Operation Model 8642A/B
Data Output (cont'd)
Output
Active
Function
(OA) Output Active Function enables the Signal Generator to output the setting of a selected
active function over HP-IB. The Signal Generator outputs a string that can be directly
read into a numeric variable or into a string variable which includes the HP-IB codes for
both the function and its units specifier (maximum of 19 characters).
Following is a programming example in BASIC for outputting the active function (OA):
Output the RF frequency setting as either a numeric value or a string from the Signal
Generator (address 19). ("OA" should be preceded by the function's HP-IB code.)
To output the numeric value:
10 OUTPUT 719; "FROA"
20 ENTER 719; V ! Value is output in Hz
To output the alphanumeric character string:
10 OUTPUT 719; "FROA"
20 ENTER 719; A$
The functions and values that can be output over HP-IB using "OA" are listed below along
with some format parameters.
Meanings of Values That Could Be Output
-200 indicates the function is off.
-201 indicates RF.OFF. (for amplitude only).
-202 indicates reverse power is tripped (for amplitude only).
A space character is placed before and after the numeric portion of the string.
Output String Formats
Table 3-4, Output Active Function String Formats (on the following page), lists the output
format for each active function string.
The meanings of symbols in Table 3-4 are as follows.
s = sign character, either "+" or "-"
d = digit (Leading zero digits greater that the one's digit are suppressed.)
Comments
If a function's value is in relative units, the displayed, relative setting (not the absolute
setting) will be output. You can output absolute units by converting from relative units to
absolute units before outputting the active function. Refer to page 3-205 for amplitude
units conversion information.
"OA" can be sent without a function prefix. The first two characters in the output string
will designate the active function. If the Signal Generator does not have an active
function when it receives "OA" without a function prefix, it will output the display string
(which is the default HP-IB output).
3-18
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