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Chapter

BASIC

Commands

165

Example

STOP_DEBUG

See Also

START_DEBUG

5.23 Reserved Host Commands

There are some commands reserved for the host computer to read/remove data of the

transaction file, or to adjust the system time. The user's BASIC program does not need to do

any processing because these tasks will be processed by the background routines of the

BASIC run-time.

Note: Each reserved command is ended with a carriage return, which can be changed by

the COM_DELIMITER function. If any format error occurs, the terminal would

return "NAK".

CLEAR

Purpose

To erase data of a specified transaction file.

Syntax

A$ = CLEAR

A$ = CLEAR(file%)

Remarks

"A$" is a string variable to be assigned to the result.

Value Meaning

NAK

The command is processed successfully.

Any format error occurs.

The CLEAR command will clear data of the first transaction file, which is the

default one.

"file%" is an integer variable in the range of 1 to 6, indicating which transaction file

is to be erased.

Example

CLEAR3 ' to delete data of the 3rd transaction file

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Metrologic IS1000 Series Guía de usuario Pagina 171