Dini Argeo DGT1SAN Quick Start Manual - Page 11

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20. Modbus protocol - Calibration sequence

DESCRIPTION

1. Send command 0023 Hex

2. Set the span adjustment weight in registers 40902 and 40903 (if diffe-

rent from the one used during the last calibration)

3. Zero capture: unload the scale and write the "ACQUISITION POINT"

command (0025 Hex) into the command register (40001)

Set parameter "0" into parameter register (40002 / 40003)

4. Read the calibration status into input register (30116)

5. If acquisition is OK proceed with step 6. Otherwise check the load cell mV: they have to be stable.

6. Span capture: load the scale with span weight and write the acquisi-

tion command (0025 Hex) into the command register (40001)

Set parameter "1" into parameter register (40002 / 40003)

7. Read the calibration status into input register (see point 3)

8. If acquisition is OK proceed with step 9. Otherwise check the load cell mV: they have to be stable and greater then zero point.

9. Store calibration using the write calibration command (0024 Hex)

10. Wait for calibration OK status in register 30116

NOTES:

•

While write calibration command is in progress, some Modbus reading timeout may happen because of the saving procedure

•

To abort the calibration underway use 0026 Hex command in register 40001

EXAMPLE

(MSB)

00 Hex 00 Hex

00 Hex 01 Hex

00 Hex 02 Hex

00 Hex 03 Hex

00 Hex 04 Hex

00 Hex 05 Hex

(MSB)

00 Hex 04 Hex

TECH_MAN_ENG_DGT1S_QSG

00 Hex

23 Hex

(LSB)

Weight value examples

1000

6000

15000

00 Hex

03 Hex

17 Hex

3A Hex

E8 Hex

70 Hex

98 Hex

(LSB)

00 Hex

25 Hex

(LSB)

00 Hex

(LSB)

30116

(LSB)

Calibration not started

Acquisition underway

Acquisition OK

Acquisition error

Calibration OK

Calibration error

00 Hex

25 Hex

(LSB)

00 Hex

01 Hex

(LSB)

00 Hex

24 Hex

(LSB)

30116

(LSB)

Calibration OK

350000

00 Hex

05 Hex

57 Hex

30 Hex