Metrohm 796 Titroprocessor - Manual (Page 206)

8.13 Communication functions
796 Titroprocessor, Instructions for use 200 200
8.13 Communication functions
³COMM >³
³AUX ЪДДДДДДДД¿
АДДДДДДДД³
SCAN_RM ³
³CTRL_RM ³
³CTRL_RS1³
³CTRL_RS2³
³SCAN_RS1³
³SCAN_RS2³
³PRINT ³
³KEYCTRL ³
АДДДДДДДДЩ
Complex applications require the optimal cooperation between various
instruments and components. For this reason the 796 Titroprocessor is
provided with special commands. These commands allow synchronization
and data communication between instruments which have a parallel remote
connection or a serial RS 232 interface.
The two commands CTRL and SCAN are important for the cooperation of
the 796 Titroprocessor with other instruments. They can also be used in
combination with instruments from other manufacturers provided that the
interface specifications of these are known.
8.13.1 Application mode of operation of CTRL and SCAN
The CTRL command sends the preset data without delay via the selected
RS 232 interface to a connected instrument or sets the predefined condi-
tions of the output lines (
Output 0…7 or …13) of the selected remote con-
nection.
The SCAN command stops the method run and checks (scans) the in-
coming data at one of the two RS 232 interfaces or the conditions/signals of
the input lines (
Input 0…7) of a remote connection. The method run will be
continued as soon as the defined data have been received or the incoming
signals correspond to those set down.
8.13.2 Remote connections
Most Metrohm instruments have a remote connection (D-sub, 25-pins),
which is provided for external control of the instrument. By setting particular
input lines various functions (start, stop etc.) can be triggered or different
measuring modes activated. At the same time the instrument signalizes its
instrument status or status change or certain events by activating its various
output lines.
The remote functions most often required for Metrohm instruments:
Function Line Status
Start Input 0 active
Stop Input 1 active
The status signals most often required for Metrohm instruments:
Signal Line Status
Ready Output 0 active
End of Determination Output 3 active (impulse)
Error Output 5 active