C: Status model Model 2461 Interactive SourceMeter® Instrument
C-16 2461-901-01 A/November 2015
Understanding bit settings
When you write to or read a status register, you can use binary, decimal, or hexadecimal values to
represent the binary values of the bit states. When the value is converted to its binary equivalent, you
can determine which bits are set on or clear. Zero (0) indicates that all bits are clear.
In the Model 2461, the least significant bit is always bit B0. The most significant bit differs for each
register, but in most cases is either bit B7 or bit B15.
Bit position
Binary value
1000
0100
0010
0001
1000 0100 0010 0000
Decimal value
Weight
2
2
2
2
2
2
2
2
Bit position
Binary value
1000
0000
0000
0100
0000
0000
0010
0000
0000
0001
0000
0000
1000
0000
0000
0100
0000
0000
0010
0000
0000
0001
0000
0000
Decimal value
32768 16384 8192 4096 2048 1024 512 256
Weight
2
2
2
2
2
2
2
2
For example, if a value of 1.29000e+02 (which is 129) is read as the value of the condition register,
the binary equivalent is 0000 0000 1000 0001. This value indicates that bit B0 and bit B7 are set and
all other bits are cleared.
For example, if you read a value of 1.22880e+04 (12,288) for the condition register, the binary
equivalent is 0011 0000 0000 0000. This value indicates that bits B12 and B13 are set.
When bit B12 (4096) and bit B13 (8192) are set (1), the decimal equivalent is 4096 + 8192 = 12,288.
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