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Program message terminator (PMT)
Each program message must be terminated with a LF (line feed), EOI (end or identify), or a
LF + EOI. The bus will hang if your computer does not provide this termination. The following
example shows how a program message must be terminated:
utp on <PMT>
:o
Command execution rules
•
Commands execute in the order presented in the program message.
•
An invalid command generates an error and is not executed.
•
Valid commands preceding an invalid command in a multiple command program
message are executed.
•
Valid commands following an invalid command in a multiple command program
message are ignored.
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 relay unit 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 the multiple
response messages for all the queries are sent to the computer when the relay unit 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 exam-
ple 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 EQI (end or identify). The following
example shows how a multiple response message is terminated:
0;l;l;0 <RMT>
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Operation
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