Metrohm 838 Advanced Sample Processor Manual - Manual (Page 16)

2.1 Operating principles
8 Metrohm 838 Advanced Sample Processor, Operation
- Driving the piston to the max. volume
- Compensating for the play between piston and spindle (compen.)
- Valve switching (port)
The first parameter of the DOS command stands for the number of the
dosing instrument (1…3, * = all) and the Dosino port (e. g. 1.1 stands
for Dosino 1, port 1), the second parameter for the function or the vol-
ume to be dosed.
Example:
DOS: 2.1 <ENTER> 4.51 ml <ENTER>
DOS: 2.* <ENTER> <SELECT> ... fill <ENTER>
The dosing and filling rates can be set in the parameter menu.
1
SCAN
Shows the incoming signals or data from the Remote or the serial
RS232 interfaces.
This function is used for checking the data communication with con-
nected devices.
The first parameter shows the selected interface. The second parame-
ter shows the signals or data that are received directly.
If the parallel Remote interface (Rm) is selected then the signal states
of the incoming Remote lines are shown in binary form (1=line active,
0=line inactive).
If the serial RS232 interface (RS) is selected then the data string re-
ceived via this interface will be shown (14 characters per line).
2
CTRL
Controls external devices via the Remote or RS232 interface.
The first parameter sets the interface (<SELECT>). The second pa-
rameter defines the status of the lines (Remote lines) or data (RS232
interface) to be outputted via the selected interface.
2nd parameter, for Remote interface
Binary pattern with 14 digits (0, 1 or ∗) for the 14 output lines or prede-
fined binary pattern (<SELECT> selection), e.g. PUMP R/S 1 , INIT
etc.
2nd parameter, for RS232 interface
Data string with up to 14 alphanumeric characters (any).
The default value "&M;$G" (for starting Metrohm instruments) can be
set with <CLEAR>.
3
WAIT
The <WAIT> key has no function in the normal operating condition. It
is used to insert the WAIT command in a run sequence.