User manual

32
for the new message, the device will hold off putting the message in the queue until there is
place for it.
4.3.3 Response Messages
The device sends a Response Message in response to a valid query. All queries return a
single Response Message Unit.
4.4 Instrument Identification
The *IDN? common query is used to read the instrument's identification string. The
string returned is as follows:
BK, MODEL 4040B,0,V0.1
The “V0.1” reflects the firmware version number and will change accordingly.
4.5 Instrument Reset
The *RST common command effects an instrument reset to the factory default power up
state.
4.6 Command Syntax
4.6.1 General Command Structure
A Program Message is defined as a string containing one Program Message Units, which is an
instrument command or query. The Program Message is terminated by the Program Message
Terminator.
The Program Message Terminator consists of optional white space characters, followed by the
Linefeed (LF) character (0x0A).
The Program Message Unit can be divided into three sections as follows:
a) Program Header
The Program Header represents the operation to be performed, and consists of ASCII
character mnemonics. Two types of Program Headers are used in the MODEL 4040B:
Instrument-control headers and Common Command and Query headers. Common Command
and Query Program Headers consist of a single mnemonic prefixed by an asterisk ('*').