Metrohm 730 Sample Changer - Manuel (Page 130)

4.9 Operation via RS232 Interface
730 Sample Changer, Detailed Description
127
4.9.3 Triggers Triggers
Triggers initiate an action on the 730 Sample Changer, for exam-
ple, starting a process or sending data. Triggers are marked by
the introductory symbol $.
The following triggers are possible:
$G G o Starts processes, e.g. starting the mode run or setting the RS232
interface parameters
$S S top Stops processes
$Q Q uery Queries all information from the current node in the tree forward
up to and including the values
$Q.P P ath Queries the path from the root of the tree up to the current node
$Q.H H ighest Queries the number of son nodes of the current node
Index
$Q.N"i" N ame Queries the name of the son node with index i, i = 1...n
$D D etail-Info Queries the detailed status information
$U qUit Aborts the data flow of the instrument, for example, after $Q
The triggers $G and $S are linked to particular objects, see the
summary table page 130ff.
All other triggers can be used at any time and at all locations on
the object tree.
Examples:
Querying the value of the baud rate: &Config.RSSet.Baud $Q
Querying all values of the node: RSSet: &Config.RSSet $Q
Querying the path of the node: RSSet: &Config.RSSet $Q.P
Start mode: &Mode $G
Querying the detailed status: $D
4.9.4 Status and Error Messages
In order to have an efficient control by an external control device, it must also be pos-
sible to query status conditions. They provide information about the status of the sam-
ple changer. The trigger $D initiates output of the status. Status messages consist of
the global status, the detailed status and eventual error messages. The global status
informs on the activity of the process, while the detailed status conditions show the
exact activity within the process.