Jumper Setting

When using the CAN-bus ports of Didactum monitoring systems 500/500 DC / 600 the jumpers must be set to the terminator on the main unit (TERM) to "ON"


On the main units and the CAN extension units of the Didactum appliance you will find the name "TERM" a DIP switch with two switches. Principle: The Terminator jumper is always one of the two switches, which is located to the CAN-bus ports closest.


The last contained in the serial CAN-bus chain CAN bus device (CAN or CAN-sensor unit) must always be terminated. Therefore, set the terminator to "ON".


Before setting the terminator switch the corresponding Didactum CAN-bus device must be unplugged from the power supply or cable connection.

Terminator Settings for the CAN-Didactum Units

The figure below applies to the following Didactum CAN-Bus devices:

Didactum Rack Control Unit

Didactum Sensor Unit

Didactum Airflow and temperature unit 

Terminator Settings for the CAN-Didactum Units
To terminate the CAN unit, the right switch of the DIP switches is folded down. By default setting, the Didactum CAN units are not terminated (right graph).

Didactum Dry Contact Unit

For the Didactum Dry Contact Unit following Terminator setting is:  

Didactum Smoke, Humidity and Temperature Sensor
Left you can see the factory setting "Off" of the CAN bus terminator in the right graph scheduling to "On" is set by switching the left DIP switch.

Didactum Smoke, Humidity and Temperature Sensor

For the Didactum Smoke, Humidity and Temperature Sensor applies:

Didactum Smoke, Humidity and Temperature Sensor
Default, this combined CAN sensor is not terminated. In the right graph the scheduling of the CAN-sensor is switched to converting the jumper.

Didactum PIR, Vibration and Temperature Sensor

For the combined Didactum PIR, Vibration and Temperature Sensor, the jumper needs to be set for termination as follows:

Didactum PIR, Vibration and Temperature Sensor
Factory scheduling this combined CAN sensor is disabled. In the right picture you can see how the jumpers must be set for the termination is.