Honeywell SMV800 User Manual page 188

Calibrate manually by writing to Modbus registers:
1. Write the URV value for which the correction is required to the registers 667-668.
2. Write the date in the DDMMYY-- format in the calibration time and date register.
(Register address 125-126)

The date to be written as month and day followed by the year.

Year to be entered as year -1900.
For example, to enter calibration date as June 10
126 as 0x0A067600
3. Adjust the PV input Pressure to the exact value of the URV.
4. Write to single coil address 2 as ON
Resetting Calibration for Differential Pressure:
Reset Calibration using SMV Modbus application:
1. Connect power supply and RS485 connectors to the signal terminals of the
Transmitter's terminal block.
2. Connect the precision pressure source to the high-pressure side of the DP-type
Transmitter.
3. Turn on the power supply, and allow the Transmitter to become stable.
4. Launch SMV Modbus application, connect to the device and go to the DP
Calibration screen as show below. DP Calibration is available at Maintenance-
>Calibration and Correction Records->Differential Pressure Calibration.
5. Click on "DP Reset Corrects" button. follow the on-screen prompts.
Reset Corrects for Differential Pressure manually by writing to Modbus
registers:
1. Write the date in the DDMMYY-- format in the calibration date register. (Register
address 125-126)

The date to be written as month and day followed by the year.

Year to be entered as year -1900.
For example, to enter calibration date as June 10
126 as 0x0A067600
2. Write to single coil address 8 as ON
Page 176 SMV800 Modbus User's Guide
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2018 write to register 125-
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2018 write to register 125-
Revision 1.0