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Each relay is normally open and can be controlled via software programming. Providing a closure from ground G input pin to any of the input pins provides an input to the Cresnet system. A SIMPL signal, which is driven by a local input, remains high for as long as the closure to ground exists on the corresponding input pin.
When the signal driving a relay goes high, the corresponding relay activates. The relay remains energized as long as its driving signal is high. When the driving signal goes low, the relay is deactivated.
If the data wires from the control system are disconnected, but the CNPCI-8 remains connected to a Crestron power supply and receives 24 volts, the relays of the CNPCI-8 may still be operated from the local control inputs. In this mode, each momentary closure on an input alternatively latches and unlatches the corresponding relay.
All equipment and user interfaces within Cresnet require a unique identity code Net ID. These codes are two-digit hexadecimal numbers from 03 to FE. These position hexadecimal switches can be set to 0 through F.
Using a small screwdriver, rotate the arrow in the center of the switch marked H to point to the first or most-significant digit of the specified Net ID. Set the switch marked L to the second least-significant digit of the specified Net ID. Crestron Electronics, Inc.
Crestron CNPCI-8 Manuals & User Guides
CRESTRON CNPCI-8 PDF
Crestron CNPCI-8 Product Manual