CAN Sensors / Modules
CAN sensors can be connected to any CAN port or CN1/CN2 of the monitoring system using the supplied CAN FTP cable. CAN sensors can be connected in series. The module or connection is selected via the web interface.
Connection of CAN sensors and CAN devices
Connect CAN devices to any CAN1 or CAN2 port of the monitoring system using the supplied cable. CAN sensors can also be connected to the port of another CAN sensor or CAN device connected to the CAN bus. Device detection and connection are performed via the web interface.
- You can connect a maximum of 12 CAN sensors and CAN devices to one CAN bus (approximately).
- If you want to connect more than 12 CAN devices, you will need the CAN 12V 1A power supply.
- You can connect up to 32 CAN devices in a single CAN bus chain.
CAN cable and limited cable length
The maximum CAN cable length in Didactum monitoring systems is 225 m.
This is due to the limited resistance of cables with RJ12 connectors. Didactum AWG24 cables have a low resistance.
Since the conductivity of aluminum is significantly lower than that of copper, the resistance of CCA cables is considerably higher than that of pure copper cables of the same size. It is recommended to use two or three wire pairs, such as UTP Cat3.5.6 with 24 AWG and a copper core. While the use of 4- or 6-core TRONIC or UTP-CCA cables is possible, it reduces the maximum CAN cable length.
This procedure applies to the following sensors that are supported by the monitoring system and are located on the CAN port:
CAN Sensors:
- Smoke, temperature, and humidity sensor
- CAN sensor for temperature, humidity, and pressure
- Combined temperature and humidity sensor
CAN Modules:
- Analog sensor expansion unit
- Dry contact expansion unit for power-free fault detectors
Linkable connection of Didactum sensors: door contact, vibration detector (linkable) and smoke sensor
Didactum vibration detectors (daisy-chainable) and smoke detectors are the only analog sensors that can be connected in series. All sensors in a chain are treated as a single sensor by the system. Up to 10 sensors can be connected in series.
See an example of such a series connection here: