Denso Power Net Terminal BHT-103 Especificações descarregar pdf (Página 368)

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Chapter 15. Function Reference

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Syntax:

INKEY$

Description:

INKEY$ reads from the keyboard to see whether a key has been pressed, and

returns one character read. If no key has been pressed,

INKEY$ returns a null

string. (For the character codes, refer to Appendix C. For the key number assign-

ment, refer to Appendix E.)

•

INKEY$ does not echo back a read character on the LCD screen.

• A common use for

INKEY$ is to monitor a keystroke while the BHT is ready for

bar code reading or other events.

• If any key previously specified for keystroke trapping is pressed,

INKEY$ cannot

return the typed data since the

INKEY$ has lower priority than keystroke trap-

ping.

• To display the cursor, you use the

LOCATE and CURSOR statements as shown

below.

LOCATE,,1:CURSOR ON

k$=INKEY$

IF k$="" THEN...

Reference:

INput KEYboard I/O function

INKEY$

Returns a character read from the keyboard.

Statements:

CURSOR, KEY OFF, KEY ON, and LOCATE

Functions:

ASC and INPUT$

1 2 ... 363 364 365 366 367 368 369 370 371 372 373 ... 576 577

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