Trigger Input Terminal Strip - PRICOM Design Dream Player MK2 User Manual

3.3 Trigger Input Terminal Strip

More than simply playing a sound file, your Dream Player is capable of acting and
reacting based on input from you or the devices it is controlling. This section describes
the electrical connections for the Trigger Inputs. Section-3 entitled "Using the Dream
Player" describes the operational functions and events that are controlled by the Trigger
Inputs.
The Trigger Inputs of the Dream Player are optically isolated which means you can wire
the inputs so that they are electrically isolated from the Dream Player. Why is that
important? Because sharing a common ground between an Audio Playback system and
any other system can, and usually does, create ground loops and noises such as „buzz‟
and „hum‟. By isolating the Trigger Inputs, we have removed this problem for you!
As a convenience to your wiring, you may use the power supplied on the Trigger Input
Terminal Strip, but doing so will defeat the isolation offered by the Dream Player. If you
are simply wiring switches or buttons, there isn‟t much chance of a „ground loop‟ or
„noise‟, so we give you the best of both worlds.
Terminal Name
The trigger input terminals (Trigger-1 to Trigger-4) provide connection to the low-side
(Cathode) of the LED in each opto-isolator. Current limiting resistors are built-in, so you
can simply connect any Trigger Input to GND to cause the Trigger to occur.
Terminal #6 (POS) is connected to the high-side (Anode) of all 4 opto-isolators.
Typically Terminal #6 is connected to the power source to be used to trigger the inputs.
This can be an external power source or Terminal #7 (5V), if you do not need to isolate
the Dream Player ground. The internal current limit resistors are suitable for voltages
from 5VDC up to 24VDC. If higher voltages are required please contact us to determine
suitable added current limit resistors.
Terminal #1 and Terminal #7 provide a local power source that is not isolated from the
Dream Player, but can be used to simplify wiring if just using push-buttons, relays, or
other input that doesn‟t require optical isolation.
Page 9
Figure 1 – Trigger Input Terminal Strip Pinout (P4)
Description
1 GND Convenience power supply ground
2 Trigger-1 Opto-Isolated Trigger #1 Input
3 Trigger-2 Opto-Isolated Trigger #2 Input
4 Trigger-3 Opto-Isolated Trigger #3 Input
5 Trigger-4 Opto-Isolated Trigger #4 Input
6 POS Opto-Isolator Shared Power Input
7 5V Convenience power supply (5VDC)
Dream Player MK2 – User Manual
Using your Dream PlayerMK2