Commissioning
Instruction manual 854 ATG Page 15
Protection level 1
Access to items which are not directly measurement related, such as high level alarm (HA), tank identifier
(TI), etc. is protected by password 1 (W1). It is possible to modify these data only after entering the correct
level 1 password W1=XXXXXX, where XXXXXX is the level 1 password.
Password W1 itself can be read protected by means of jumper J(A)1 on the XPU(-2) board.
Protection level 2
All NOVRAM items which affect the (remote) level reading, such as reference level (RL), transmission
address (TA), etc. are protected by password 2 (W2). It is possible to modify these data only after entering
the correct level 2 password W2=XXXXXX, where XXXXXX is the level 2 password. Additional measurement
related items, such as temperature items, can also be protected by password 2.
Password W2 itself can be read protected by means of jumper J(A)2 on the XPU(-2) board.
In protection level 2, the items which reside under protection level 1 can also be modified.
W&M protection
I
tems under protection level 2 can also be protected by jumper J(A)3 on the XPU(-2) board. If this jumper is
placed in position 1, the write access is completely disabled. Also issuing the correct level 2 password will not
work.
The table below gives an overview of the XPU(-2) jumper functions (refer also to figure 3.6).
Jumper (XPU / XPU-2)
Function
Position “0”
Position “1”
JA1 / J1
read password 1
not protected
protected
JA2 / J2
read password 2
not protected
protected
JA3 / J3
W&M protection
not protected
protected
JA4
NOVRAM initialising
active
not active
JA5 - JA7 / J4 - J6
spare
Figure 3.6 Jumpers on XPU and XPU-2 board
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