ADLINK PCI-7258 - Manual (Page 18)

10 • Getting Started
2.4 External LED
Figure 2: PCI-7258 External LED connector
The PCI-7258 card is designed with 32 LEDs, each indicating the operation
status of the 32 relays. In addition, there are also 32 external LED connectors
available for users’ to use as so pleases. Utilizing the external LEDs
connecting to JP1 or JP2, users can have a visual status of each relay
displayed on a chassis, panel or on any apparatus. Only LED’s with a
forward voltage (V
f
) lower than 2V will operate. Each external LED connector
has a current limiting resistor (330Ω) connected to the +5V supply, therefore
external current limiting circuitry for external LED’s are not necessary.
The direction of the external LED’s connection is shown in Figure 2. Before
connecting a LED to a connector, make sure the LED’s orientation is correct.
A K
JP1
LED1
LED10
LED16
A K
JP2
LED17
LED26
LED32