58
Communication & Verification
DENT Instruments
PowerScout HD
Access Restriction Limitations
If security levels have been set up in the meter, no data is accessible through the LCD user interface or
PSHD Web App without entering the PIN credentials. Note, however, that protocols such as Modbus do
NOT SUPPORT ANY LEVEL of security such that any network traffic acting as a master can retrieve and
write data from the registers. Generally, this will require knowledge of the IP address or slave ID and the
register list which discourages casual intrusion.
Security PIN Protection
PSHD meters have two levels of PIN protection that users can choose to assign for restricting access to
meter information. The PIN logic is described in the figure below. The
default
user entry (on power up
or time-out) is
0000
which satisfies
both
the Read Only and the Read / Write default register settings.
U
SING THE
P
ERMISSION
R
EGISTERS
The PSHD meter uses both a “Read Only” register and a “Read / Write” register to compare against user
entrees from the meter’s keypad or PSHD Web App form entry. Both internal permission registers have
a default value of [0000]. A consequence of this is that both PIN registers need to be configured (i.e.
changed from defaults) to implement a read only PIN. Otherwise, a situation may occur where a user
intends to restrict access to “Read Only” by setting only this PIN unaware of the fact that the default PIN
still matches the criteria for “Read / Write” which will accidentally promote the user. ViewPoint HD and
the PSHD Web App disallow this condition, but remote programmers using direct register access may
create this condition.
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