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Introduction to Programming
Program Message Syntax
Header Types
There are three types of headers:
·
Simple Command headers.
·
Compound Command headers.
·
Common Command headers.
Simple Command Header Simple command headers contain a single
mnemonic. AUTOSCALE and DIGITIZE are examples of simple
command headers typically used in this instrument. The syntax is:
<program mnemonic><terminator>
Simple command headers must occur at the beginning of a program message;
if not, they must be preceded by a colon.
When program data must be included with the simple command header (for
example, :DIGITIZE CHAN1), white space is added to separate the data from
the header. The syntax is:
<program mnemonic><separator><program data><terminator>
Compound Command Header Compound command headers are a
combination of two program mnemonics. The first mnemonic selects the
subsystem, and the second mnemonic selects the function within that
subsystem. The mnemonics within the compound message are separated
by colons. For example:
To execute a single function within a subsystem:
:<subsystem>:<function><separator><program data><terminator>
(For example :CHANNEL1:BWLIMIT ON)
Common Command Header Common command headers control IEEE
488.2 functions within the instrument (such as clear status). Their
syntax is:
*<command header><terminator>
No space or separator is allowed between the asterisk (*) and the command
header. *CLS is an example of a common command header.
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