Weigh Scale Mode
2.2.2
RANGE
The RANGE button changes the units or range of the display. RANGE cycles through all available units;
see
for details. When the RANGE button is depressed, it displays the selected unit.
2.2.3
CAL
Pressing CAL initiates the two-point calibration sequence. See
for details.
2.3
Calibration
Two-point calibration is performed by pressing the CAL button. When this button is pressed, the board
executes the following command sequence:
1. The board scrolls the message,
REMOVE WEIGHT
.
2. The user removes all weight from the load cell and presses any button.
3. The board measures the load cell voltage and records it as the zero point.
4. The board scrolls the message
PLACE CAL WEIGHT
.
5. The user places a weight on the load cell and presses any button. The weight should have the mass
that was selected in the configuration mode.
6. The board measures the load cell voltage and records it as the calibration weight.
New calibration data is lost when power is removed. To prevent this data loss, calibration data can be
saved, with other board settings, to flash memory. See
for details.
2.4
Configuration
The parameters for Scale mode can be adjusted in the configuration mode.
To enter configuration mode, press the PARM buttons simultaneously. The four buttons then assume the
functions shown in the CONFIG box. To exit Configuration mode, press the PARM buttons simultaneously
again. This function does not cause parameters to be adjusted, because only button releases are detected
in Configuration mode.
Configuration mode contains a number of adjustable parameters. To scroll through the available
parameters, use the PARM buttons. To change the parameter values, use the VALUE buttons.
Some items in configuration mode are not parameters, but commands or gateways to a submenu. These
items are labelled as words with a question mark. To enter these or to execute the command, press SEL
or ENT.
All parameters in the analysis and scale configuration menus are independent, including the parameters
found in both modes.
summarizes the available parameters.
Table 2. Parameters in Configuration Mode
Parameter
Display
Value Range
Description
Display units
UNIT=
μ
g, mg, g, kg, lb, st, oz
Display units
Averages
AVGS=
2
–
128
Number of points to
average
ADC speed
SPD=
FAST, SLOW
Acquisition rate
Calibration mass
CW=
0
–
99.9 in various units
Calibration mass and unit
Save parameters
SAVE?
—
Save parameters; see
Version number
V1.0.0
—
Firmware version number
display
9
SBAU175A
–
July 2010
–
Revised August 2011
ADS1131REF and ADS1231REF
Copyright
©
2010
–
2011, Texas Instruments Incorporated
