Rockwell-automation GMLC Reference Manual Manual de usuario descargar pdf (Pagina 460)

100

101

Publication GMLC-5.2 - November 1999

On Key Press 423

Checking for Any Key

Selecting Any Key, with If Key selected, causes program flow to branch

to the true node (at the top of the block) if any keystroke character has

been received by serial port B. If no character has been received, program

flow branches to the false node (at the bottom of the block). This selection

is useful for determining that a key has been pressed or a character

received before evaluating it.

Waiting for Any Key

Selecting Any Key, with Wait for Key selected, pauses the program until

any keystroke character has been received by the serial port B. This

selection is useful for waiting for a keystroke character to be received

before evaluating it.

Waiting or Checking for a Specific Key

The effect of selecting Specific Key from the Key Type menu depends

upon your Type selection (Wait for Key or If Key), as follows.

Checking for a Specific Key

Selecting Specific Key, with If Key selected, causes program flow to

branch to the true node (at the top of the block) only if the specific

character, entered in the data entry box, has been received by serial port

B. If any other character (or no character) has been received, program

flow branches to the false node (at the bottom of the block).

This selection is useful for interpreting a received keystroke character

before taking specific action. For example, the following example checks

for either a + or – character to be received and then moves an axis in the

appropriate direction.

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Rockwell-automation GMLC Reference Manual Manual de usuario Pagina 460

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