User manual

14-12 Remote Operations 2400 Series SourceMeter
®
User’s Manual
• When the path pointer detects a colon (:) that immediately follows a semi-
colon (;), it resets to the root level.
• The path pointer can only move down. It cannot be moved up a level. Exe-
cuting a command 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 mes-
sage 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 following example shows how a multiple 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 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 SourceMeter is then addressed to talk, the response message
is sent from the Output Queue to the computer.