Keithley 6487 Reference Manual page 160

Model 6487 Reference Manual
Program Message Terminator (PMT)
Each program message must be terminated with an LF (line feed), EOI (end or identify),
or an 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:
:trac:poin 10 <PMT>
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 6487 is 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," on page
sent to the computer when the Model 6487 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
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.
For fastest command execution:
1. Do not use optional command words (i.e., [:SENSE [1]]).
2. Do not use the colon (:) at the beginning of a program message.
3. Always use the short-form versions of commands and parameters.
4. Minimize the amount of "white" space in command strings.
5. Keep numeric parameters simple (i.e., 1 vs. 1.000e + 00).
6. Use all uppercase.
9-14), the multiple response messages for all the queries is
Remote Operation
"Multiple
9-15