Measurement-computing Analyzer488 Manuale Utente Scaricare il pdf (Pagina 139)

100

101

Section 4 Serial Controller

4.45

MASK

The

MASK

command is used to mask the most significant bit (MSB) of serial

input data. Some serial host computers set the MSB (high bit) when using eight bit

serial data lengths. When the

MASK

command is issued, each serial character

received is logically

AND

ed with

&H7F

(

127

decimal).

MASK

OFF

is the factory default. In default operation, all serial input data is

automatically masked with

&H7F

. The exception to this is any data which follows a

semi-colon (

;

), an apostrophe (

) or a quotation mark (

). After a

MASK

command, all characters are masked.

The query option

MASK?

returns the state of the

MASK

command.

TYPE System command

SYNTAX

MASK

{[

OFF

]}

RESPONSE None

MODE Any

BUS STATES None

QUERY The string MASK ON

MASK OFF

RESPONSE

EXAMPLE PRINT#1,"MASK ON"

1 2 ... 134 135 136 137 138 139 140 141 142 143 144 ... 280 281

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