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HVG-2020B Instruction Manual
2.3.4. Setpoints
The HVG-2020B has two open-drain setpoints available on the 9 pin D connector. The Hi setpoint will be active
when the pressure is above its set value and the Lo setpoint will be active when the pressure is below its set
value. There is a small amount of hysteresis built into the settings. Once a setpoint is activated, the pressure
must go 10% beyond that value in the opposite direction to deactivate when below 10 Torr. Above 10 Torr, the
pressure must go 1 Torr beyond the setpoint value.
The set point values can be changed via the display (Setpoint View, Section 3.2) or serial communications (see
S20 and S21 commands). The setpoints will also show on the Bar Graph View as up and down arrows.
NOTICE: To utilize the open drain setpoint pins, external pull-up resistors larger than 1 kΩ are required.
Do not apply more than 5 volts to the setpoint pins.
EAR99 Technology Subject to Restrictions Contained on the Cover Page
Page 17 of 40
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