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Data Entry Via HP-IB
A data entry through the HP-IB must meet the same requirements as a front panel DATA entry. It must have a
number (value) and a message that terminates the entry, signaling the analyzer to assign the function value.
The number code within the quote field must be a string of (ASCII) decimal numbers plus an optional decimal
point. It may be preceded by a minus or plus sign. If the decimal is not included in the entry, the decimal point is
assumed to be at the end of the number. Either fixed or floating point notation may be used to make number
entries. For example, the entries "123E6", "12.3e6" and "12300000" each enters the same number. Exercise
caution when using the "E" exponent format, since several marker command mnemonics also begin with E.
The number of significant digits accepted and stored by the analyzer is dependent upon which function is active.
For example, an entry of 11 significant digits for center frequency can be stored in the analyzer's center frequency
register.
If no number is entered, a "1" is assumed.
Terminating the Data Entry
The units code is the most common data entry terminator. It sets the value units and enters the function value.
Code
Frequency
HZ
HZ
KZ
MHz
MZ
GZ
Other than the units codes, some ASCII codes can be used to terminate a data entry.
Symbol
8 P r o g r a m m i n g
UNIT CODES
Power
Code
DM
- D M
DB
ASCII Codes Which Terminate a Numeric Data Entry
Name
comma
carriage return
LF
line feed
semi-colon
end
Voltage
Code
M V
Decimal Equivalent
of text
Time
Code
SC
MS
US
(ASCII)
44
13
10
5 9
3
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