SRS Labs QMS 100 Series, User Manual

Page: 180 / 280

3-56 RGA Command Set
SRS QMS Gas Analyzer
ED?
Error checking:
The only acceptable parameter is a question mark.
The absence of a parameter (i. e. ED) is treated as a bad-parameter error.
EF?
Description : FIL_ERR Byte Query
Echo: FIL_ERR Byte.
Query the value of FIL_ERR.
The FIL_ERR byte value is returned to the computer in ASCII format and with a <LF> terminator.
FIL_ERR can only be modified by the “Filament Protection Mode” which constantly monitors the filament
while it is emitting electrons. No errors are present as long as the byte value is zero. A non-zero
FIL_ERR byte is only cleared after the filament’s heater succesfully (i.e. no detected errors) establishes a
finite electron emission current.
Consult the Error Byte Definitions section of this chapter for detatils on the different error bytes of the
RGA.
Consult the RGA Troubleshooting chapter of this manual for possible causes and solutions to any problems
reported.
Parameters: This command is a query, and can only have one parameter format:
EF?
Error checking:
The only acceptable parameter is a question mark.
The absence of a parameter (i. e. EF) is treated as a bad-parameter error.
EM?
Description : CEM_ERR byte Query
Echo : CEM_ERR Byte.
Query the value of CEM_ERR.
If no electron multiplier (CDEM) is available, the absence of the CDEM is reported setting bit 7 of
CEM_ERR before the byte value is transmitted.
In all cases, the CEM_ERR byte value is sent to the computer in ASCII format with a <LF><CR>
terminator. CEM_ERR and Bit 3 of STATUS are then cleared.