HP 132A, 53131A Response Messages, Response Message Syntax, Overview of Response Message Formats, Figure 3-5.Simplified Response Message Syntax Diagram

Chapter 3 Programming Your Universal Counter for Remote Operation

Overview of Response Message Formats

Overview of Response Message Formats

Response Messages

Response messages are data sent from the Counter to a computer in response to a query. (A query is a command followed by a question mark. Queries are used to find out how the Counter is currently configured and to transfer data from the Counter to the computer.)

After receiving a query, the Counter interrogates the requested configuration and places the response in its HP-IB output queue.

The output message remains in the qu eue until it is read or another command is issued. When read, the message is transmitted across the HP-IB to the computer. You read the message by using some type of enter statement that includes the device address and an appropriate variable. Use a print statement to display the message. The following HP BASIC example illustrates how to query the Counter and display the message:

10OUTPUT 703;":INP:COUP?"

20ENTER 703; A$

30PRINT A$

40END

Response Message Syntax

Figure 3-5 shows the simplified syntax of a Response Message. Response messages may contain both commas and semicolon separators. When a single query command returns multiple values, a comma is used to separate each item. When multiple queries are sent in the same program message, the groups of data corresponding to each query are separated by a semicolon. Note that a <new line> ^END is always sent as a response message terminator.

NOTE:

<new line> = ASCII character decimal 10 ^END = EOI asserted concurrent with last byte

; = multiple response separator (ASCII character decimal 59)

, = data separator within a response (ASCII character decimal 44)

Figure 3-5. Simplified Response Message Syntax Diagram

3-16 Programming Guide