Control Output Terminal Strip - PRICOM Design Layout Lighting Solution User Manual

3.7 Control Output Terminal Strip

The Layout Lighting Solution is capable of controlling many types of devices and loads
connected to the Control Outputs. This section describes the electrical connections for the
Control Outputs.
The Control Outputs of the Layout Lighting Main Board are not isolated in any way from
the Ground of the system. If grounding problems become an issue for your application,
an external relay can be used to isolate the load from the Layout Lighting Solution.
As a convenience to your wiring, you may use the power supplied on the Control Output
Terminal Strip, but doing so will draw power from the internal 5V regulated supply used
to power the Layout Lighting Main Board. Use this convenience power for LED's, or
small relays. If you intend to power any larger loads, please consider an external power
source for the Control Outputs.
Figure 9 – Control Output Terminal Strip Pinout (P2)
Terminal Name
1 GND
2 Output-1
3 Output-2
4 Output-3
5 Output-4
6 Clamp
7 5V
The control output terminals (Output-1 to Output-4) provide connection to a Darlington
Transistor Array (Collector) used to Sink Power, but cannot Supply Power. Each Output
is capable of sinking 400MA using the ULN2803 in the socket at U2. The Darlington
Array has its Emitters connected to the GND Terminal #1. External or Convenience
power can be used to power the load, but the reference and current ground will be using
GND Terminal #1.
Terminal #6 (Clamp) is connected to the Darlington Array protection diodes (Cathode)
for all 4 outputs. If you are driving an inductive load such as a relay, the Clamp terminal
should be connected to the power source being used for the load. This Clamp Terminal
will prevent the back-lash of the relay from destroying the Darlington Array. If you are
simply driving LED's this terminal can be left un-connected.
Terminal #7 provides a local power source that is not isolated from the Layout Lighting
Main Board, but can be used to simplify wiring if just powering LED's or other small
loads. Power used from this terminal can cause the on-board voltage regulator to become
hot under load.
Page 13
Description
Convenience power supply ground
Control Output #1
Control Output #2
Control Output #3
Control Output #4
Common Clamp Diode Connection
Convenience power supply (5VDC)
Layout Lighting Solution – User Manual
Layout Lighting Solution – Connections