Clear-Com V12PDDXY - Manual (Page 144)

Note:
The Relay 1 and 2 outputs on the GPIO connector are referred to in ECS / EHX Controls as Panel
mute relays and Panel AUX relays respectively.
7.2.12 Programmable Relay contacts
Each panel includes two relays which are:
• Controlled by the matrix.
• Independent of the local panel function.
These relays can be assigned to any label(s) in the system, which will activate whenever a
talk or listen is set to that label(s).
Tip: If you simply wish to trigger a relay, assign the relay to a control label. For more
information, see your ECS / EHX documentation.
The relay can activate an external device, such as an applause light in a studio, a cue light,
or a security door lock. Any programmable relay in the system can be activated from any
panel in the system, including a direct-inward-access caller.
Figure 172: GPIO connector pinout shows the wiring of the relay contacts to the GPIO
connector.
Both normally open and normally closed contacts are provided. They are rated at 1 Amp at
24 V DC. This relay is not designed for switching mains AC line voltage. To switch an
external device running on mains AC line voltage, use an external relay (or other switching
mechanism) activated by this relay.
7.2.13 Opto-Isolated inputs
Each main panel provides four opto-isolated inputs using the GPIO interface.
Each input consists of a pair of pins on the GPIO with an operating range of 4V to 30V DC or
AC. These inputs can be used for user programmable functions set up by ECS / EHX to
execute other actions within the system such as switching a microphone on or off.
Input 3 (pins A3/B3) is preassigned in ECS to trigger the Reply Key function while inputs 1
and 2 (pins A1/B1 and A2/B2) are available for assignment in ECS / EHX in
Advanced Settings > Logic Inputs.
Input 4 (pins A4/B4) is not currently used.
The inputs are operated by applying a voltage between 4V and 30V DC or AC across the
pins so that a current flows through the circuit and is detected by the opto-coupler.
The voltage may be derived from the panel itself using the 5V and 0V pins on the GPIO or it
may be from an external source. An example is a circuit using a footswitch to activate the
panel microphone using logic input 1.
144 V-Series Panels User Guide