17
xxxxxxxx is stored in locations
B0
through
B2
. yyy is stored in location
B3.
Examples:
2FDDE901
= Honeywell Part Number
220
31370
-
0
01
Special-order code
–T
001.
37107D07
= Honeywell Part Number
580
36087
-
0
01
Special-order code
–T
007.
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.