Page 18
DCP-555 Installation Guide
Using the General Purpose Outputs (GPO)
Using the General Purpose Outputs
(GPO)
These outputs are known as “General Purpose Outputs” or “GPO”� There are 6 digital logic control outputs for
controlling LEDs and 2 relay outputs for controlling external devices� GPO connections are made using the
included black 12-pin terminal-block connectors (HARMAN part number: 32-1006)�
The GPO logic outputs can source 10mA at 5VDC, or sink up to
50mA of current as an open collector output�
For higher-current reed-type relays you must use one of the GPO
logic outputs to sink current using an external power supply�
LED Indication
When sourcing from a logic output, an LED connected between one output (Anode, A) and common (Cathode,
K) will illuminate when the logic output is activated, without requiring any external current limiting resistor
(the DCP-555 contains an internal 300Ω resistor)�
Anode (+)
Cathode (-)
Current Source:
10mA Max
LED
Port1
CurrentSink:50mAMax
ExternalSupply
VCC
