Measurement-computing Micro 488/EX rev.2.1 Manual do Utilizador descarregar pdf (Página 63)

Section 4 General Programming

4.21

file.

Lines

230

350

Sets up the file header with comments. These comments

include the

HELLO

response, the

DAY

TIME

DATE

and

the user's comment line from Line

200

Lines

390

400

Determines the log buffer size or character

COUNT

Lines

430

470

The main program loop. Tests to determine if the number

of serial characters received is >

or equal to

COUNT

If either is true, the subroutine at Line 480 is called.

Lines

480

560

Transfers the characters from the PC's serial input to the

disk output file. Before it transfers the characters, it

issues an

Xoff

character to the Micro488/EX to prevent

the PC's serial buffer from being overrun. It adjusts

COUNT

by the number of characters transferred and

issues the

Xon

character before returning to the main

loop.

Lines

570

800

Gets the output file name from the user. If a file

extension is not specified, the extension '

LOG

' is used.

After the user enters the file name, it tests to determine if

the file already exists by opening the file for input. If the

file does not exist, an error is generated and the program

vectors to Line

790

. Line

800

causes the program to

resume at the Line

750

which opens the new output file.

4.4.9 Saving the MACRO Buffers to Disk

The following program example reads and records all of the

Micro488/EX's macro buffers and sends the information they contain to an

ASCII text disk file for later recall or edit. The example is written in PC

basic. Serial handshaking has not been implemented in this program. Basic

maintains a 255 character buffer and most macros will contain less than 127

characters. Since the macro is completely transfered to disk prior to

requesting a

READ

of another macro, serial input buffer overrun on the PC

is unlikely. Only defined macros contained in the Micro488/EX are sent to

the disk file.

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