Section 7
Parameter Settings
39
FT742-SM (RS422 & RS485) Sensors
– User Manual
7.2 User Calibration Table
The User Calibration Table includes up to 64 user programmable records. Each record comprises a pair of
values representing the corrected speed (wind tunnel speed) and the corresponding uncorrected wind sensor
speed. In addition to the calibration table, there is provision for a user-defined text string of up to 32 characters
which is stored together with the table.
The User Calibration Table records must be entered in ascending order of wind sensor speed. The minimum
allowable difference between wind sensor speed values in consecutive records is 0.5m/s.
To load the User Calibration Table with data, the following steps need to be taken:
1. The Table must first be cleared (See Section 7.4.24).
2. Each pair of table row values is entered into a RAM copy of the User Calibration Table (See Section
3. A text string linked to the table may be entered if desired. This can be entered at any point after the
table is cleared and before the RAM copy of the table is saved into Flash memory. (See Section
7.4.27)
4. The RAM copy of the User Calibration Table is saved into Flash memory (See Section 7.4.26
At any point in the above procedure (or at any other time) commands can be sent to the wind sensor to:
•
Verify that the table has been cleared;
•
Verify the last row of data written to the table;
•
Read the number of table entries and the table checksum;
•
Read out a selected row of table data,
•
Read out the User Calibration Table label.
See Sections 7.4.23 - 7.4.27 for further details.
