©Sealevel Systems, Inc.
R2 Manual
29
SL9247 2/2017
SERIAL PORT 3 CONFIGURATION
Serial Port 3 is configured as RS485 Half Duplex (2-Wire). Configuration features are found on the 12000
carrier board near the protection fuse via SW1 and J12. See the Serial Port 3 Operation section for detailed
configuration options.
INPUT CURRENT PROTECTION FUSE
The fuse holder located at location F1 is located on the positive power input path of the 12000 carrier
board. To protect the user and the computer system from major system faults, the system is designed to
have the fuse fail if DC current of 30A or greater is present.
The 12000 carrier board uses an automotive style Mini-Blade Fuse (Littlefuse PN 0997030.WXN).
To replace the fuse:
1.
Follow the steps found in the Removal of Core Electronics section above to access the fuse.
2.
Once exposed, grip the fuse and wiggle it back and forth while pulling up until the fuse slides out of
the holder.
3.
Place the blades of the new fuse in the holder and press it straight down into the holder until the
blades are completely hidden by the fuse holder contacts.
Support the circuit board underneath the fuse holder while removing or installing the fuse.
DISK DRIVE REMOVAL
The disk drive can be accessed by completely removing the core electronics from the enclosure. See the
steps above for electronics removal instructions.
Be sure to unplug the power switch cable from the 12000 carrier board before completely
removing the core electronics. Failure to do so could damage the circuit board or switch.
Once the core electronics are removed, see the following steps for drive removal/installation.
