The Trolmaster DSD-1 Dry-contact module provides a simple and flexible solution to users who want to connect to & control devices using the Hydro-X or Aqua-X using a “dry-contact” or relay to activate the device. Many devices require dry contact closure to be controlled or activated. The DSD-1 is the product that you need to control those types of devices. 
*The DSD-1 can be configured to have the same functions as other TrolMaster’s power modules. The DSD-1 connects to the “devices” line on the Hydro-X and can be set to control an almost infinite number and types of devices such as:
Lighting contactors
Light Deprivation curtains
Pump contactors
Temperature devices
Humidity devices
CO2 devices
*By pressing and holding the top button on the DSD-1, users can manually override the module and turn it ON / OFF.
* Consult TrolMaster for questions concerning your particular device.