Additional specifications and description
How does it work?
Sentera devices communicate with each other via Modbus RTU communication. Modbus RTU is a serial communication protocol that uses RS485 technology. Some applications require communication with non-Sentera products - for example a damper actuator, an EC fan, etc. These non-Sentera products can be connected via this DDACM-I3 module. They can receive commands via the 3 analogue outputs of this module. The output types can be selected: 0-10 VDC / 0-20 mA / 0-100% PWM. These outputs are galvanically separated from the Modbus RTU input.
Modbus RTU controlled
The analogue outputs can be controlled via 3 Modbus registers. A Modbus master device is required to write the correct value in the Modbus registers of the DDACM-I3 module and to control its analogue outputs. The master controls the outputs by writing a value in Modbus Holding registers12,16 and 20. The three LED indicators provide a status indication of the outputs. During normal operation and an output value > 0, the LED is green. When the output is 0, the LED is yellow. In case of a problem (hardware or Modbus related), the LED is red.
DIN rail mounting
This Modbus RTU IO module can be mounted on a DIN rail. Modbus RTU communication and the 24 VDC supply voltage for this module are connected via the RJ45 socket. To facilitate wiring, we recommend to use the Sentera 24 VDC power supplies with RJ45 connector. The enclosure offers an IP30 protection against ingress of dust and moisture.