B&B Electronics Parallel Printer Card PIOC Manuale Utente Scaricare il pdf (Pagina 43)

GHI Electronics,LLC USBwiz User Manual

USBwiz Command Set

CF - Close File Handle

This command issues a flush file (FF – Command) automatically and then closes the file

handle. Afterwards, the handle will available for future use.

Format CF<SP>n<CR>

!00<CR>

Close File handle n

RF - Read from File

After opening a file, any amount of data can be read using this command. To read more

data, send another RF command and so on. If all requested data is not available

(reached file end), USBwiz will pad the output with a filler byte given by the user.

When reading, the data is sent directly to the user with no formatting (no interpretation

or conversion).

Format RF<SP>nM>ssssssss<CR>

!00<CR>

ssssssss Bytes is

returned

$aaaaaaaa<CR>

!00<CR>

n File Handle

M Filler Character

ssssssss HEX DWORD desirable data

size to be read

aaaaaaaa HEX DWORD actual read data

from file size

Example We have a file with 8 bytes (ABCDEFGH) in it, and it is opened for

read with handle number 2.

RF<SP>2Z>5<CR>

!00<CR>

ABCDE

$00000005<CR>

!00<CR>

RF<SP>2Z>5<CR>

!00<CR>

FGHZZ

$00000003<CR>

!00<CR>

Read 5 bytes twice from a file handle 2

with filler Z

WF - Write to File

After opening a file, any amount of data can be written using this command. To write

more data, send another WF command and so on. Note that if first error code is not !00

(an error occurred), the command would halt and further commands are processed, so

sending the file data upon an error code would result in the data being not being written

and processing these data as commands.

When writing, the sent data is written directly to the file with no formatting (no

interpretation or conversion). Also, when requesting to write a certain amount of bytes,

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