Response messages
A response message is the message sent by the instrument to the computer in
response to aquery command.
Sending a response message
Afte sending a query command, the response message is placed in the Output
Queue. When the IT8500+ Series 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
the paragraph entitled, “Multiple Command Messages”), the multiple response
messages for all the queries is sent to the computer when the IT8500+ Series is
addressed to talk. The responses are sent in the order that 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 following example shows how a multiple response message is terminated:
0; 1; 1; 0; <RMT>
Message exchange protocol
Two rules summarize the message exchange protocol:
Rule 1.You must always tell the IT8500+ Series what to send to the computer.
The following two steps must always be performed to send information from the
instrument other computer:
1. Send the appropriate query command(s) in a program message.1.
2. Address the IT8500+ Series to talk.
Rule 2.The complete response message must be received by the computer
before another program message can be sent to the IT8500+ Series.
1.6 Command Format
Formats for command display are as follows:
[SOURce[1|2]:]VOLTage:UNIT {VPP|VRMS|DBM}
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