Logic Examples; Logic Input; Contact Closure; Logic Output - Polycom SoundStructure C16 Hardware Installation Manual

Logic Examples

Logic Input

Contact Closure

When the contact is closed, the logic input pin (Pin 14 in the example below) is driven low (0 or off). When
the switch is open, the logic input pin will float high (1 or on).
Typical applications may be push to mute or push to talk buttons or room combining for changing the device
settings based on the room configuration.
Contact Closure
Remote Control

Logic Output

SoundStructure Powered Relay

Relays rated for +5 V or lower may be driven directly from the +5 V logic connector pin 1 supply. Relays
rated for more than +5 V will need an external power supply as described in the next example.
When the logic output (Pin 2 in this example) is set on (1 or high), current flows from Pin 2 to ground and
current that flows will energize the relay coil and close the relay contact. When the logic output is set off (0
or low), current will stop flowing to the relay coil, causing the relay contact to open. A diode is recommended
to be placed in parallel with the relay to provide a path for the discharge current of the magnetic coil of the
relay. This current will discharge over a very short period of time and a diode capable of handling a large
amount of surge current such as the 1N4001 is recommended and is available from several manufacturers.
Polycom, Inc.
Pin 14 : Logic Input 1
Pin 25 : Ground
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