Message Syntax

Program messages are sent to the 801G* using four character ASCII upper/lower case headers. These headers can be either commands or queries. Com- mands are messages which do not require a response from the 801G*. Queries are messages which cause the 801G* to respond with the required data.

Separator ( ; )

Message

Terminator

Program Message Syntax

Separator

( ; )

Command/Query

Separator

Data

Header

(white space)

Message Unit Syntax

Commands

Command headers instruct the 801G* to set a pa- rameter to the value given or perform some func- tion not requiring any additional data. Commands which have an asterisk (*) as their first character are common commands as defined by the IEEE-488.2 stan- dard and generally operate the same in all instru- ments. See the listing at the end of this section for descriptions of each common command.

Command headers which do not require any addi- tional data from the controller are self-contained and should be followed by either a message separator

(;)or message terminator. Any other characters (ex- cept whitespace characters) will cause a command error.

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Quantum Data 801GC, 801GF, 801GX manual Message Syntax, Commands