Granville-Phillips Micro-Ion 354 E Series, Instruction Manual, Page: 33 / 54

RS–232 Operation
Micro-Ion E Module Instruction Manual 354011, Rev. A
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SO Set Overpressure Limit
Send the set overpressure value (SO) command to set the highest pressure
at which the Micro-Ion E gauge will operate. The value represented by the
SO command is the pressure, in Torr, at which the Micro-Ion E gauge shuts
OFF with increasing vacuum pressure.
Example SO command from host: SO1.50E–03
↵
Response from module: PROGM OK
↵
The example SO command causes the Micro-Ion E gauge to shut OFF when
vacuum pressure increases to 1.5 x 10
–3 Torr (1.99 x 10 –1 Pa, 1.99 x 10 –3
mbar). The highest valid overpressure limit is 1 x 10
–2
Torr (1.33 Pa,
1.33 x 10 –2 mbar).
RST Reset Module to
Programmed Values
The reset (RST) command restores the user-programmed baud rate and
overpressure limit to the module non-volatile memory (NVRAM).
RST command from host: RST
↵
Response from module: None
• Sending the RST command has the same effect as cycling power to the
module.
• Communication is re-enabled two seconds after you’ve sent the RST
command.
• You must send the RST command immediately after you’ve sent the FAC
command. See page 30.
RS Read Module Status
Send the read status (RS) command to read the module operating status.
RS command from host: RS
↵
Example response from module: 00 ST OK
↵
Table 5-9 lists module responses to the RS command.
Table 5-9 Module Status Responses
Response Description
08 POWER • Module is starting up.
• The “00_ST_OK” string will be generated next if the
module is operating properly.
00 ST OK Module is operating normally.
01 OVPRS Micro-Ion E gauge has shut OFF due to overpressure
condition.
02 EMISS • Micro-Ion E gauge emission failure.
• Cycle power to module to clear status response.
04 HIVLT • Micro-Ion E gauge grid voltage failure.
• Cycle power to module to clear status response.