VT335S / Monitoring unit

MSRP price: €439.00

  End of Life:  31.10.2022

Simple reliable monitoring unit with digital inputs for cost-effective remote computer room monitoring with all possible sensors. Order option: a) EU AC power adapter 12V / 1A; or b) 48V DC version: mounted in DC power supply 48/12V.   Possibility to connect Internal LTE modem VT760 (ordered separately!)

There are built-in servers and agents like HTTP, HTTPS, SNMP v1, 2c, 3, SMTP, Radius, Syslog, FTP, DHCP, Watchdog. Can use up to 100 different elements - notifications, triggers, timers, logic schemes, sensors, dry contacts.

Manuals: Installation and Configuration instructions

Latest drivers: Drivers

SNMP NMS: SNMP Software installation

Software: SNMP software, templates, etc...

Sensor ports

Connect sensor by a supplied RJ-11 (6P4C) cable to any sensor port "A1 .. A4". The determination of the sensor type and connection will occur automatically.

Temperature sensor

A temperature sensor is built-in on the VT335 DC board and sticks out on the front panel of the unit for better measurement. Accuracy equals +/- 1°C.

12V outputs

The module has two 12V 0.25A outputs (electronics relays). E.g. the appliance has the possibility to connect flashlights or sirens managed by a built-in electronic relay.

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.

Dry contact inputs

VT335S has 4 dry contact inputs. It 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

VT335S has the possibility to install the "VT85 / Modbus extension board" or "VT10 / 1-Wire board" extension (ordered separately).

1-wire extension.jpg


VT335S has the possibility to install "VT85 / Modbus extension board" or "USB485 / RS-485 to USB adapter" exntensions (ordered separately).

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 a USB port. More USB devices can be connected to one USB port using the USB hub. Cameras can be purchased here.

USB flash drive

USB flash drive can be connected to VT335S using OTG mini USB cable. Flash drive is used by the system for saving logs. More USB devices can be connected to one HS USB port using the USB hub.

12V DC.jpg

Power supply

Order options: a) 12VDC b) 24VDC c) 48VDC

Chassis earthing

Chassis external ground earthing, to suppress electromagnetic interference.


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



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


Type miniAB USB-port 2.0, Can connect USB camera; or connect a PC for restoring an appliance; or connect USB flash for saving logs.

Bracket: VT122 / 19" holder

The holder/bracket for the "VT335S / Monitoring unit" is ordered separately. 1U rackmount, 19".

VT123 Wall mount kit.jpg

Brackets: VT123 / Wall mount kit

Brackets for the "VT335 S / Monitoring unit" are ordered separately. The package includes two brackets.

VT124 DIn rail mount.jpg

Holder: VT124 / DIN rail holder

The DIN rail holder for the "VT335 S / Monitoring unit" is ordered separately.

Data sheet

Product dimensions
206 x 33.1 x 79.4 mm
Packaging weight
1.2 kg
Power input
Order option: a) EU AC power adapter 12V / 1A; or b) 48V DC version: mounted in DC power supply 48/12V.
Power Consumption
6 Watt
Operating temperature
Temperature : Min. -10° C - Max.+80° C
Chassis grounding (M4 thread)
Recovery switch
Restart button
Mounting possibilities
VT122 / 19inch bracket (ordered separately)VT123 / Wall mounts (ordered separately)VT124 / DIN rail mount (ordered separately)
Max. distance from the unit
225 m
Manufactured in (country)
Manufactured in Slovak Republic, E.U.
HS Code
8471 50 000
Package includes
Patch cable RJ45 3m
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
USB-Min to USB cableFor VT335 S 12V: 12 V EU AC adapter
Warranty card
Device management
via GPS (VT760 / LTE, GPS modem is ordered separately)
Brackets (accessories)
VT10 / 1-Wire moduleVT122 / 19inch bracketVT123 / Wall mountsVT124 / DIN rail mountVT700 / GSM modemVT760 / LTE, GPS modemVT
Inputs terminals
Analog sensor ports: x4 ports
CAN bus sensor port
Dry contacts / Digital inputs: 4 contacts (pitch 3,5mm, type IN)
Expansions (ordered separately) *
VT760 / Internal LTE, GPS 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 *
Temperature sensor (Accuracy 1%)
Outputs terminals
SMS with extension VT700 / GSM modem (ordered separately)SMS with extension VT760 / LTE, GPS modem (ordered separately)
Status Indicators *
Error LED
LED indication for CAN bus connection
LED indication for Power / Network connectivity
Relays status LEDs


VT335 DC Brochure EN

Download (1.27MB)

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