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Status Structure
13-5
Programming and reading registers
Programming enable registers
The only registers that can be programmed by the user are the enable registers. All other reg-
isters in the status structure are read-only registers. The following explains how to ascertain the
parameter values for the various commands used to program enable registers. The actual com-
mands are covered later in this section (see Tables 13-3 and 13-6).
A command to program an event enable register is sent with a parameter value that deter-
mines the desired state (0 or 1) of each bit in the appropriate register. An enable register can be
programmed using any of the following data formats for the parameter value; binary, decimal,
hexadecimal, or octal.
The bit positions of the register (see Figure 13-2) indicate the binary parameter value. For
example, if you wish to sets bits B4, B3, and B1, the binary value would be 11010 (where B4=1,
B3=1, B1=1 and all other bits are 0). When you use one of the other formats, convert the binary
number to its decimal, hexadecimal, or octal equivalent:
Binary 11010 = Decimal 26 = Hexadecimal 1A = Octal 32
Note that Figure 13-2 includes the decimal weight for each register bit. To set bits B4, B3 and
B1, the decimal parameter value would be the sum of the decimal weights for those bits
(16+8+2 = 26).
The <NDN> (non-decimal numeric) parameter type is used to send non-decimal values.
These values require a header (#B, #H or #Q) to identify the data format being sent. The letter
in the header can be upper or lower case. The <NRf> (numeric representation format) parameter
type is used to send decimal values, and does not use a header. The following examples show
the proper parameter syntax for setting bits B5, B3, and B2:
#b101100
Binary format (<NDN> parameter type)
#h2C
Hexadecimal format (<NDN> parameter type)
#q54
Octal format (<NDN> parameter type)
44
Decimal format (<NRf> parameter type)
Valid characters for the non-decimal parameter values are shown as follows:
<NDN> Format
Valid Characters
Binary
1’s and 0’s
Hexadecimal
0 through 9 and A through F
Octal
0 through 7
Содержание 6514
Страница 203: ...14 CommonCommands...
Страница 207: ...15 SCPISignalOriented MeasurementCommands...
Страница 235: ...18 PerformanceVerification...
Страница 254: ...19 Calibration...
Страница 274: ...20 RoutineMaintenance...
Страница 278: ...A Specifications...
Страница 282: ...B StatusandErrorMessages...
Страница 288: ...C GeneralMeasurement Considerations...
Страница 294: ...D DDCEmulationCommands...
Страница 299: ...E ExamplePrograms...
Страница 306: ...F IEEE 488BusOverview...
Страница 320: ...G IEEE 488andSCPI ConformanceInformation...
Страница 324: ...H CalibrationOptions...