Intermec Trakker Antares 2420, User Manual

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Glossary
G-21
G
spread spectrum
A radio data transmission modulation technique by which the transmitted signal is spread
over a bandwidth wider than the information bandwidth.
start/stop code (or character)
A special bar code character that provides the scanner with start and stop reading
instructions as well as a scanning direction indicator. The start character is normally at
the left hand end of a horizontally oriented symbol (bar code label). The stop character is
normally at the right hand end of a horizontally oriented symbol. For Code 39, the
asterisk (*) character is used.
stop bits
A bit that signals the end of a character. One of the serial communications parameters.
store and forward
A method where messages are temporarily stored in the DCS 300 before they are
transmitted to their destination. It is used when the upline network or host application is
temporarily stopped.
subnet mask
An internal TCP/IP protocol stack variable. This mask is used in the IP protocol to
separate the subnet address from the local IP address. The IP protocol performs a bit-
wise AND on the IP address and the subnet mask. Each address segment represents one
byte, where 255 converts to FF hex. This computation is used to find out if the DCS 300
or host and T2425 are on different subnetworks.
For example, if the terminal IP address is 192.9.150.184 and the subnet mask is
255.255.255.0, the terminal is on the subnetwork 192.9.150.0.
subnetwork
See domain.
Suspend mode
The mode the terminal enters when you press
L to turn off the terminal. In Suspend
mode, the terminal saves all memory and turns off the power to most of the hardware.
Contrast with “resume.”
symbology
See bar code symbology.