D U N I W A Y S T O C K R O O M C O R P .
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Displayed Pressure
Serial Output
OFF
Off
LO
Low
0.000 mTorr
0.000e-3
0.800 mTorr
0.800e-3
2.800 mTorr
2.800e-3
-1.600 mTorr
-1.600e-3
57.10 mTorr
57.10e-3
2.340 torr
2.340e+0
105.0 torr
105.0e+0
4115 torr
4115e+0
HI
9999e+0
Figure 15: Serial Output and Displayed Pressure
Since both gauges are maintained in an active state, pressure data taken over the serial port are
valid for both gauges at the same time, regardless of which gauge is shown on the digital display.
2. Full Scale Of The Gauges
To read the full scale range selected during set up for each gauge
Send “f” (ASCII value 102); the 908A returns full scale which the user has selected for each
gauge in the format:
JKLM
e
N OPQR
e
S
where
JKLM
is the multiplier and
N
is the exponent for CDG #1
OPQR
is the multiplier and
S
is the exponent for CDG #2
Some examples follow:
Full Scale
Serial Outpu
t
50 mTorr
50.00e-3
100 mTorr
100.0e-3
1 Torr
1.000e+0
100 Torr
100.0e+0
1000 Torr
1000e+0
10000 Torr
10.00e+3
Figure 16: Serial Output and Full Scale Range Setting
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