Query Response Format; Scpi Command Terminator - Racal Instruments 1269 User Manual

1269 User Manual
Query Response
Format
SCPI Command
Terminator
IEEE-STD-488.2
Common
Commands
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VXI:CONF:MON:TRIG:DELAY 0.5
Query the trigger delay by executing:
VXI:CONF:MON:TRIG:DELAY?
The response to a query depends on the command sent to the
instrument to generate the query response. In general, a
response to a query contains present values or settings of the
EMS. Commands that set values can be queried about their
present value of the setting. Commands that set modes of
operation can be queried about their present mode setting.
A command string sent to the EMS must be terminated with a
one of the following:
1) An ASCII linefeed character: (decimal 10, hex 0A, 'C'
char '\n').
2) The last character with the END bit set to 1.
3) An ASCII linefeed character with the END bit set to 1.
The END bit for a VXI instrument is analogous to the GPIB EOI
line. The END bit is sent along with each character using the
Word Serial Byte Available command.
controllers translate the GPIB EOI line to VXIbus protocol,
which sets the END bit to identify the last character of a
command.
Over the RS-232 interface, there is no EOI line. Therefore,
ALL commands transmitted over the RS-232 interface must be
terminated with the ASCII newline character.
The IEEE-STD-488.2 standard defines a set of common
commands that perform functions like reset, trigger and status
operations. Common commands begin with an asterisk ( * ),
are four to five characters in length, and may include
parameters. The command keyword is separated from the first
parameter by a blank space. Use a semicolon ( ; ) to separate
multiple commands as shown below:
*RST; *STB?; *IDN?
GPIB/VXI
SCPI Command Reference 5-5
slot 0