Remote Operations 13-15
• When the path pointer detects a colon (:) that immediately follows a semicolon (;), it
resets back to the root level.
• The path pointer can only move down. It cannot be moved up a level. Executing a com-
mand at a higher level requires that you start over at the root command.
Using common and SCPI commands in the same message
Both common commands and SCPI commands can be used in the same message as long as
they are separated by semicolons (;). A common command can be executed at any command
level and will not affect the path pointer. Example:
:stat:oper:enab <NRf>; *ESE <NRf>
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 follow-
ing example shows how a command program message must be terminated:
:outp on <PMT>
Command execution rules
• 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 mes-
sage 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 SourceMeter is then addressed to talk, the response message is sent from the Output Queue
to the computer.
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