Microscan MS-1 Integration Manual page 66

Trigger Mode
External Edge
Usage: This mode is highly recommended in any application where conveying
speed is constant, or if spacing, object size, or read cycle timeouts are
consistent.
Definition: External Edge, as with Level, allows the read cycle (active state) to begin
when a trigger (change of state) from an external sensing device is
received. However, the passing of an object out of sensor range does not
end the read cycle. The read cycle ends with a good read output, or,
depending on the End of Read Cycle setting, a timeout or new trigger
occurs.
Serial Cmd: <K200,3>
Serial Data
Usage: Serial Data is effective in a highly controlled environment where the host
knows precisely when the object is in the field of view. It is also useful in
determining if a No Read has occurred.
Definition: In Serial Data, the MS-1 accepts an ASCII character from the host or
controlling device as a trigger to start a read cycle. A Serial Data trigger
behaves the same as an External Edge trigger.
Serial commands are entered inside angle brackets, as shown here: <t>.
Serial Cmd: <K200,4>
Note: In Serial Data, sending a non-delimited start serial character will start a read cycle;
however, a non-delimited stop serial character has no effect.
Serial Data and Edge
Usage: Serial Data and Edge is seldom used but can be useful in an application
that primarily uses an external sensing device but occasionally needs to be
triggered manually.
An auxiliary terminal can be connected to the auxiliary port so the user can
send the serial trigger character through the MS-1 to the host.
Definition: In this mode the MS-1 accepts either a serial ASCII character or an external
trigger pulse to start the read cycle.
Serial Cmd: <K200,5>
Note: In Serial Data, sending a non-delimited start serial character will start a read cycle;
however, a non-delimited stop serial character has no effect.
6-8
Initiate Read Cycle:
Object # 1, moving in front of the
detector beam, causes a change in
the trigger state, which initiates the
read cycle.
Initiate Second Read Cycle:
Object # 2, moving in front of the
detector beam, causes another
change in the trigger state. This sig-
nal initiates a new read cycle and
ends the previous read cycle unless
Timeout is enabled and a good read
or timeout has not occured.
MS-1 Scan Engine Integration Manual