Appendix E, ALPHABETICAL LISTING OF COMMANDS
E-4
Bit Decimal value Output and range
6* 64 Ratio (±10000 FS)
7* 128 Log ratio (-3000 to +2000)
8* 256 ADC1 (±10000 = ±10.0 V)
9* 512 ADC2 (±10000 = ±10.0 V)
10* 1024 ADC3 (±10000 = ±10.0 V)
11* 2048 ADC4 (±10000 = ±10.0 V)
12* 4096 DAC1 (±10000 = ±10.0 V)
13* 8192 DAC2 (±10000 = ±10.0 V)
14 16384 EVENT variable (0 to 32767)
15 32768 Reference Frequency bits 0 to 15 (millihertz)
16 65536 Reference frequency bits 16 to 31 (millihertz)
Dual modes only:-
17 131072 X
2
Output (±10000 FS)
18 262144 Y
2
Output (±10000 FS)
19 524288 Magnitude2 Output (0 to +10000 FS)
20 1048576 Phase
2
Output (±18000 = ±180°)
21 2097152 Sensitivity
2
setting (1 to 27) + IMODE
(0, 1, 2 = 0, 32, 64)
100,000 points are available for data storage in the standard curve buffer mode,,
shared equally between the specified curves. For example, if 16 outputs are stored
then the maximum number of storage points would be 6250 (i.e. 100000/16). The
only exception to this rule is that the Frequency curve (curves 15 and 16) occupies
the equivalent of any two other curves. The LEN command sets the actual curve
length, which cannot therefore be longer than 100000 divided by the number of
curves selected. If more curves are requested than can be stored with the current
buffer length, then the buffer length will be automatically reduced. Its actual length
can of course be determined by sending the LEN command without a parameter.
The reason why bit 4 and, for dual reference modes, bit 21, which store both the
sensitivity and the IMODE setting, are needed, is to allow the instrument to transfer
the acquired curves to the computer in floating point mode. Without this information,
the unit would not be able to determine the correct calibration to apply.
Note that the CBD command directly determines the allowable parameters for the
DC, DCB and DCT commands. It also interacts with the LEN command and affects
the values reported by the M command.
Since the reference frequency requires 32-bit wide data points, it occupies two curve
positions. For ease of use, if bit 15 is selected for storage then bit 16 will be
automatically selected as well, and vice-versa.
NOTE: At least one of the curves selected for storage in the curve buffer must be
chosen from those marked with an asterisk(*) in the above table.
CH n
1
[n
2
] DAC analog output control
Defines what outputs appear on the DAC1, DAC2, DAC3 and DAC4 connectors on
the rear panel.
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