Honeywell SMV800 User Manual page 191

Correcting the Upper Range Value (URV) for Static Pressure:
Calibrate 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 SP
Calibration screen as show below. SP Calibration is available at Maintenance-
>Calibration and Correction Records->Static Pressure Calibration.
5. Adjust the pressure source to apply pressure equal to the URV (100%), and
6. Click on "SP URV Correct" button. follow the on-screen prompts.
Calibrate manually by writing to Modbus registers:
1. Write the URV value for which the correction is required to the registers 675-676.
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 SV input Pressure to the exact value of the URV.
4. Write to single coil address 4 as ON
Resetting Calibration for Static 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 SP
Calibration screen as show below. SP Calibration is available at Maintenance-
>Calibration and Correction Records->Static Pressure Calibration.
5. Click on "SP Reset Corrects" button. follow the on-screen prompts.
Revision 1.0 SMV800 Modbus User's Guide
th
2018 write to register 125-
Page 179