INFICON LDS3000 Modular Leak Detector Interface description - Manual (Page 22)

22 LDS1000 Protocol
Q/U14 Correction factor for SNIFF e.g.: 1.0E0
Q/U16
Operating mode for ext. CAL The
setting is not saved when switching
off the mains power.
0 - with autotune
1- dyn. CAL without autotune
Q/U19
Request for CAL (Enable CAL
message for a temperature
difference of 5° C).
0 - off
1 - on
Q/U20
Mass of the gas which is detected
in the mass spectrometer 2 , 3, 4
e.g.: 4
Q/U21 Date
e.g.: 24.Nov04
Abbreviations for the months:
Jan May Sep Feb Jun Oct Mar
Jul Nov Apr Aug Dec
Q/U22 Time e.g.: 14:40:07
Q/U24 Unit (unit of measurement for
pressure and leak rate in VAC
and SNIFF)
ppm and g/a is not available for
VAC
0 - mbar and mbar l/s
1 - Pa and Pa m
3 /s
2 - atm and atm cc/s
3 - mbar and g/a
4 - mbar and ppm
5 - Torr and Tor l/s
Q/U27 Leak rate of the internal
calibrated leak (always in mbar
l/s e.g.: 1.0E-7
9.9E-1 for not available
Q/U28 leak rate of the external
calibrated leak e.g.: 1.0E-5
9.9E-1 for not available
Q/U31 Number of suppressed decades 0 - 1 to 2 decades
1 - 2 to 3 decades
2 - 3 to 4 decades
3 - 2 decades
4 – complete value
5 - 19/20 of value
Q/U32 Zero suppression when START
0 - off
1 - on
U45
Compatibility
Mode 2 – LDS2010-Mode
3 – LDS3000-Mode
Q/U56 Factor 500G - 15G
Q/U57
MSV anode potential for masse 2
in volts
e.g.: 890
Command Meaning Representation