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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:

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.

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=

μg, 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

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