HP A3550A - High Availability Disk Arrays Model 20 Storage Enclosure User Manual page 127

Identify Available MUX Ports
Connect the Disk Array to a MUX Port
Configure the MUX Ports on the Host System
Note There are port restrictions on certain computers. If using a J2085A and the MDP port
of a CPU, ports 0, 1, and 7 are reserved on a K-Series CPU.
cd /etc/uucp
cp Devices Devices.old
vi Devices
Direct tty0p1 - 9600 direct
Direct tty0p2 - 9600 direct
cd /etc
cp passwd passwd.old
vi passwd
(
Make the RS-232C Connection to the Host System 3-15