Clear-Com HX System Frames - Manual (Page 48)

Each general-purpose output has a relay inside the Eclipse HX-Delta matrix.
When a general-purpose output is inactive, the associated common pin on
the GP OUT connector will be shorted to the relevant normally closed pin.
When a general-purpose output becomes active, the short between the
common pin is broken and a new connection is made between the
common pin and the normally open pin.
Figure 16: Pin configuration of the GPO connector
E
General-Purpose Inputs Connector (GP IN)
The DB-25 connector labeled GP IN connects the matrix to eight local
general-purpose inputs (GPIs).
An external device such as a foot switch, a panel-mounted switch or the
logic output of some other device can be connected to the GP IN connector.
When the external device is activated, it sends a control signal into the
matrix to perform one of several preset functions, such as turning a user
panel’s microphone on or off, muting a microphone’s output, or turning a
panel’s speaker off. The function to perform and the panel upon which it is
performed is configured using EHX.
A shielded cable should be used.
48 Eclipse HX-Delta User Guide