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14-5
IM 760401-01E
Communication Commands 2 (System of Commands Complying to the IEEE 488.2-1992 Standard)
14
Dead Lock
This instrument has a buffer memory in which both
program and response messages of 1024 bytes or
more can be stored (The number of bytes available will
vary depending on the operating state of the
instrument). If both buffer memories become full at the
same time, this instrument becomes inoperative. This
state is called dead lock. In this case, operation can
be resumed by discarding the response message.
No dead lock will occur, if the size of the program
message including the PMT is kept below 1024 bytes.
Furthermore, no dead lock will occur if the program
message does not contain a query.
14.2.3 Commands
There are two types of command (program header)
which can be sent from the controller to this
instrument. They differ in the format of their program
headers.
They are
• Common command header
• Compound header
Common Command Header
Commands defined in IEEE 488.2-1992 are called
common commands. The header format of a common
command is shown below. An asterisk (*) must always
be attached to the beginning of a command.
∗
<Mnemonic> ?
An example of a common command
*CLS
Compound Header
Commands designed to be used only with this
instrument are classified and arranged in a hierarchy
according to their function. The format of a compound
header is illustrated below. A colon (
:
) must be used
when specifying a lower-level header.
:
<Mnemonic> ? :
An example of a compound header
CONFIGURE:MODE RMS
Note
A mnemonic is a character string made up of alphanumeric
characters.
Consecutive Commands
Command Group
A command group is a group of commands which have
the same compound header. A command group may
contain sub-groups.
Example Commands relating to integration
INTEGRATE?
INTEGRATE:MODE
INTEGRATE:TIMer
INTEGRATE:STARt
INTEGRATE:STOP
INTEGRATE:RESet
14.2 Program Format