.3 Introduction for the GP-IB
The data received or sent by the GP-IB interface is called messages. They are
classified as follows.
These messages have two sorts. One is the program messages which send the
messages from the controller to the unit, and another is the response
messages which send messages from the unit to the controller.
(1) Program messages
The program messages are able to be divided into the command messages and
the query messages.
The command messages are the orders which control the unit, such as the
settings or the reset of the unit.
The query messages are the orders which query the operation results, such as
the measurement results or the setting state of the unit.
The 3227 returns to the original measurement mode automatically, when
receives the program message in the each setting mode, such as the
comparator setting mode.
(2) Response messages
The response messages are produced when receiving the query messages and
checking the syntax. As far as the header is OFF, the semicolon ";"of the
message unit separator of the response message is able to change to the
comma "," with "TRANsmit:SEPArator" command. When turning on the
power supply, it is the semicolon ";".
Headers on ":TC ON;:HOLD ON"
Headers off "ON;ON"
Headers off "ON,ON"
" " means a space.
In case of some errors are generated when the query is sent, the response
messages of that query are not produced.
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