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10-16
Command execution rules
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Response messages
A response message is the message sent by the instrument to the computer in response to a
query command program message.
Sending a response message
After sending a query command, the response message is placed in the Output Queue.
When the Model 2790 is then addressed to talk, the response message is sent from the
Output Queue to the computer.
Multiple response messages
If you send more than one query command in the same program message (see
command messages," page
sent to the computer when the Model 2790 is addressed to talk. The responses are sent in
the order the query commands were sent and are separated by semicolons (;). Items within
the same query are separated by commas (,). The following example shows the response
message for a program message that contains four single item query commands:
0; 1; 1; 0
Response message terminator (RMT)
Each response is terminated with an LF (line feed) and EOI (end or identify). The follow-
ing example shows how a multiple response message is terminated:
0; 1; 1; 0 <RMT>
Commands execute in the order that they are presented in the program message.
An invalid command generates an error and, of course, is not executed.
Valid commands that precede an invalid command in a multiple command program
message are executed.
Valid commands that follow an invalid command in a multiple command program
message are ignored.
10-14), the multiple response messages for all the queries are
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