An Instrument - HP 5890 Series II Plus Reference Manual

Signal Output
Instrument network (INET)
configuration, consult appropriate manual(s) for the controller device
(the HP 5890 is never a controller).

An instrument

Addresses
An instrument is a device, housing together a collection of functions,
and having a single model number. It has a single pair (IN and OUT) of
INET cable connections.
The INET controller assigns each instrument a unique address, in order,
around the loop. Thus, addresses correspond to the physical order of
connections around the loop.
Note that the controller usually is also an instrument in that it has
capability of performing various analytical tasks (for example,
integration).
Data or a command message destined for a particular instrument is
labelled with the corresponding address for the instrument.
Setpoints
The controller passes setpoints among INET instruments (including
itself), and to and from local storage. Setpoints are grouped according to
the instrument to which they belong, and labelled with the
corresponding INET address. Setpoint traffic is automatic, once
appropriate commands are entered at the controller.
If an instrument receives setpoints intended for a different instrument
because of an address error, it rejects them, causing the controller to
print an error message.
Generally, each instrument provides a means for entering its own
setpoints (i.e., a keyboard or control panel). The HP 19405A S/ECM is an
exception: its setpoints are defined through the controller.
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