Instruction manual

Chapter 3 Programming Your Counter for Remote Operation
Overview of Response Message Formats
Programming Guide 3-21
3
Overview of Response Message Formats
Response Messages
Response messages are data sent from the Counter to a computer in
response to a query. (A query is a command followed by a question mark.
Queries are used to find out how the Counter is currently configured and
to transfer data from the Counter to the computer.)
After receiving a query, the Counter interrogates the requested configuration
and places the response in its output queue. The output message remains
in the queue until it is read or another command is issued. When read, the
message is transmitted across the GPIB or the serial interface to the
computer. You read the message by using some type of enter statement
that includes the device address and an appropriate variable. Use a print
statement to display the message. The following BASIC example
illustrates how to query the Counter and display the message:
10 OUTPUT 703;":ROSC:SOUR?"
20 ENTER 703; A$
30 PRINT A$
40 END
Response Message Syntax
Figure 3-9 shows the simplified syntax of a Response Message. Response
messages may contain both commas and semicolon separators. When a
single query command returns multiple values, a comma is used to
separate each item. When multiple queries are sent in the same program
message, the groups of data corresponding to each query are separated by
a semicolon. Note that a <new line> ^END is always sent as a response
message terminator.