Keithley 6430 User Manual

Status Structure 14-5
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 (Tables 14-3 and 14-6).
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 (Figure 14-2) indicate the binary parameter value. For exam-
ple, 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 14-2 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).
(2
7
) (2
6
) (2
5
) (2
4
) (2
3
)
(
2
2
)
(
2
1
) (2
0
)
(
2
15
) (2
14
)
(
2
13
) (2
12
) (2
11
) (2
10
) (2
9
) (2
8
)
Bit Position
Binary Value
Decimal
Weights
B7
B6
B5
B4
B3
B2
B1
B0
0/1
0/1 0/1
0/1 0/1 0/10/10/1
128
64
32
16
8
4
2
1
B15 B14 B13 B12 B11 B10 B9 B8
32768
16384 8192 4096 2048 1024 512 256
0/1
0/1 0/1
0/1 0/1 0/10/10/1
Bit Position
Binary Value
Decimal
Weights
B) Bits 8 through 15
A) Bits 0 through 7
Figure 14-2
16-bit status
register

Keithley 6430 Specifications

General

Brand	Keithley
Model	6430
Category	Measuring Instruments
Language	English