Polycom SoundStructure C8 User Manual

Using Events, Logic, And IR
9 - 17
The pin out of the rear-panel DB25 connectors is shown in the figure.
Logic inputs have a value that is read as either 0 or 1, logic outputs have a
value that is set to either 0 or 1, and the analog gain inputs have a value that
will vary from 0 to 255. The details of how to use logic pins will be described
in the following sections.
Digital Logic Inputs
Logic inputs allow one to connect push to talk buttons and other dry contact
1
closures to the rear-panel of a SoundStructure device. The circuitry behind
each logic input, shown in the following figure, shows that the logic inputs
have a default value of 1 due to the internal pull-up resistor.
REMOTE CONTROL 2
REMOTE CONTROL 1
Pin 25 Pin 14
Pin 1Pin 13
Pin 1Pin 13
Pin 14
Pin 25
Pin Signal
SoundStructure Logic
REMOTE CONTROL 1
REMOTE CONTROL 2
1 +5V
2 Logic output 1
3 Logic output 2
4 Logic output 3
5 Logic output 4
6 Logic output 5
7 Logic output 6
8 Logic output 7
9 Logic output 8
10 Logic output 9
11 Logic output 10
12 Logic output 11
13 Analog gain input 1
Pin Signal
14 Logic input 1
15 Logic input 2
16 Logic input 3
17 Logic input 4
18 Logic input 5
19 Logic input 6
20 Logic input 7
21 Logic input 8
22 Logic input 9
23 Logic input 10
24 Logic input 11
25 Ground
1 +5V
2 Logic output 12
3 Logic output 13
4 Logic output 14
5 Logic output 15
6 Logic output 16
7 Logic output 17
8 Logic output 18
9 Logic output 19
10 Logic output 20
11 Logic output 21
12 Logic output 22
13 Analog gain input 2
14 Logic input 12
15 Logic input 13
16 Logic input 14
17 Logic input 15
18 Logic input 16
19 Logic input 17
20 Logic input 18
21 Logic input 19
22 Logic input 20
23 Logic input 21
24 Logic input 22
25 Ground
1
A dry contact closure is one where there is no voltage externally applied to the con-
tacts – it is simply an open or closed circuit.

Polycom SoundStructure C8 Specifications

General

Brand	Polycom
Model	SoundStructure C8
Category	Conference System
Language	English