Appendix A
Glossary
This Appendix provides definitions for terms used throughout the
SmartPass
®
System Guide.
Terms and Definitions
The following table defines special terms used in this document.
AAR
Association of American Railroads
AC
alternating current
ACK
acknowledge (data valid)
antenna
passive device that converts RF energy into magnetic energy (RF signal)
ARC
Amtech Response Center
ASCII
American Standard Code for Information Interchange
ASIC
application-specific integrated circuit
ATA
American Trucking Associations
aux
auxiliary
backscatter
portion of an RF signal that is modulated by a tag and radiated back to the reader
baud
measure of number of bits per second of a digital signal; for example, 9600 baud = 9600
bits per second
BCKS
boot checksum
BCM
buffer control mode
BIT
built-in test
bps
bits per second
byte
a binary character; for example, one 8-bit ASCII character
CCITT
Consultive Committee on International Telegraphy and Telephony
check tag
tag mounted inside SmartPass assembly, or in an external antenna, that is used to check
operation of SmartPass.
cmd
command
CTRL
control
comm
communications
command
data set that is recognized by the receiving device as intending to elicit a specific response
conduit
flexible steel pipe use for electrical wiring
cps
characters per second
A-3
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