Didactum 500T Monitoring System - Basic IT Protection via SMS

IT basic protection via SMS: server room monitoring with cellular alarm notification

This Didactum bundle combines the Monitoring System 500T with the four most important environmental sensors — temperature, humidity, water, and smoke — as well as an LTE modem with an additional antenna to provide instantly deployable IT basic protection. This makes it possible to monitor server rooms and technical areas around the clock and deliver alarms by SMS even if the network fails.

As a highly advanced 19"-1U control unit, the Monitoring System 500T serves as the central monitoring point of the bundle: it is connected to the network via Gigabit Ethernet, is fully configurable through the web browser, and requires no additional software. The temperature, humidity, water, and smoke sensors are connected directly to the analog ports and detected automatically. The LTE modem installed in the expansion slot of the 500T ensures that alarm messages are reliably transmitted via mobile network even if the local network connection fails.

As your needs grow, this bundle grows with them: additional sensors and CAN devices can be added at any time via the remaining analog ports and the CAN bus of the 500T — without replacing the central unit.

This bundle includes:

Six coordinated Didactum products that together form complete IT basic protection with cellular backup.

Monitoring System 500T

The Monitoring System 500T is the central control unit of the bundle and a highly advanced, field-tested 19"-1U monitoring solution for data centers, server rooms, and other business-critical environments. As a self-sufficient device without moving parts such as fans or hard drives, it continuously records all connected sensors and generates real-time alerts long before a costly outage can occur. With 8 analog ports, a CAN bus port, 16 potential-free inputs, and 4 relay outputs, the 500T can also be used as an I/O controller for doors, fans, generators, or UPS systems. The system is equipped with Gigabit Ethernet (10/100/1000 Mbit/s) and can be seamlessly integrated into monitoring environments such as Zabbix, PRTG, or Nagios thanks to SNMP, Modbus TCP/IP, and Syslog.

Temperature sensor

The Didactum temperature sensor is used for precise temperature monitoring and measurement in server rooms and technical environments. The sensor is connected via an RJ11 plug to an analog port of the 500T and detected automatically. It can then be freely named in the web interface and assigned custom thresholds (Lower Critical, Lower Warning, Normal, Upper Warning, Upper Critical), so that an alarm is triggered automatically when the temperature becomes critical.

Humidity sensor

The Didactum humidity sensor measures relative humidity in the server room and provides early warning of air that is too dry (ESD risk for hardware) or too humid (risk of condensation). Like the temperature sensor, it is connected via an RJ11/RJ12 cable to an analog port of the 500T, automatically detected, and configured in the web interface with individual thresholds.

Water sensor

The Didactum water sensor detects leaks by measuring an increase in capacitance between two metal poles — corrosion-resistant and ideal for long-term use under raised floors, near air conditioning systems, or close to UPS batteries. The sensor is connected via an analog port of the 500T and typically reports water ingress within about 15 seconds.

Smoke sensor

The Didactum smoke sensor is a photoelectric smoke detector for early fire detection in server rooms and technical areas. It is connected to an analog port of the 500T, mounted on the ceiling (max. 6 m installation height), and can be daisy-chained with up to 10 additional smoke sensors if required to cover larger rooms.

LTE modem with additional antenna

The LTE modem is already factory-installed in the designated expansion slot of the Monitoring System 500T and ensures maximum fail-safe reliability for IT basic protection. If the local network connection fails, the modem automatically switches to LTE (4G) and maintains system communication, so alarms from the temperature, humidity, water, and smoke sensors are still reliably transmitted even when the LAN is unavailable. In addition, the module supports sending and receiving SMS notifications to up to ten different phone numbers, which significantly increases the response speed for critical messages.

Comprehensive sensor integration for the bundle

The Monitoring System 500T supports up to 130 sensors, contacts, and relays simultaneously — 8 analog RJ12 sensor ports are available directly on the device, and the CAN bus can extend this number significantly. Four of the eight analog ports are already occupied in the bundle by temperature, humidity, water, and smoke sensors; the remaining four ports stay free for additional sensors.

Thanks to the four remaining analog ports and the CAN bus port, the bundle can be expanded at any time with additional environmental and security sensors — the IT basic protection forms the basis for comprehensive server room monitoring.

Real-time monitoring and automated alerting

The Monitoring System 500T responds immediately to every state change of the connected sensors. If a threshold is exceeded, the system automatically sends email notifications, SMS, web-to-SMS, PUSH messages, or SNMP traps, or activates a siren. If the local network connection fails, the factory-installed LTE modem automatically takes over communication and ensures that alarms and SMS notifications continue to be delivered reliably. Integration into monitoring software such as Zabbix, PRTG, or Nagios is easily possible thanks to common network protocols (HTTP, HTTPS, SMTP, FTP, SNMP, Syslog, DHCP, Modbus TCP/IP).

Web-based control & intelligent automation

The intuitive web interface makes it easy to manage all sensors as well as alarms and scenarios — right from the moment the bundle is put into operation.

• Temperature > 28 °C AND humidity < 30 % → activate fan, ramp up air conditioning, send email
• Water sensor triggered → activate pump, trigger siren, SMS to technicians
• Smoke sensor triggered → switch off power supply, send SNMP trap, SMS to control center
• Network failure detected → automatic switch to LTE, SMS confirmation

The Monitoring System 500T can be used as an I/O controller for air conditioning, UPS, generators, lighting, doors, or fans — ideal for data center management, building automation, and preventive maintenance.

Full control

Monitor all sensors, turn them into actionable alarms, and configure integrations — all through an intuitive web-based interface.

• Monitor real-time status of temperature, humidity, water, and smoke together
• Create automated actions based on defined conditions
• Send email, Telegram, HTTP request, SNMP, or other notifications
• Visualize trends and logs for better decision-making
• Manage users, permissions, and access securely

Scalable, reliable, and future-proof

The Monitoring System 500T in the bundle is equipped with 10/100/1000 Mbit/s Ethernet (Gigabit). The system supports up to 1000 elements (sensors, contacts, triggers, timers, logic schemes, notifications). Four of the 8 analog ports of the central unit are already occupied by sensors in the bundle; the remaining 4 ports and the CAN bus port remain fully available for additional sensors. Regular firmware updates ensure long-term use. Made in the EU — German support included.

Connect CAN devices

The Monitoring System 500T has a CAN bus port to which up to 32 additional CAN devices can be connected — for example additional sensor expansion units (8 analog ports per unit) or dry-contact expansions for potential-free contacts. The total length of the CAN bus line can be up to 225 m, allowing larger infrastructures to be monitored centrally. An additional CAN power supply (12V/1A) is only required if the number of CAN devices in the chain exceeds 12 units.

Commissioning in just a few minutes

Setup of the bundle is quick and easy — with no additional software required.

1. Mount the Monitoring System 500T in the 19" rack and connect it to your network using a Gigabit Ethernet cable
2. Connect the appropriate power supply — the system starts automatically
3. Open the device’s default IP address in the browser as listed in the quick guide and run through the setup wizard
4. Connect the temperature, humidity, water, and smoke sensors to an analog port each — automatic detection
5. Insert your own SIM card into the already factory-installed LTE modem and activate it in the web interface
6. Name each sensor in the web interface, define thresholds, and configure alarm rules

What is included in the delivery

Please check the contents for completeness upon receipt and report any missing or damaged items to your supplier immediately.

• Didactum 500T monitoring unit1 piece
• OTG USB-C cable1 piece
• UTP Ethernet cable, 3 m1 piece
• Micro USB-C OTG adapter cable1 piece
• 19" rack brackets2 pieces
• M3 × 8 mm Phillips pan-head screws6 pieces
• Connection terminal, 6-pin, 5.08 mm1 piece
• Connection terminal, 3-pin, 3.81 mm1 piece
• Connection terminal, 6-pin, 3.5 mm4 pieces
• Connector plug, 2-pin, 3.81 mm15 pieces
• Self-adhesive rubber feet4 pieces
• Quick guide1 piece
• Temperature sensor incl. 2 m RJ11 cable & mounting material1 piece
• Humidity sensor incl. 2 m connection cable & mounting material1 piece
• Water sensor incl. connection cable & mounting bracket1 piece
• Smoke sensor incl. connection cable & ceiling mount1 piece
• LTE modem with additional antenna1 piece

A SIM card for the LTE modem is not included and must be purchased separately.

Why this bundle is the right choice

Practical application examples

• Basic monitoring of server rooms and small technical rooms
• Early detection of overheating, condensation, water ingress, and smoke development
• Remote monitoring of branch offices or remote sites without stable Internet access thanks to LTE
• Backup communication for critical networks in data centers, hospitals, or public authorities
• Audit-ready event logging for audits and compliance
• Ideal as an entry-level solution with expansion options via CAN bus and free analog ports

This bundle of Monitoring System 500T, temperature, humidity, water, and smoke sensors, plus LTE modem combines central environmental monitoring with fail-safe cellular backup communication — for reliable IT basic protection that also alerts by SMS during network outages.

More about the bundle

Frequently asked questions