Communications
The Level Plus monitor is available with either EIA 485 or EIA 232 communications hard-
ware for communications with external host equipment. The user can program both baud
rate and communication address parameters.The software also supports a data logger
mode allowing gauge data to be sent to a serial interface printer at scheduled intervals.
Security Password
Programming parameters are protected by a 6-digit security access code. This code may
be reprogrammed or disabled.
Display Units/Resolution
Both MKS and U.S. customary display units are supported. Available level display units
include the following: decimal inches, feet, millimeters, meters or fractional inches.
Available temperature display units include degrees Centigrade or Fahrenheit. These are
global parameters and affect all gauge data.
Level data resolution is also a programmable parameter, but can be different for each
gauge displayed. Level resolutions of 0.1, 0.01 and 0.001 inches can be displayed.
Temperature data resolution is also programmable for each gauge in the system.
Temperature resolutions of 1, 0.2, and 0.02 degrees Fahrenheit can be displayed.
System Clock
The Level Plus monitor maintains system time with on board real time clock (RTC) cir-
cuitry. The RTC uses the power line frequency as a time base offering very high accura-
cy. In the absence of power, the clock automatically switches over to battery power and
a crystal time base. The RTC information (date and time) is printed on all data logger
reports and is also accessible via keypad control.
Gauge Parameters
Programmable gauge parameters include the following items: level data resolution, level
average factor, level offset, temperature function enable/disable, alarm parameters (see
next section) and gauge tag (alphanumeric label). The level data resolution parameter
determines the resolution of the data displayed on the LCD (0.1, 0.01 or 0.001 inches).
The higher the resolution selected, the longer the system scan delays will be. See the
programming section of this manual for additional information about scan delay times.
The level average factor determines how many level readings to average together before
displaying the data. This function can be useful to smooth level changes due to tank agi-
tation or waves. The level offset function is used to calibrate the displayed level data to
the actual measured level in the tank. The level offset value can be directly entered from
the keypad or calculated by the system from data acquired from the DDA Tank gauge.
The temperature enable/disable function allows temperature scans to be enabled or dis-
abled on a gauge by gauge basis. The alarm parameters are described in the next section.
The gauge tag is a seven character programmable label that appears on the LCD display
and printer reports to identify tanks with text labels. The default gauge tag is “TANK#X:”
where X is the actual tank gauge number in the system (i.e. 1-8).
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