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3.3.1. Screen Orientation
The top of the screen is indicated and will rotate 90° each time the screen is pressed.
3.3.2. Set Zero
The Set Zero menu will set the pressure reading to zero and should only be done if the actual pressure
is known to be well below 0.1 Torr. If the pressure reading is too large, a warning screen will appear
asking if the user is certain they want to do this operation.
3.3.3. Device Info
The user may view the serial number, analog output setting, calibration date, gauge type, and the I/O
and main board firmware revision levels.
3.3.4. Analog Output
The user may select 0 – 1 V, 0 – 5 V, 0 – 10 V, 0 – 20 mA or 4 – 20 mA.
3.3.5. Serial Port
The user may select either RS232 or RS485 serial communications. After selecting the type, pressing
the arrow icon will take the user to the baud rate selection There are 5 baud rates available: 9600,
19200, 38400, 57600 and 115200. If RS485 was selected, additional sub-menu screens will appear
allowing the user to select the address and termination resistor state. At the end of the selection sub-
menus, the user can accept or canel the selections shown.
3.3.6. Restore Factory Defaults
This selection allows the user to reset the configuration of the gauge back to its original factory setup.
A warning screen will appear asking if the user is certain they want to perform this operation.
HVG-2020A Instruction Manual
Page 17 of 29
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