Chapter 6, COMPUTER OPERATION
6-23
n
2
Signal (DAC2)
0 Y1 % (2.5 V FS)
1 Noise % (2.5 V FS)
2 Ratio: (10 × X1%/ADC 1)
3 Log Ratio: log
10
(10 X1%/ADC1)
4 Equation 1
5 Equation 2
6 User DAC2
7 Ext ADC1 monitor
8 Phase2 : +9 V = +180°, -9 V = -180° (dual mode only)
n
2
Signal (DAC3)
0 Magnitude1 % (2.5 V FS)
1 Noise % (2.5 V FS)
2 Ratio: (10 × X1%/ADC 1)
3 Log Ratio: log
10
(10 X1%/ADC1)
4 Equation 1
5 Equation 2
6 User DAC3
7 Input to second demodulator (digital signal monitor 2)
8 X2 % (2.5 V FS) (dual mode only)
n
2
Signal (DAC4)
0 Phase1: +9 V = +180°, -9 V = -180°
1 Noise % (2.5 V FS)
2 Ratio: (10 × X1%/ADC 1)
3 Log Ratio: log
10
(10 X1%/ADC1)
4 Equation 1
5 Equation 2
6 User DAC4
7 Synchronous oscillator
8 Y2 % (2.5 V FS) (dual mode only)
NOTE: n
2
= 1 is only permitted if the noise measurement mode is on
(NOISEMODE 1) or if the present settings of output filter slope and time constant
are within the permitted range and the synchronous time constant control is off.
DAC[.] n
1
[n
2
] Set user DAC output voltage controls
The first parameter n
1
, which specifies the DAC, is compulsory and is either 1, 2, 3
or 4.
The value of n
2
specifies the voltage to be output.
In fixed point mode it is an integer in the range -10000 to +10000, corresponding to
voltages from -10.000 V to +10.000 V, and in floating point mode it is in volts.
6.7.08 Digital I/O
PORTDIR [n] Digital port direction control
The value of n determines which of the eight lines on the digital port are configured
as inputs and which as outputs. The parameter n is a decimal number whose bit-wise
interpretation defines whether the corresponding line is an input or output. The line
is an input if the corresponding bit is a “1”. For example:
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