VT825DC / Monitoring unit with DC power supply

MSRP price: €659.00

  End of Life:  31.12.2022

The unit uses a power supply with two isolated DC +/- 48V inputs. Can use up to 100 different elements - notifications, triggers, timers, logic, sensors, dry contacts. Possible extensions are 1-Wire board for reader or board with 8 dry contacts, two relais 10A, and power backup input. 

Possibility to connect Internal LTE modem VT760 (ordered separately!)

Built-in extension units

There are built-in servers and agents like HTTP, HTTPS, SNMP v1, 2c, 3, SMTP, Radius, Syslog, FTP, DHCP, Watchdog.°C.

The external power supply is not included in the delivery.

Inlet 2A.jpg

DC power 48V

The unit is supplied by 48 V (mostly used by Telecom companies). In case the first power input shuts down, the system can automatically start to use the second power input. DC inputs are isolated from the earth! Customers can use either + or - on the ground. The power supply range is 14-70 V.

Sensor ports

Connect sensor by a supplied RJ-11 (6P4C) cable to any sensor port "A1 .. A8". The determination of the sensor type and connection will occur automatically.

Temperature sensor

The temperature sensor is built-in on board and sticks out on the front panel of the unit for better measurement. Accuracy equals +/- 1°C.

12V outputs

The unit has two 12V 0.25A outputs (electronics relays). E.g. the appliance has the possibility to connect alarm beacons managed by built-in electronic relays.

CAN port

Connecting CAN devices on a common bus allows you to collect data from the sensors with a large area, or from a large distance and to transmit them to the network. VT825DC has a LED for CAN bus status indication.

Dry contact inputs

VT825DC has 4 dry contact inputs. Can be used together with any contacts, for example with door or window contacts, circuit breakers, etc.

1-wire extension.jpg or

Extension: Modbus or 1-Wire

VT825DC has the possibility to install the "VT85 / Modbus extension board" or the "VT10 / 1-Wire board" extension (ordered separately).

1-wire extension.jpg


VT825DC has the possibility to install "VT85 / Modbus extension board" or "USB485 / RS-485 to USB adapter" extensions (ordered separately).

Extension: Internal LTE modem

VT805 has a possibility to install Internal LTE modem VT760 (Ordered separately!).  The modem is mounted and connected inside of the master unit. It is used for sending SMS notifications and receiving SMS commands.

VT18 extension (for VT825).jpg

Extension: VT18 (ordered separately)

Board is mounted and connected inside of "VT825DC / Monitoring unit". Adds 8 dry contacts (IN), 2 loads (latching relays with LEDs indicators on front panel) & a 12V DC power backup terminal. VT825 allows to install either VT18 or VT10, both extensions can not be installed at the same time.

1-wire extension.jpg

Extension: "VT10 / 1-Wire board" (ordered separately)

1-Wire board can be installed inside of monitoring unit to connect access reader or accurate temperature sensors. VT825DC allows to install either VT18 or VT10, both extensions can not be installed at the same time.

IP cameras

Using a built-in interface it is possible to add up to four IP cameras. This will allow viewing footage from surveillance cameras remotely,

USB camera

One USB camera (class Linux UVC Webcam which supports MPEG) can be connected to the "USB" port. More USB devices can be connected to one USB port using a USB hub.

USB flash drive

USB flash drive can be connected to VT825DC using OTG miniUSB cable and can be used by the system for saving logs. More USB devices can be connected to one USB port using a USB hub.



"ACT" - indicates appliance status, "E1" - indicates 12V "E1" relay status, "E2" - indicates 12V "E2" relay status, "ERROR»" - indicates error and traffic, "CAN" - indicates BUS status.

Chassis earthing

Chassis external ground earthing, to suppress electromagnetic interference.


Ethernet 10/100 Base-T port, provides a network connection.

Data sheet

Product dimensions
Width 440 x Height 44.45 (1U) x Depth 79.4 mm
Packaging weight
1,5 kg
Power input
+/- 48 V DC
Power Consumption
6-18 Watt
Operating temperature
Temperature : Min. -10° C - Max.+80° C
Chassis grounding (M4 thread)
Recovery switch
Restart button
Mounting possibilities
19" rack mountable
Wall turnable mount (with extension)
Max. distance from the unit
300 m
Manufactured in (country)
Manufactured in Slovak Republic, E.U.
HS Code
8471 50 000
Package includes
19" mounting brackets 2pcs
Patch cable RJ45 3m; Terminal: x2 pins, step 5 mm
Screws 6pcs M3 8mm
Self-adhesive rubber foot 4 pcs
Short description and connection guide
Terminal plug 3 pins 3.81mm 1pcs
Terminal plug 6 pins 3.5 mm 1pcs
Warranty card
Device management
Any infrastructure management software with support for SNMP v1, v2c, v3
Manually using SMS commands (Modem is ordered separately)
Web Interface using any browser
Brackets (accessories)
VT101 / Battery holder (for VT825, VT825DC) (ordered separately)
VT112 / Rotatable mounting brackets (ordered separately)
Inputs terminals
Analog sensor ports: x8 ports
CAN bus sensor port
Dry contacts / Digital inputs: 4 contacts (pitch 3,5mm, type IN)
Expansions (ordered separately) *
VT10 / 1-Wire board or VT18 / Extension board
VT700 / GSM modem
Processor *
ARM926-300 MHz / 64 MB / Linux-2.6.38
Extension protocols *
Network Interface *
1-Wire (with extension)
CAN bus
Ethernet 10/100 Mbit/s
Built-in sensors *
Power supply voltage sensor (1%)
Temperature sensor (Accuracy 1%)
Outputs terminals
SD card slot
Two 12V 0,25A outputs (pitch 3,81mm, 3P)
USB port for saving logs (USB flash)
Status Indicators *
Error LED
LED indication for CAN bus connection
LED indication for Power / Network connectivity
Two relay status LEDs


VT825 DC brochure

VT825 DC brochure

Download (3.7MB)

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