / OSDPv2 reader extension slot”. Both modules are ordered separately.


Photo with the module installed


Photo with the module installed



Installing LTE slot modem

VT825t has a slot for “VT740 / LTE slot modem”. The modem is ordered separately.








Package content VT825t series

Technical details

See a comparison table with technical details for each individual Vutlan monitoring unit at:


Frequently asked questions







The unit is not powering up.

The DIP switch is switched to “R” position.

Switch the DIP switch to “N” position (Normal).






Vutlan s.r.o. (LLC)

Remote Infrastructure Monitoring and Control

43 ul.Svornosti, 821 06 Bratislava,

Slovak Republic