Metrohm 711 Liquino - 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 <ALPHA> key, see also page 66.
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