STC SmartScanIS, Руководство пользователя

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EUD-2016026-00 Rev.2, SmartScanIS User’s Guide for Union Pacific, 14 January 2021
181
The report fragment below, from the header section of a Train Detail report, shows the location
of the "Slow Train" and "Very Slow Train" messages. For a given train, only one of these
conditions will be flagged and appear on the report. A train won't be both slow and very slow.
Southern Technologies Corporation
Integrated Detector System
Union Pacific Railroad
TRAIN DETAIL
==============================================================================
•
System Alarms
-----------------------------------------
Slow Train
Very Slow Train
•
10.4 Train Direction
Train direction is based on whether TO1 or TO2 generated the first gating transducer pulse.
10.5 Transducer Pulse Processing
As a wheel enters the sensing range of a transducer, the transducer should respond with a
positive going pulse. The polarization of the two wires from the transducer determines if this
pulse is positive or negative.
On the System Interface board (in the Controller module), the transducer signals undergo RF
filtering and amplification with a gain of 30. For validation, the amplified signals are fed into
comparators, which create 5-VDC pulses lasting the period of time that the amplified signals
remain above 620 millivolts. Processor-A (on the Processor board) receives these 5-VDC
pulses through ports PA0 (TO1) and PA1 (TO2).
System Interface Board
Scanner Interface Board
Talker Board
Processor Board