Ross Opengear UDC-8625A Series, User Manual, Page: 37 / 174

UDC-8625A Series User Manual (Iss. 11) Installation • 2–17
GPIO Cabling
The UDC-8625A series provides up to eight General Purpose Input (GPI) and Tally pins to
interface with external equipment. The number of GPI/Tallies available depends on the rear
module type and the card model you are using.
The GPI ports are available on 3-pin connectors located on the rear module. The 3-pin mating
connectors are provided with the rear module.
The default state for the GPI/O contacts is active low signaling. This way, if the card is removed
from the openGear frame, no external events will be inadvertently asserted by the card. This also
means that if a GPI cable is absent from the rear module, no GPI or Tally will be triggered and
executed inadvertently by the card.
Ports are user programmable to be either an input (GPI) or an output (Tally). Electrically, the
ports are set up for contact closure to ground, with 4.75Kohm pull-up resistor to +5V, so they
default to a logical high state.
For More Information on...
• configuring GPIs and Tallies, refer to the section “ Setting up GPI/Tally
Communications ” on page 3-7.
8310AR-033 Rear Module
The 8310AR-033 rear module provides eight GPI and Tally pins to interface with external
equipment. (
Figure 2.15 )
Figure 2.15 8310AR-033 GPIO Connections
Note
—The 8320AR-041 rear module does not include GPIO ports.
GPIO 2 GPIO 1
GND
GPIO 4 GPIO 3
GND
GPIO 6 GPIO 5
GND
GPIO 8 GPIO 7
GND