2 aom, 3 bau, 4 com – INFICON VGC403 Three-Channel Measurement and Control Unit User Manual
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tinb07e1-e 2011-07 Vacuum Gauge Controller
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6.3.2
AOM
Analog output mode. Characteristic curve of the recorder 
output. See Chapter 5.3.5 Recorder output (Ao),  27.
S: AOM[,a,b]
R: 
S: 
R: a,b
6.3.3
BAU
Baud rate. Transfer rate of the RS232C interface. See 
Chapter 5.3.2 Baud rate (bAud),  27.
S: BAU[,a]
R: 
S: 
R: a
NOTE:
The acknowledgement of the BAU command will al-
ready be sent with the changed transfer rate.
6.3.4
COM
Continuous mode. Continuous transmission of measure-
ments to the serial interface.
S: COM,a
R: 
The acknowledgement is immediately followed by the 
continuous measurement transmission. The measure-
ments are always output in the exponential format.
R: b,±c.ccccE±cc,d,±e.eeeeE±ee,f,±g.ggggE±gg 
Parameter
Significance
a
Channel number
0 = Channel 1
1 = Channel 2
2 = Channel 3
b
Characteristic curve
0 = Logarithmic LoG 
1 = Logarithmic LoG A 
2 = Logarithmic LoG -6 
3 = Logarithmic LoG -3 
4 = Logarithmic LoG +0 
5 = Logarithmic LoG +3 
6 = Logarithmic LoGC1 
7 = Logarithmic LoGC2 
8 = Logarithmic LoGC3 
9 = Linear Lin -10
10 = Linear Lin -9 
11 = Linear Lin -8 
12 = Linear Lin -7 
13 = Linear Lin -6 
14 = Linear Lin -5 
15 = Linear Lin -4 
16 = Linear Lin -3 
17 = Linear Lin -2 
18 = Linear Lin -1 
19 = Linear Lin +0 
20 = Linear Lin +1 
21 = Linear Lin +2 
22 = Linear Lin +3 
23 = iM221 
24 = Logarithmic LoGC4 
25 = PM411 
Parameter
Significance
a
Transfer rate
0 = 9600 baud (default)
1 = 19200 Baud
2 = 38400 Baud
Parameter
Significance
a
Period
0 = 100 milliseconds
1 = 1 second (default)
2 = 1 minute
b
Status of channel 1
0 = Measurement data ok
1 = Underrange
2 = Overrange
3 = Sensor error
4 = Sensor switched off
5 = No sensor
6 = Identification error
7 = BPG/BCG/HPG error
±c.ccccE±cc
Reading of sensor 1 in current unit 
of measurement
d
Status of channel 2
(see above)
±e.eeeeE±ee
Reading of sensor 2 in current unit 
of measurement
f
Status of channel 3
(see above)
±g.ggggE±gg
Reading of sensor 3 in current unit 
of measurement
