Metrohm 731 Relay Box - Manual (Page 16)

2. Installation
Relay Box 731, Instructions for use 10
2.4 Connections
Metrohm automated systems with the 731 Relay Box
Remote
Out
Dosimat
Titrino family
665
715
725
765
775
776
pH Meter /
Conductometer
691
692
712
713
718
719
720
736
751
758
702
716
711 Liquino
Remote
In
726
730
717
730 Sample Changer
717 Sample Changer
726 Titroprocessor
DC1
DC2
AC1
AC2
772 Pump Unit
other
devices
Pumps
Heaters
...
731 Relay Box
Valves
2.4.1 Remote control via remote lines
Remote control of instruments within a Metrohm automated system
can (apart from data communication via RS232 connections) be
carried out in a simple manner with the help of parallel-switched sig-
nal leads, the remote lines (or I/O lines). Signals can be set statically
or transmitted as a signal pulse (usually approx. 200 ms long). The
signal level is +5 volt (TTL level) in each case.
Most Metrohm instruments are fitted with a remote connection. This
is normally a 25-pin socket. Different connection cables are available
for different types of instrument. The suitable remote cable is listed in
the ‘Instructions for use’ of the corresponding instrument. Special
connection cables can also be made according to information sup-
plied by the customer.