INFICON LDS3000 Modular Leak Detector Interface description - Manual (Page 21)

LDS1000 Protocol 21
3.2.4 Entry of Instrument Settings
The settings of parameters in the control modus "RS232" may be changed via the
command "U" for update when the jumper XJ1 has been set to RS232. The parame-
ters may be output via the serial interface through the command "Q" for query.
Forexample, "U0, 1.0E-4<cr>" changes the level for the first trigger to 1.0x 10-4.
Through "Q0<cr>" the trigger level can be read.
The settings are each explained in the Technical Handbook jina50e1-a.
In order to use the commands U51 to U66 the password needs to be entered.
G8
Electronics temperature (ELTA) in
°C
e.g.: 23.5
G9
Amplifier temperature (EVSTA) in
°C
e.g.: 29,2
G10 Anode potential (MIAP) in volts. e.g.: 457
G11 Cathode potential (MIKP) in volts. e.g.: 378
G12
Suppressor potential (MISP) in
volts.
e.g.: 330
G13
Anode-Cathode potential (MIAKP)
in volts.
e.g.: 79
G19
Speed of the turbopump (TMP) in
Hz.
e.g.: 1048
Command Meaning Representation
Command Meaning Representation
Q/U0 Trigger 1 in current unit e.g.: 1.0E-5
Q/U1 Trigger 2 in current unit e.g.: 1.0E-5
Q/U2 Trigger 3 in current unit e.g.: 1.0E-5
Q/U3 Trigger 4 in current unit e.g.: 1.0E-5
Q4 Output the operating mode
x, y (always 2 signs)
X: 0 – SPS, 1 - RS232
Y: 0 – VAC. 1 - SNIFF
U4
Select operating mode This setting
is not saved when switching the
mains power off.
0 - VAC
1 - SNIFF
Q/U7
Sensitivity Threshold. Leak rate in
current unit at which the sensitivity
(averaging time) is
switched over.
e.g.: 1.0E-10
Q/U8
Zero time in seconds (period of
time for which the leak rate signal
must remain below the saved
background level until the saved
background level itself is
corrected).
e.g.: 5
Q10 Always 0
Q11 Limit-Low in current unit e.g.: 1.0E-8
Q12 Limit-HIGH in current unit e.g.: 1.0E4
Q/U13 Machine factor for VAC e.g.: 1.0E0