Honeywell IPT User Manual page 17

xxxxxxxx is stored in locations B0 through B2. yyy is stored in location B3.
Examples:
2FDDE901 = Honeywell Part Number
37107D07 = Honeywell Part Number
3.3.2.10 Checksum Bytes
Two checksum bytes (Checksum Bytes) are stored in locations B4 and B5. The
checksum bytes are stored such that an 8-bit Fletcher checksum calculation (Modulo
256) on the primary storage area (00 through B5) yields a zero for each of the calculated
8-bit Fletcher Checksum values.
In the case of the example Table 1 below, the checksum bytes are B4 and 64.
See section 6 for a description of the Fletcher Checksum.
3.3.2.11 Supplemental Information: Pressure Sensor Temperature to °C Coefficients
The 4 correction coefficients (g1 through g4) are stored in 32-bit IEEE 754 format in
locations B8 through C7.
Example: -1796.9403 = C4E09E17
3.3.2.12 Supplemental Information: "Seed" Values and Corresponding Corrected Pressure
To aid in development and debug of the Pressure Correction Algorithms found in section
3.2.1, a transducer-specific 24-bit Seed Pressure Count (spc), a 16-bit Seed
Temperature Count (stc) and the corresponding 32-bit IEEE 754 Corrected Seed
Pressure reading (csp) have been stored in the IPT EEPROM:
The 24-bit spc value is stored in locations C8 through CB with leading zero's.
The 16-bit stc value is stored in locations CC through CF with leading zero's.
The 32-bit csp value is stored in locations DO through D3 in IEEE 754 format.
3.3.2.13 Supplemental Information: Checksum Bytes
Two checksum bytes (Checksum Bytes) are stored in locations D4 and D5. The
checksum bytes are stored such that an 8-bit Fletcher checksum calculation (Modulo
256) on the supplemental storage area (B8 through D5) yields a zero for each of the
calculated 8-bit Fletcher Checksum values.
In the case of the example Table 1 below, the supplemental checksum bytes are CB and
1A. See section 6 for a description of the Fletcher Checksum.
3.3.2.14 Unused Locations
Locations B6, B7 and D6 through FF are unused and available for storage of customer
information.
–T
Special-order code
–T
Special-order code
31370- 01
220 0
001.
36087- 01
580 0
007.
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