Clear-Com HX System Frames - Manual (Page 32)

Pin 20 Common
RELAY7
Pin 21 Normally closed
Pin 22 Normally open
Pin 23 Common
RELAY8
Pin 24 Normally closed
Pin 25 Normally open
Table 7: Pin configuration of the GPO connector (DB-25M)
Note:
See also Figure 7: Pin configuration of the GPO connector (DB-25M) .
4.5.5 Connections using General-Purpose Inputs (GPIs)
The DB-25 connector labeled GP IN connects the matrix to eight local general-purpose inputs
(GPIs).
An external logic device (such as an external 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 logic device is activated, it sends a control signal into the matrix to perform
one of several preset functions, such as turning an intercom 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 programmed from the EHX software.
A shielded cable should be used.
Non-isolated mode
When delivered from the factory, the general purpose inputs (GPIs) operate in non-isolated
mode. Non-isolated mode does not require that the externally connected equipment powers the
general-purpose input. The current is supplied by a voltage output on the GP IN connector.
Figure 8: Non-isolated connection to an Eclipse HX-PiCo GPI connector
32 Eclipse HX-PiCo User Guide