VT855i / Data center monitoring unit
Monitoring system with redundant power supply
The unit 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, 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 a VT740 LTE Slot modem (ordered separately!) for an ethernet connection reservation.
Order options:
VT855i x1 230V AC power inlet
VT855ii x2 230V AC power inlets
VT855iDC x1 230V AC and x1 24-48V DC power inlets
VT855DC x1 24-48V DC power inlet
VT855DCDC x2 24-48V DC power inlets.
Order options
VT855i | x1 230V AC power inlet. |
VT855ii | x2 230V AC power inlets, providing a redundant power supply for A&B power distribution. |
VT855iDC | x1 230V AC and x1 24-48V DC power inlets. |
VT855DC | x1 24-48V DC power inlet. |
VT855DCDC | x2 24-48V DC power inlets. |


Device Management: | VT855i / VT855ii |
---|---|
Web, SNMP, manually via SMS | ✓ |
Interface | |
LAN: Ethernet 10/100 Mbit | ✓ |
OS: Linux | v.5.40 |
RAM: | 128Mb |
CPU speed: | 600mHz |
Clock: Built-in clock Watchdog: Built-in watchdog timer | ✓ |
Max. amount of sensors: physical sensors, dry contacts, relays | 150 |
Max. amount of elements: notifications, triggers, timers, logic, sensors, dry contacts, SNMP Get, SNMP Trap, and other elements | 1000 |
Protocol support | |
Network protocols: DHCP; HTTP; HTTPS; DynDNS; SSL/TLS; SNMP v1, v2c, v3; SMTP; FTP; Syslog; RADIUS; Modbus RTU; OpenVPN | ✓ |
VPN: secure data communications; secure change of connection between LTE and LAN | ✓ |
SSH: Provided as a separate patch. | ✓ |
Alerts / Notifications | |
Alert types: E-mail, FTP log, Syslog, SMTP, SNMP Traps, SMS (Modem is ordered separately), Web-to-SMS, PUSH | ✓ |
A maximum number of "mail to" recipients in an E-mail notification: | 20 |
A maximum number of "SMS to" recipients in an SMS notification: also the maximum amount of phone numbers | 20 |
Virtual sensors | |
Pings: Built-in function for server pinging. Test the reach-ability of a host in a network. | ✓ |
IP cameras: Connect the IP MJPEG camera with a proxy via the master module. Only view. | 4 |
Get SNMP: Read data from external equipment via SNMP PDU GET (v1/2c) | ✓ |
User keys: Add users who have access using RFID reader. | ✓ |
Logic schemes: Used to specify automatic actions to events that occur in the system. | ✓ |
Timers: Allows you to plan the events in the system. | ✓ |
Triggers: Generate events in the system if logic is triggered. | ✓ |
SNMP traps | ✓ |
Virtual Math element (combine several sensor data and calculate new data) | ✓ |
Logic schemes | ✓ |
Modbus TCP/IP: read/write | ✓ |
Power | |
Note: The system is sold in different order options. The power inputs will depend on your options. | |
Power input AC: | 90-230V |
Power input DC: | 24 ÷ 48V |
Fuse: Fuse at the inlet | 1A |
Max. power consumption: | 30W |
The maximum current load on the relay: | 10А |
Redundant power supply: built-in voltage monitor, voltage range 9-12.6V. Available only for systems with two power supplies. See order options. | Yes, for redundant order options. |
Outputs | |
Relay outputs: latching relays 240V*10A | 2 |
Relays outputs: 12V 0.25A | 2 |
Max. dry contact outputs (contact closures/digital outputs) | 8 |
Inputs | |
Analog port: 6P6C for connection of any analog sensor. | 8 |
CAN port: Max number of sensors Use CAN-12V-1A for connecting more than 12 devices. | 32 |
Dry contact inputs: | 32 |
Modbus: (Max. 32 sensors, Max. line length 1000m) | 1 |
Reader 1-Wire | 1 |
Video | |
Video cameras: | USB, x1 IP |
Other connectors | |
Ethernet port: 10/100Mbit | ✓ |
USB 2.0 Type A | 1 |
USB 2.0 micro | 1 |
External Memory | |
SD card slot | ● |
Extensions (modules are ordered separately) | |
Modem (extensions) | |
4G LTE Slot modem: ordered separately. | VT740 |
Modem modes:
| Gateway / Access / SMS |
Embedded sensors | |
Temperature sensor: +/- 1 °C Case temperature. | ✓ |
Power supply voltage sensor: Accuracy (1%) | 2 |
Environmental characteristics | |
Operating temperature: -10 to 80 °C | ✓ |
Storage temperature: –25 to 85 °C | ✓ |
Operating humidity: 0 to 90 %, non-condensing | ✓ |
Storage humidity: 0 to 95 %, non-condensing | ✓ |
Other Features | |
Installation: | 19” 1U |
Dimensions (L x W x H) in mm: | 440*44*90 |
Weight: | 1,5 kg |
External chassis grounding: M4 thread | ✓ |
Web interface (panels) | |
Dashboard panel: | ✓ |
System tree panel: sensors and devices displayed in a hierarchy | ✓ |
Event log panel: | 300 |
List of latest sent SMS messages: | 200 |
Supported Vutlan environmental sensors | |
Temperature, Outdoor Temperature, Humidity, Water leakage, Wind speed meter, Access sensor, Door sensor, Water Level, AC / DC current meters, AC voltage monitor, Smoke detector, Vibration, Motion / PIR, Converter and etc. | ✓ |

Monitoring system with redundant power supply
The unit 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, 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 a VT740 LTE Slot modem (ordered separately!) for an ethernet connection reservation.
Order options:
VT855i x1 230V AC power inlet
VT855ii x2 230V AC power inlets
VT855iDC x1 230V AC and x1 24-48V DC power inlets
VT855DC x1 24-48V DC power inlet
VT855DCDC x2 24-48V DC power inlets.
related products
Monitoring system with redundant power supply
The unit 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 elements - notifications, triggers, timers, logic schemes, sensors, and dry contacts. Has a built-in Web interface with virtual sensors, logic schemes, different types of notifications, and control panels. Has a slot for a VT740 LTE Slot modem (ordered separately!) for an ethernet connection reservation.
Order options:
VT855i x1 230V AC power inlet
VT855ii x2 230V AC power inlets
VT855iDC x1 230V AC and x1 24-48V DC power inlets
VT855DC x1 24-48V DC power inlet
VT855DCDC x2 24-48V DC power inlets.ts.