Page Comparison

Datasheet page: https://vutlan.atlassian.net/wiki/spaces/DEN/pages/2903769089

Product page: https://vutlan.com/remote-monitoring-units/185-vt855t-remote-monitoring-system.html

Brochure: https://vutlan.com/index.php?controller=attachment&id_attachment=122

Drivers: https://vutlan.atlassian.net/wiki/spaces/DRIV/pages/2912583997

Date of release: 15.05.2023

Keywords: Remote monitoring system, SNMP monitoring device, Master monitoring unit, I/O controller, temperature monitoring, water leakage, remote environment, environment monitoring, IoT monitoring unit, remote environment monitoring, stand-alone monitoring, smoke detector, relay contacts, data center optimization, Server room monitoring, data center safety, data center optimization, remote power switch, server room environment,

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Function and purpose

“VT855t / Data Center 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.

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

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• VT740 / LTE slot modem

• VT485m / Modbus RTU extension or VT485r / OSPDv2 reader extension

• VT-ACCU / Rechargeable reservation battery or VT-BAT / Reservation battery 6F22 9V

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

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

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Order options / Dimensions

System	Diagram
VT855t
VT855tt
VT855tDC
VT855DC
VT855DCDC

Physical Description

Front panel:

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Back panel:

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

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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 1 / CAN 0" - Two digital connectors RJ12 for x2 RJ12 ports for the connection of CAN sensors/extensions/devices on a CAN bus. Modules connected to these connectors can be chained together. Read the instructions at "CAN devises connection", and "Setting up CAN".

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

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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.

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12. "DRY CONTACT INPUTS 1...32" - Digital inputs Dry contact input terminals (Type IN). Read the instructions at "Connecting dry contacts", and "Dry contacts settings".

13. "ISOLATED DRY CONTACTS OUTPUTS 1...8" - Digital Dry contact outputs 24VDC / 15mA (type OUT). Read the instructions at "Connecting dry contacts", and "Dry contacts settings".

14. “Battery Extension Slot” - Extension slot for “VT-ACCU / Rechargeable reservation battery” or “VT-6F22 / Reservation battery 9V”. Only one extension can be installed into this slot. Each extension is purchased separately.

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18. "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).

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• 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”.

21. "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)".

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26. "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

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Drawing dimensions

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19” 1U installation in a rack-cabinet

1.1		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.
1.2
2		Use x4 captive nuts and x4 M6 Screws to attached the unit to the rack.

Installing VT485m / RTU modem extension slot

VT855t 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.

Extension	Photo with the module installed
VT485r
VT485m

Installing LTE slot modem

VT855t has a slot for “VT740 / LTE slot modem”. The modem is ordered separately.

Extension	Photo
VT740

Installing reservation battery

The unit has an “Extension battery slot” at the back of the unit. You can install VT-BAT / Reservation battery 6F22 9V or VT-ACCU / Rechargeable reservation battery.

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Extending the number of sensors and devices connected to the system

Example	Picture	Link
1		You can connect CAN sensors and devices in a CAN bus chain. Read more at: CAN devices connection Setting up CAN
2		VT408 / Analog sensor extenion unit increases a number of connected analog sensors. Each unit adds x8 ports. This is a CAN device. Multiple devices can be connected in a CAN bus chain. See example #1. Read more at: VT408 / Analog sensor extension unit
3		Increases a number of connected dry contact inputs. Each unit adds x64 or x32 contacts. Read more at: VT440 / Dry contacts unit & VT32 / Dry contacts board extension
4		Add sensors and devices. See available devices: Sensors and meters www.vutlan.com

Package content VT855t series

Technical details

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

https://vutlan.atlassian.net/wiki/spaces/DEN/pages/705855489

Frequently asked questions

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