Measurement Computing Analyzer488 - Manual (Page 139)

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 ON command is issued, each serial character
received is logically ANDed 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 ON
command, all characters are masked.
The query option MASK? returns the state of the MASK command.
TYPE System command
SYNTAX MASK {[ON | OFF]}
RESPONSE None
MODE Any
BUS STATES None
QUERY The string MASK ON or MASK OFF
RESPONSE
EXAMPLE PRINT#1,"MASK ON"