Areca ARC-1280ML - Page 42

HARDWARE INSTALLATION
42
Step 6 Install the LED cable (optional)
ARC-1XXX Series Fault/Activity Header Intelligent Electronics
Schematic
The intelligent LED controller outputs a low-level pulse to deter-
mine if status LEDs are attached to pin sets 1 and 2. This allows
automatic controller conguration of the LED output. If the logical
level is different between the st 2 sets of the HDD LED header
(LED attached to Set 1 but not Set 2), the controller will assign the
rst HDD LED header as the global indicator connector. Otherwise,
each LED output will show only individual drive status.
The SATA RAID controller provides three kinds of LED status con-
nectors.
A: Global indicator connector, which lights when any drive is ac-
tive.
B: Individual LED indicator connector, for each drive channel.
C: I
2
C connector, for SATA proprietary backplane enclosure.
D: SGPIO connector for SAS Backplane enclosure
The following diagrams and description describes each type of con-
nector.