Metrohm 814 USB Sample Processor - Manual (Page 37)

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3.8.3 Connecting a remote box
Instruments that are controlled via remote lines and/or which send control
signals via remote lines can be connected using the 6.2148.010 remote
box. In addition to Metrohm, other instrument manufacturers also use
similar connectors that make it possible to connect different instruments
together. These interfaces are also frequently given the designations "TTL
Logic", "I/O Control" or "Relay Control" and generally have a signal level
of 5 volts.
Control signals are understood to be electrical line statuses or brief
(
＞ 200 ms) electrical pulses which display the operational state of an
instrument or which trigger or report an event. Sequences on a variety of
instruments can thus be coordinated in a single complex automation sys-
tem. No exchange of data is possible, however.
Proceed as follows:
1 Connect a remote box
￭ Exit the control software.
￭ Connect the remote box connection cable to one of the sockets
marked with MSB on the rear of the control instrument.
￭ Start the control software.
USB 1 Contr. MSB 2 MSB 3
Figure 22 Connecting a remote box
You can, for example, connect an 849 Level Control Box (fill level monitor
in a waste canister) or a 731 Relay Box (switch box for 230/110 volt alter-
nating current sockets and low-voltage direct current outlets). The remote
box also has an MSB socket at which a further MSB instrument, e.g. a
dosing device or a stirrer, can be connected.
You will find precise information concerning the pin assignment of the
interface on the remote box in the appendix (see Chapter 6.3, page 37).