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2.
Units of Measurement
To read the chosen units of measure for the gauge:
Send “u” (ASCII value 117); the 921 returns
Torr or mBar
3.
Set Point #1
To read the setting and status of set point #1
Send “1” (ASCII value 49); the 921 returns information for set point #1 in the format:
STUeV WXYeZ A
B
where:
STU is the multiplier and V is the exponent for set point #1 high
WXY is the multiplier and Z is the exponent for set point #1 low
A is the gauge to which the set point #1 has been assigned: either 1 or 2
B is set point relay status; 0= relay is not energized, 1=relay is energized
4.
Set Point #2
To read the setting and status of set point #2
Send “2” (ASCII value 50); the 921 returns information for set point #2 in the same format as for
set point #1, above.
5.
Model and Software Revision
To read software identification.
Send “v” (ASCII value 118); the 921 returns the model number of the instrument and the revision
number, as in the following example:
921
ver 1.02
6.
High Voltage Control: ON (version 1.08 and later only)
To turn the High Voltage On:
Send “n” (ASCII value 110); the 921 returns “OK” to acknowledge receipt of the command. The
921 turns the high voltage on and begins measurement of pressure in the same manner as if the
front panel High Voltage button had been pressed.
7.
High Voltage Control: OFF (version 1.08 and later only)
To turn the High Voltage Off:
Send “f” (ASCII value 102); the 921 returns “OK” to acknowledge receipt of the command. The
921 turns the high voltage off in the same manner as if the front panel High Voltage button had
been pressed. The 921 display will show “OFF”.
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