Metrohm 781 pH/Ion Meter: Operation via RS-232 - Manual (Page 6)

1.3 Status messages
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780/781 pH/Ion Meter - Operation via RS232
1.3 Status messages
In order to have an efficient control by an external control device, it must
also be possible to query information on the status of the pH/Ion Meter.
The trigger $D initiates output of the status.
Status messages consist of the global status (e.g. $R) and the detailed
status:
$R.Mode.pH.DriftOk
(measuring pH; drift is OK)
They also may contain error messages:
$R.Mode.T.Drift; E135. (Mode T; drift is not OK; error message
due to missing temperature sensor)
The global status informs on the activity of the process, while the
detailed status conditions show the exact activity within the process.
The following global status conditions are possible:
$R Ready: The pH/Ion Meter has executed the last command and is
ready.
$G Go: The pH/Ion Meter is executing the last command.
$S Stop: A process has been aborted in an "unnatural manner".
e.g. stopped or aborted because there was an error.
1.3.1 Detailed status conditions of the global $R
The process has been concluded in the normal way or has not been actively started.
$R.Mode.pH.Drift : Measuring in pH mode, drift criterion not met.
.DriftOK : Drift criterion met.
$R.Mode.T.Drift : Measuring in T mode, drift criterion not met.
.DriftOK : Drift criterion met.
$R.Mode.U.Drift : Measuring in U mode, drift criterion not met.
.DriftOK : Drift criterion met.
(781 only:)
$R.Mode.Conc.Drift
: Direct measuring in Conc mode, drift criterion not met.
.DriftOK : Drift criterion met.
$R.Mode.Conc.Add.Inac : Add sequence finished in Conc mode.