User Manual 2460 Series
Programming The 2461 Module 4-4
Racal Instruments
2003
Commands and string data in SCPI have two forms, long form
and short form, in the following command definitions and
examples capitals are used to represent the short form and a
mix of capitals and lowercase make up the long form. The
2461 can only accept the long or the short form as defined.
Using a form between short and long form is not permissible.
Sending and Receiving
SCPI Commands Over
the VXI
bus
SCPI commands are sent over the VXI
bus
by using the word
serial command,
byte available.
See definition later. The last
byte sent in a command line must either have the END bit set
or a Line Feed must be appended to the end of the command
line. The system controller will usually set the END bit for the
user. It is permissible to terminate a command line with both
an END bit set and a Line Feed appended provided the END
bit is set when sending the Line Feed.
To receive a message from the 2461, the word serial
command
byte request
command should be used. The
previous message sent must have contained at least one
query command. For each
byte request
command, a single
word is read by the controller containing one byte of reply
data. This repeats until the end bit in the response from the
2461 is set.
Selecting an
Application
The 2461 general command set is available at all times. This
includes the commands to interrogate which cards are
installed and to select which card is to be addressed next. To
determine which application cards are installed, the operator
should send:
INST:CAT?
If two UCT application cards are fitted the reply will be:
COUNter1, COUNter2
To select counter 2 (card located at the lower end of the front
panel) the operator should send:
INST:SEL COUNter2
The command set for card 2 (a counter) is now enabled.
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