MATLAB XPC TARGET 4 - DEVICE DRIVERS Spécifications télécharger pdf (Page 87)

100

101

GPIB Simulink Block Reference

3-21

Shortcuts and Features for Messages

xPC Target defines the abbreviations wrt and rd to make message writing

easier with GPIB commands. When the message interpreter sees the

statements:

•

Structure_name(index).’wrt’, it is replaced with

Structure_name(index).’wrt ADDR’. For example, you could write

GPIB_Initialize(1).Command = ’wrt 8’;

or you could write

GPIB_Initialize(1).Address = 8;

GPIB_Initialize(1).Command = 'wrt’;

The following message fields, with the keyword ADDR, use the address value

8 defined in the message field .Address.

•

Structure_name (index).Command = ’rd’, it is replaced with

Structure_name(index).Command = ’rd #LENGTH ADDR’. For example, you

could write

GPIB_Initialize(1).Command = ’rd #10 8’;

or you could write

GPIB_Initialize(1).Address = 8;

GPIB_Initialize(1).RdLength = 10

GPIB_Initialize(1).Command = 'wrt’;

If you enter numerical values in the wrt and rd commands, then the command

uses those values instead of the values in the variables ADDR and LENGH.

For example, the following message uses the GPIB address 10 even though the

value for ADDR is defined as 8.

GPIB_Initialize(1).Address = 8;

GPIB_Initialize(1).Command = 'wrt 10';

Changes to the Read Command — When a GPIB rd command is sent to the

GPIB controller, the controller responds with the data and length of data. To

make using this command easier, the xPC Target diver block, discards the

length of data information. For example, using the normal GPIB

rd command,

you could write

GPIB_Message(1).Command = ’rd #20 16’;

1 2 ... 82 83 84 85 86 87 88 89 90 91 92 ... 652 653

Commentaires sur ces manuels

Pas de commentaire

MATLAB XPC TARGET 4 - DEVICE DRIVERS Spécifications Page 87

Commentaires sur ces manuels