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HVG-2020B Instruction Manual
S28
Piezo Span (Factory Read/Write)
The pressure at which the Piezo sensor span was set.
S31
Analog Output Type (Read/Write)
Change the type of analog output. It is a 2-digit hex number, with the first digit used for
changing the type of analog output. The second digit is only used for logarithmic outputs.
Options are as follows:
The "X" denotes that it does not matter what is put there. The logarithmic option has 7
predefined slope/span selections, and 1 custom option. The numbers for the custom option
can be set with S32 and S33. The selections are as follows:
S32
Analog Log Span (Read/Write)
This sets the logarithmic span for the custom analog output (selection 6 only).
S33
Analog Log Slope (Read/Write)
This sets the logarithmic slope for the custom analog output (selection 6 only).
S36
Analog Output (Zero Pressure) (Read Only)
The Analog Output voltage or current value which is output when the pressure is at 0% of
full scale. This is controlled by S64 Product Config.
S37
Analog Output (FS Pressure) (Read Only)
The Analog Output voltage or current value which is output when the pressure is at 100% of
full scale. This is controlled by S64 Product Config.
S51
DAC Zero Code (Factory Read/Write)
The Analog Output D/A value used to represent 0.00001 Torr pressure. If in CALIBRATE
state (SS8), writes value to RAM and Sets the Analog Output to the level representing 0
pressure; otherwise, writes value to RAM and FLASH
Range is 0 to 65535. Defaults are as follows:
0 to 5 V, 0 to 10 V
1 to 5 V
0 to 20 mA
4 to 20 mA
EAR99 Technology Subject to Restrictions Contained on the Cover Page
0x0X = Logarithmic
0x1X = Linear
0x2X = NonLinear
0x3X = Dual Slope
0x00 = Span:9V @1000Torr, Slope:1V/Dec
0x01 = Span:8V @1000Torr, Slope:1V/Dec
0x02 = Span:8.6249V @1000Torr, Slope:1V/Dec
0x03 = Span:10.1608V @1000Torr, Slope:1.286V/Dec
0x04 = Span:20mA @1000Torr, Slope:2mA/Dec
0x05 = Span:20mA @1000Torr, Slope:2.5mA/Dec
0x06 = Span: CUSTOM, Slope: CUSTOM
32764
35742
0
10950
Page 34 of 40
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