Metrohm 774 - Page 58

5 Detailed description
774 Oven Sample Processor, Instructions for use
52
Key Normal state Editing
1
SCAN
Display input signals
• Display of the incoming signal
or data on the remote or RS
interface. This function serves
to control the data communi-
cation or states of connected
instruments.
• The first parameter represents
the interface selection. The
signals for data being re-
ceived at that moment are
displayed as the second pa-
rameter.
• If the parallel remote interface
(Rm) is selected, the signal
states of the incoming remote
lines are displayed in binary
form. (1=line active, 0=line
inactive). Further details relat-
ing to this are on page 78ff.
• If the serial RS 232 interface
(RS) is selected, the charac-
ter string being received, is
displayed line by line (14
characters). Details relating to
this are on page 96ff.
Numerical entry
or
Scan input signals
• In a sequence the SCAN
command causes method
processing to stop until the
predefined bit pattern (with the
remote interface) or the given
character string (with the RS
232 interface) is received.
• Predefined bit patterns are
available for the remote inter-
face and can be selected via
simple short-names (for ex.
“ready1” or “end1”).
• Character strings consisting of
14 ASCII characters may be
defined with the
RS 232 interface. Use text edit
mode.
2
CTRL
Interface control
• Controlling of external instru-
ments via the remote and RS
232 interface. This function is
used for data communication
with or control of connected
instruments.
• The first parameter stands for
the selection of the interface.
The second parameter defines
the state of the remote output
lines or data to be transmitted
via RS 232 interface.
Parameters with remote inter-
face selected
• Bit pattern with 14 digits (0, 1
or *) for the 14 output lines or
predefined patterns accessi-
ble by the <SELECT> key (for
ex. "START device1", "STOP
instr.1" etc.).
Numerical entry
or
Interface control
• Setting the 14 signal lines of
the remote interface or sending
a character string via the RS
232 interface to control instru-
ments connected.
• Predefined bit patterns are
available for the remote inter-
face and can be selected via
simple short-names (for ex.
“START instr.1” or "STOP de-
vice2").
• Character strings consisting of
14 ASCII characters may be
defined with the RS 232 inter-
face. Use text edit mode.