INFICON LDS3000 Modular Leak Detector Interface description - Manual (Page 16)

16 LDS1000 Protocol
3 LDS1000 Protocol
3.1 Interface Parameters
So that the connected instruments (PC) may communicate with the LDS3000, it is
required to set-up the interface parameters on the connected instruments.
The settings for the LDS3000 are:
9600 baud, 8 data bits, no parity, 1 stop bit, No handshake and CR as the end sign.
3.2 Interface Commands
The list is ordered to their functions.
The interface commands are composed of the following parts:
Structure
COMMAND
COMMAND PARAMETER COMMAND PARAMETER,
PARAMETER
: Carriage return (13d)
Example
STOP G10
U24.0
There exist several types of command. The main functions of the leak detector are
in plain text which points to the function. For example, the command "START "
starts the measurement mode. In response to this command, the PC receives "OK
". A list of the main functions is provided in Chapter 1.4.1.1.
Besides this, conditions may be queried through commands which begin with a "S"
for "Status" and which have a parameter attached. A list of all status query
commands is given in Chapter 1.4.1.2.
Measurement quantities can be queried through the command "G" for "Get", for
example: "G1". The LDS 3000 will then respond by outputting the current leak
rate. All measurement quantities which may be queried are listed in Chapter 1.4.1.3.
If the entry of settings is required in the way normally performed through the menus
shown on the Control Unit, the command "U" for "Update" may be used to change
the corresponding parameter. The parameter itself may be output via the serial inter-
face through the command "Q" for "Query". For example, "U 0, 1.0E-04"
changes the
level for the first trigger to 1E-4. The commands used to set and query parameters
are listed in Chapter 1.4.1.4.
Through "Q 0" the trigger level can be read.
Less frequently used functions which normally will only be run for servicing can be
invoked through the command "F" for "Function". For example: "F10" switches
the emission off. A list of these functions is given in Chapter 1.4.1.5.
During servicing the command "V" for "Valves" may be used to switch the valves. For
example: "V 1,0 " opens the internal calibrated leak.