Rockwell-automation 2755-DM9, -DM9E High Speed Decoder Manual de usuario descargar pdf (Pagina 27)

Chapter 3

How the Decoder Operates

3–8

In the triggered mode of operation, there are three possible trigger sources:

• Host command - The command is generated by a host computer or

programmable controller.

• Package detect - A package detector connected to the scan head is the

source for the trigger.

• Internal timer - The internal timer cycles the trigger from on to off based

on a timed interval.

When a trigger on is received, the decoder will continuously attempt to

decode bar codes until one of the following trigger ending conditions occurs:

(a) The number of fields (bar codes) per package count is satisfied.

(b) A trigger off command is sent by a host device.

(d) The internal timer (No-Read timer) times out.

In the triggered mode of operation there are two options which determine

when the decoder will send bar code information to a host and/or operate

discrete outputs:

• After Valid Package - A valid package is a package that has valid bar

code symbols and meets the fields (bar codes) per package count

(condition

(a) listed above).

• End of Trigger - Refer to trigger ending conditions (b, c, d) listed above.

Trigger Ending Coditions

Response Modes

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 166 167

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Rockwell-automation 2755-DM9, -DM9E High Speed Decoder Manual de usuario Pagina 27