Microscan MS-2 Uživatelský manuál stáhnout pdf (Strana 53)

MS-2 CCD Reader User’s Manual 4-7

Read Cycle

Trigger Mode

Continuous Read

External Level

Definition: The Trigger is the event that initiates a read cycle.

Serial Cmd: <K200,trigger mode>

Default: Continuous Read

Options: 0 = Continuous Read

2 = External Level

3 = External Edge

4 = Serial Data

5 = Serial Data and Edge

Usage: Continuous Read is useful in testing symbol readability or reader functions.

It is not recommended for normal operations.

Definition: In Continuous Read, trigger input options are disabled and the reader is

always in the read cycle. If a single symbol stays within read range for

multiple read cycles, its data will be transmitted repeatedly until it leaves

the read range.

The reader sends replies to serial commands that require responses when

symbol data is transmitted.

Note: No Read

options have no affect on

Continuous

Read.

Serial Cmd: <K200,0>

Usage: This mode is effective in an application where the speeds of the conveying

apparatus are variable and the time the imager spends reading each object

is not predictable. It also allows the user to determine if a No Read has

occurred.

Definition: External Level allows the read cycle (active state) to begin when a trigger

(change of state) from an external sensing device is received. The read

cycle persists until the object moves out of the sensor range and the active

trigger state changes again.

Serial Cmd: <K200,2>

Initiate Read Cycle:

Object #1, moving in front of the

detector beam, causes a

change in the trigger state,

which initiates the read cycle.

End Read Cycle:

The same object, moving out of

the detector beam, causes

another change in the trigger

state, which ends the read cycle.

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