Metrohm 838 Advanced Sample Processor Manual - Manual (Page 49)

2.4 Commands
Metrohm 838 Advanced Sample Processor, Operation 41
2.4.4 Communication commands
The coordination of external instruments or the explicit triggering of
functions is possible via both the Remote interface and the serial RS232
interface. The interfaces can be scanned for particular signal patterns or
incoming data strings. In return, individual signal lines can be set or any
character strings (as control commands) can be transmitted to con-
nected instruments.
SCAN
1
SCAN >sample sequence
7 SCN:Rm : Ready1
Rm,RS Ready1
End1
End2
Wait1
Wait2
Wait*
Pump1 ?
Pump2 ?
Pump* ?
8 Bit (1,0 or ∗)
Scans the Remote
interface
= Device 1 ready
= EOD impulse device 1
= EOD impulse device 2
= Wait for Input2 to be set
(e.g. by 797 VA Computrace)
= Wait for Input4 to be set
= Wait for Input2 and Input4 to be set
= Wait until pump 1 is running
= Wait until pump 2 is running
= Wait until pump 1 and 2 are running
any 8-bit binary pattern
In a sequence the SCN:Rm command will halt the run sequence until
the predefined signal pattern has been received.
Predefined binary patterns are available; these can be selected via
simple names (e.g. Ready1 or End2 ).
Ready describes a statically set Ready line (Output 0) of a connected
Metrohm instrument. End stands for a pulsed signal, e.g. EOD (=End of
Determination, Output line 3).
Setting special binary patterns allows the flexible monitoring of con-
nected instruments. The following applies:
0 = line inactive
1 = line active
* = any line condition
Example: 00000001 = input line 0 is active = Device 1: Ready1
With the LEARN function the binary patterns (=line conditions) can be
adopted interactively (see p. 71).