XLINK 500/100 Operations & Maintenance Manual page # 68
7.2.1.
Password Protection Setting
A setting called Password Protection needs to be set in order to secure a station. Password
Protection may be set to one of the following:
DISABLED
In this scenario, full access is allowed without a password. This is the default.
SETUP
In this scenario, the system
’s setup
is write-protected. Maintenance and read
access are allowed without a password.
Without providing the correct password:
The Station setup cannot be changed. Transmissions may not be started.
Status may be cleared, measurements may be calibrated and forced, failsafe
may be reset, unit may be rebooted, clock may be set.
MAINTENANCE
System write, and maintenance operations are restricted. Read access is allowed
without a password.
Without a password, setup can be read, but not written; status can be checked, but
not cleared.
FULL
System is fully protected.
No access at all is allowed without a password, except for the following commands:
EXIT, HELLO, PASSWORD PROTECTION, VER.
Password Protection must be enabled when connected locally to the station. It may not be
enabled nor disabled when connected remotely.
If a station is deployed with password protection disabled, the only way to enable
protection is locally. Remote access cannot be used to enable protection. Why? To
prevent hackers from locking out an unprotected station.
If a station is deployed with protection enabled, allowed actions depend on the
Remote
Password Change
setting:
If it is On, password protection may not be completely disabled remotely. The
Password Protection
setting may be modified to be
Setup, Maintenance, or Full,
but
it may not be
Disabled.
If It is Off,
Password Protection
may not be modified at all remotely.
7.2.2.
Passwords
XLink has three different passwords. The access level granted depends on the password
provided.
Read password
Read access is the most restricted access level. A customer with read access may
not make any changes to the system. Read access allows one to view measurement
readings, view status, view setup, download the log, and the like.
Maintenance password
Entering the maintenance password provides everything that read access does, plus
the ability to calibrate sensors, clear status, reboot unit, and other station
maintenance related functions.
Setup password
Entering the setup password grants complete access to the station.