4-12
MS-890 Industrial Automation Scanner
User Manual
Serial Trigger
Serial Trigger
Serial Trigger Character (Delimited)
Note:
Serial Data
or
Serial Data and External Edge
triggering mode must
be enabled for Serial Trigger Character to take effect.
Usage:
Useful in applications where a read cycle needs to be initiated and/or ended
by user-defined serial characters.
Definition:
An online host command composed of a single ASCII host serial trigger
character that initiates or ends the read cycle.
Trigger characters are of two types: delimited and non-delimited. A delimited
character is enclosed within angle bracket delimiters
< >
.
A non-delimited trigger character is one that either starts or ends the read
cycle and is NOT enclosed by delimiters such as
< >
.
Rules for
Trigger
Modes
• In
External Edge
the scanner looks only for the
Start Trigger Character
and ignores any
End Trigger Character
that may be defined.
• In
External Level
, the
Start Trigger Character
begins the read cycle
and an
End Trigger Character
ends it. Note that even after a symbol has
been decoded and the data transmitted, the scanner remains in External
Level trigger read cycle until a
Stop
character is received.
• In
Serial Data and External Edge
trigger mode, command, either a
Start
Trigger Character
or a hardware trigger can start an
Edge
trigger read
cycle.
Usage:
Useful in applications where a single serial character enclosed in angle brackets
initiates the read cycle.
Definition:
A delimited trigger character is one that starts the read cycle, is enclosed by
delimiters such as
< >
, and can only be sent when the trigger mode is set to
Serial Data
or
Serial Data and External Edge
.
Serial Cmd:
<
K201,
serial trigger character
>
Default:
^]
(corresponds to
<GS>
displayed in the embedded menu)
Options:
Any single ASCII character, including control characters, except
NUL
(
00
in
hex), an existing host command character, or an online protocol character.
Control characters entered on the command line are displayed in the menu
as mnemonic characters.
Содержание MS-890
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Страница 308: ...A 44 MS 890 Industrial Automation Scanner User Manual Glossary of Terms...