Microscan MS-2 User Manual download pdf (Page 54)

4-8 MS-2 CCD Reader User’s Manual

Trigger Mode

External Edge

Serial Data

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

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.

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>

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 reader 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>

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 reader to the host.

Definition: In this mode the reader accepts either a serial ASCII character or an external

trigger pulse to start the read cycle.

Serial Cmd: <K200,5>

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.

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Microscan MS-2 User Manual Page 54

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