- Varec Radar Tank Gauge Model 7532 RTG Installation & Operations Manual

37
7532 Operation
5.3 Local operation
5.3.1 Locking of the configuration mode
The 7500 RTG can be protected in two ways against unauthorized changing of instru-
ment data, numerical values or factory settings:
"unlock parameter" (0A4):
A value <> 100 (e.g. 99) must be entered in "unlock parameter" (0A4) in the
"diagnostics" (0A) function group. The lock is shown on the display by the
symbol and
can be released again either via the display or by communication.
Hardware lock:
The instrument is locked by pressing the
O and S and F keys at the same time.
The lock is shown on the display by the
symbol and can only be unlocked again
via the display by pressing the O and S and F keys at the same time again. It is not
possible to unlock the hardware by communication.
All parameters can de displayed even if the instrument is locked.
⇒
⇓
O and S and F press simultaneous
⇓
The LOCK_SYMBOL appears on the LCD.
E
+
–