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14 January 2021, SmartScanIS User’s Guide for Union Pacific, EUD-2016026-00 Rev.2
The SmartScanIS calculates a checksum for each train. This checksum is stored with the train
data. Later, when the system retrieves this data, it recalculates the checksum. If the two
checksums don't match, the extended Exception Detail report so states, as shown below.
Southern Technologies Corporation
Integrated Detector System
Union Pacific Railroad
EXCEPTION DETAIL
==============================================================================
CHECKSUM ERROR: StartAddr 134879 EndAddr 134930
In addition, each axle has a checksum associated with it. If an axle is determined to have an
invalid checksum, the extended Exception Detail report so states in the associated axle's row,
as shown below.
Southern Technologies Corporation
Integrated Detector System
Union Pacific Railroad
EXCEPTION DETAIL
==============================================================================
Train#:
5
Speed:
43
Milepost: 0501.2
•
•
•
Rail
TxdHits
Car
Axle
North South
ON
OFF
PW1 PW2 TO1 TO2
Alarms
-------------------------------------------------------------------------
1
1
56°
21°
25
0
8
8
2
2
2
57°
21°
25
59
5
5
2
2
3
56°
21°
25
59
5
5
2
2
4
CHECKSUM ERROR: StartAddr 136416 EndAddr 136427
5
56°
21°
25
59
5
5
2
2
6
56°
21°
25
59
4
5
2
2
2
7
56°
20°
25
162
5
5
2
2
8
56°
21°
25
59
5
5
2
2
•
•
•
The extended Exception Detail report is divided into a header section and a detail section.
The header section contains general information about the site (like milepost) and some detail
information about the exception train (like train's exit speed) that passed the site. The detail
section contains more detailed information (like car number) about the train.
Summary of Contents for SmartScanIS
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