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Page 47
Mini-AT User Guide
A Mercury Modem or Messenger Modem may be installed in the Mini-AT enclosure and share power from
the main battery (see wiring diagram on page 135. Modem operation is supported by a second serial port, TB2.
Modems are generally used to transfer data (audit trail) from a remote location to a host computer. All RS-232
devices require Mercury's Serial Protocol for Mini-AT in the communication driver.
Meter Reader Mode (Detailed Description)
During normal operation, the Mini-AT is operating in the Corrector Mode. To obtain information in addition
to corrected and uncorrected volume, any person with a magnetic wand may access the instrument's Meter
Reader Mode. The Meter Reader Mode provides the ability to display a predetermined number of items on
the LCD display without opening the instrument door. The number of selected items to be viewed can range
from none to eighteen. The selected items may be any of the instrument's item codes.
Upon entering the Meter Reader Mode, any active alarm(s) is always displayed prior to the selected items. When
enabled, the Mag Alarm Acknowledge (item # 128) will permit all alarms to be cleared using the mag wand.
If desired, live gas pressure and live gas temperature may be included as part of the meter reader list. While
displaying live pressure or live temperature, a single point calibration may be performed if a Mercor Mini Field
Calibrator is connected to connector J2 on the main circuit board. The live parameters have a 10 minute time-
out to provide enough time to complete the calibration process.
Gaining Access To Meter Reader Mode
To gain access to the Meter Reader Mode, run the red tip of the magnet activator (mag wand) along the right
side of the Corrected Volume LCD window, see figure 13. Upon entering the Meter Reader Mode, the LCD
will go blank for about 1-second. The transmission of volume pulses is suspended while in this mode. The
instrument takes a pressure and temperature measurement and recalculates all item values prior to an LCD
display.
Numeric Display
Fig. 13
Position of Mag Wand to Activate
Meter Reader Mode
Mag Wand
(Start at top of label and stroke
downward to bottom right
corner)
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