Keithley 6220 User Manual

Model 6220/6221 Reference Manual Status Structure 11-5
Return to Section 11 topics
Programming and reading registers
Programming enable registers
The only registers that can be programmed by the user are the enable registers.
All other registers 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 commands are covered later in this section
(Table 11-3 through Table 11-6).
A command to program an event enable register is sent with a parameter value
that determines 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 11-1) 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 11-2 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).
Figure 11-2
16-bit status register
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>
B7
B15
B6 B5
B4
B3
B2 B1
B0
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
128
(2 )
7
32768
(2 )
15
64
(2 )
6
16384
(2 )
14
32
(2 )
5
8192
(2 )
13
16
(2 )
4
4096
(2 )
12
8
(2 )
3
2048
(2 )
11
4
(2 )
2
1024
(2 )
10
2
(2 )
1
512
(2 )
9
1
(2 )
0
256
(2 )
8
Bit Position
Bit Position
Binary Value
Binary Value
Decimal Weights
Decimal Weights
A. Bits 0 through 7
B. Bits 8 through 15
B14 B13 B12 B11 B10 B9 B8
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Keithley 6220 Specifications

General

Brand	Keithley
Model	6220
Category	Measuring Instruments
Language	English