DATOptic ARC-1680 Series - Manual (Page 37)

HARDWARE INSTALLATION
37
Figure 2-20, Activity/Fault LED I 2 C connector connected between
SAS RAID Controller & 4 SATA HDD backplane.
B: I 2 C Connector
You can also connect the I 2 C interface to a proprietary SAS/SATA
backplane enclosure. This can reduce the number of activity LED
and/or fault LED cables. The I 2 C interface can also cascade to
another SAS/SATA backplane enclosure for the additional channel
status display.
PIN Description PIN Description
1 Power (+5V) 2 GND
3 LCD Module Interrupt 4 Protect Key
5 LCD Module Serial Data 6 Fault/Activity Clock
7 Fault/Activity Serial Data 8 LCD Module Clock
The following picture and table is the I 2 C signal name description
for LCD & fault/activity LED.