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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
Section 2.1 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 Section 2.3 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 are lost when power is removed. To prevent this data loss, calibration data can be
saved, with other board settings, to flash memory. See
Section 3.4.1 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 VALUE buttons. To change the parameter values, use the PARM 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 either
of the PARM buttons.
All parameters in the analysis and scale configuration menus are independent, including the parameters
found in both modes.
Table 2 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
Channel CHANNEL 1, 2 Analog input channel
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
Offset calibration OCAL? — Offset calibration; see text
Save parameters SAVE?
—
Save parameters; see text
Version number V1.1.0 — Firmware version number
display
9 SBAU120B – November 2005 – Revised July 2011 ADS1232REF User ' s Guide
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