Communication Commands - Metrohm 838 Advanced Sample Processor Manual

2.4.4

Communication commands

SCAN
SCAN
1
Metrohm 838 Advanced Sample Processor, Operation
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.
>sample sequence
7 SCN:Rm :
Rm,RS
8 Bit (1,0 or ∗)
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.
describes a statically set Ready line (Output 0) of a connected
Ready
Metrohm instrument.
Determination, Output line 3).
Setting special binary patterns allows the flexible monitoring of con-
nected instruments. The following applies:
= line inactive
0
= line active
1
= any line condition
*
Example:
00000001
With the LEARN function the binary patterns (=line conditions) can be
adopted interactively (see p. 71).
Scans the Remote
Ready1
interface
Ready1 = Device 1 ready
End1 = EOD impulse device 1
End2 = EOD impulse device 2
Wait1 = Wait for Input2 to be set
(e.g. by 797 VA Computrace)
= Wait for Input4 to be set
Wait2
Wait* = Wait for Input2 and Input4 to be set
Pump1 ? = Wait until pump 1 is running
Pump2 ? = Wait until pump 2 is running
Pump* ? = Wait until pump 1 and 2 are running
any 8-bit binary pattern
or ).
Ready1 End2
stands for a pulsed signal, e.g. EOD (=End of
End
= input line 0 is active =
2.4 Commands
Device 1: Ready1
41