10-18 Remote Operations Model 6220/6221 Reference Manual
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Multiple response messages
If you send more than one query command in the same program message (see
“Multiple command messages,” on page 10-16), the multiple response messages
for all the queries are sent to the computer when the Model 622x 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. Always tell the Model 622x what to send to the computer. The following
two steps must always be performed to send information from the instru-
ment to the computer:
1. Send the appropriate query command(s) in a program message.
2. Address the Model 622x to talk (GPIB only).
Rule 2. The complete response message must be received by the computer
before another program message can be sent to the Model 622x.
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