Metrohm 711 Liquino User Manual
Page 92
4.5 SEQ mode - complex processes
711 Liquino, Instructions for use
86
RS232 connection:
Data (=character strings) can be sent to connected instruments
via the serial RS interface.
Make sure that the transmission parameters of the RS232 inter-
face agree with those of the connected instrument (see configura-
tion menu >RS232 Settings, page 21).
Any combination of letters, numbers and special characters can
be selected from the Liquino character set. To enter letters and
special characters press the
This function is particularly suitable for instruments with the
Metrohm remote control language. Metrohm instruments can be
controlled with so-called triggers.
The most important of these are:
&M;$G
Go, start instrument in current mode
&M;$S
Stop, stop instrument
&M;$H
Hold, interrupt determination
&M;$C
Continue, restart determination
Details about the Metrohm remote control language can be found
in the ’Instructions for use’ of the corresponding instrument.
•
SCAN — this command has the effect of stopping the sequence. In
order to continue the sequence a particular signal pattern at a remote
connection or the receipt of a defined character string via an RS232
connection is necessary. The corresponding instrument interface can
be selected.
Remote connection:
Eight input lines are available for communication with external in-
struments. Five of these (Input3…7) can be scanned with the
SCAN command. Lines Input0 to Input2 are reserved for the func-
tions START, STOP and HOLD/CONTINUE.
The condition of the input lines (e.g. the status of the ready line to
scan for the titration end at the Titrino) is compared with a prese-
lected bit pattern. Each bit corresponds to an input line.
Input 7 6 5 4 3 2 1 0
Bit 7 6 5 4 3 2 1 0
(Bits are always numbered from right to left)
Example:
command: SCAN
i nt er f ace: Remot e
pat t er n 0* * * 1- - - (lines 0…2 are reserved)
The above command expects an active input line 3 (1=set). This
line is set, e.g. by a Titrino, after a titration has been ended and
the Titrino can again accept a start signal. A precondition is that
the remote cable 6.2141.090 is used.
Line conditions:
0 = inactive (high)
1 = active (low)
* = as chosen