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Mini-AT User Guide
Access Levels for Operating Personnel
There are four levels of instrument access available on the Mini-AT for operating personnel. The first
level, referred to as the Corrector Mode, displays the corrected volume on the LCD and the uncorrected
volume on the digital mechanical index. The Corrector Mode also provides a visual indication for
instruments in an alarm condition.
The second level available is referred to as the Meter Reader Mode. Meter readers can use a magnetic
wand to scroll the values of specific items on the LCD. Uncorrected and corrected volumes, a limited
number of pre-specified values, such as; gas pressure gas temperature, battery voltage, and any alarms
that may be activated, can be part of the meter reader list. The meter reader cannot make any changes
that will effect the configuration of the Mini-AT.
The third level of access available is called: Level 1 Access Mode. This level of access requires an IBM
compatible computer, MasterLink32 or Mini-AT Link software, an interface cable and the Level 1 Access
Code. After the computer is connected and Level 1 Access has been gained, the operator can perform field
calibration checks and make adjustments if necessary. Additionally, clearing alarms, performing certain
diagnostic functions and changing the configuration of authorized items are possible. To insure data integrity, the
serial communications protocol incorporates data error checking.
Access at the fourth level is reserved for the instrument technician and is referred to as Level 2 Access
Mode. Access to this level requires an IBM compatible computer, Mini-AT Link software, an interface
cable and the Level 2 Access Code. After the computer is connected and Level 2 Access is gained, the
instrument technician can reconfigure Mini-AT parameters. Any and all item code values may be
changed, including Level 1, Level 2 and the Instrument Access Codes. The Authorization Table may
also be modified, which will control what item values may be changed during Level 1 Access. To insure
data integrity, the serial communications protocol incorporates data error checking.
Note: Level 1 and Level 2 Access are computer software functions only. Even after gaining Level 1 or
Level 2 Access, changes to the instrument's configuration are not possible until a valid Instrument Access
Code is entered. After a serial link is obtained, Audit Trail, Event Log and Alarm Log downloads are
also possible.
The Mini-AT continues to recognize meter input pulses while in the Meter Read, Level-1, and Level-2 Modes.
Upon exiting any serial link access, the Mini-AT will perform a Full Wake-up just before returning to the
Corrector Mode. Following a meter reader access, the instrument will return to the Corrector Mode;
a) without a wake-up, if there were no meter rotations during the
meter reader access.
b) after an intermediate wake-up with any number of meter rotations
and N greater than one.
c) after a full wake-up with any number of meter rotations and N
equal to one.
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