Chapter 9 Optional Equipment
Instrument Status Outputs
Several instrument status outputs are available on the rear panel I/O connector via reed
relays on the I/O Board. The reed relays are arranged as shown in Figure 9-6. In the
instrument status output truth table, each pin is referred to as open or closed (based on the
physical position of the corresponding relay). The Relay Common line is common to
each of the relays. The relays can be set to either normally open or normally closed. The
following tables and figures are with the relays set to normally open. If the relays are set
to normally closed, reverse the logic of the tables (i.e. open becomes closed and closed
becomes open).
Figure 9-6.
Instrument Status Output Relays
9-8
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