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HVG-2020B Instruction Manual
5.2.8.4. Sensor List Commands
SL
Sensor List (Read Only)
Returns all items in the Sensor List
SFL
System Full List
Returns all system variables for use in problem determination.
S1
Model (Read Only)
Returns the Model and Software Version of the device.
S5
Device Address (Read/Write)
Address used for RS485 mode addressing. This is a hex number which accepts values from
0x01 to 0x98 and 0x9A to 0xFF; 0x99 is the BROADCAST ADDRESS - all devices process this
message, but do not respond unless the command is S5.
NOTE: The command *99S5 should be used with one single device attached to the RS485
bus. This allows discovery of the current address of a device when it is not known.
S14
Number of Decimal Places (Read/Write)
The number of decimal places displayed for floating point values. Valid values are 0 to 7.
This setting is reflected in the lower 3 bits of S2.
S15
Piezo Zero Value (Read/Write)
The piezo sensor zero value in counts. Changing this value can be used to adjust the zero-
pressure indication even when at higher pressures.
S16
Piezo Slope Value (Read Only)
The piezo sensor slope in Torr/count
S18
Sensor Temperature (Read Only)
The current sensor board temperature
S20
Low Relay Set Point (Read/Write)
This is the value below which the low setpoint will become active. Same as L command.
S21
High Relay Set Point (Read/Write)
This is the value above which the high setpoint will become active. Same as H command.
S22
Pressure units (Read/Write)
Returns the current pressure unit name in text. Same as the U command. To set the
pressure unit that the gauge is displaying, a numeric value is used as follows:
EAR99 Technology Subject to Restrictions Contained on the Cover Page
1 = TORR
2 = MBAR
3 = KPA
4 = PSIA
5 = PSIG
6 = ATM
7 = BAR
8 = PA
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