INFICON LDS3000 Modular Leak Detector Interface description - Manual (Page 17)

LDS1000 Protocol 17
Through the reset character <ESC> (27d or 1Bh) without <cr> the interface of the
LDS 1000 may be reset back to a defined state. A received string which might be
processed at that moment is erased and its processing is terminated. Receiving of
the <ESC> character is acknowledged by "OK<cr>" (In the case of the "TERMINAL"
program from Microsoft the character "O" is not displayed when the local echo is on).
Thereafter, the interface is ready to receive. Through this character its is easily
possible to check whether or not the data link has been properly installed.
3.2.1 Main functions
X1*)
Calibration: In the STANDBY mode, the internal calibration is started.
In the MEASURE mode, the external calibration is started. The status of the external
calibration may be queried through S12. Sequence of commands for external calib-
ration:
The internal calibration process is run automatically. There after, the LDS3000 will
be in the STANDBY mode.
Command Meaning
Reply
from the
LDS1000
Equivalent to key
or PLC input
LR Leak rate, date, time, output status
START
Start measurement mode,
suppress the background which
was measured upon operating
START
OK MEAS active
STOP
Stop the measurement mode,
display the current background
level
OK MEAS inactive
ZERO
ZERO mode on, suppress the
background which was measured
upon operating ZERO
OK ZERO active
ZERO OFF
ZERO mode off, display the
background which was measured
upon operating ZERO
OK ZERO inactive
CAL x1) Internal/external calibration OK CAL
CLEAR
Interrupt calibration/erase error
status
OK CLEAR active
Command
Reply
from the
LDS1000
Meaning
1 START OK
The LDS1000 enters the measurement
mode, the calibrated leak must be opened,
wait until the signal has stabilised.
2 CAL OK External calibration is being started.
3 S12 1 External calibration is running.
4 S12 2
Calibrated leak must be closed, wait until
the signal is stable.
5 CAL OK Calibration is continued.
6 S12 0
Calibration complete, the LDS1000 is in
the measurement mode, the instrument is
running in the MEASUREMENT mode.