Agilent Technologies 87130A Query Command, Program Message Terminator, Character Program Data

Remote Operation

Programming Syntax

Character Program Data

Character program data is used to convey parameter information as alpha or alphanumeric strings.

Example ROUTE:VERIFY:ON:ALL

The :VERIFY function is specified to be ON for ALL channels.

Numeric Program Data

Some command headers require program data to be a number.

Example ROUTE:DELAY .03,(@101,103,105)

Program Message Terminator

Query Command

where the :DELAY function is specified to be 30 ms on channels 101, 103, and 105.

The program codes within a data message are executed after the program message terminator is received. The terminator may be either an NL (New Line) character, an EOI (End-Or-Identify) asserted, or a combination of the two. All three ways are equivalent. Asserting EOI sets the GPIB EOI control line low on the last byte of the data message. The NL character is an ASCII linefeed (decimal 10).

Command headers immediately followed by a question mark (?) are queries. Query commands are used to find out how the switch driver is currently configured. After receiving a query, the switch driver interrogates the requested function and places the answer in its output queue. The output message remains in the queue until it is read or another command is issued. When read, the message is transmitted across the bus to the designated listener (typically a controller).

Example The query ROUTE:PATH:VALUE? <path name> places the value of the named path in the output queue. In conjunction with this, the controller input statement:

ENTER <device selector>;Values$

passes the value across the bus to the controller and places it in the BASIC variable “Values$”.

Agilent 87130A Operating and Service Manual 4-7