Local lockout prevents the control
settings
of the
instrument being altered by
unauthorized
use of the
front panel.
Fig.
7.7 shows
the
relationship of local lockout
to
the remote
and local states
previously
shown
in Fig. 7.6.
As in Fig.
7.6,
a GO TO
LOCAL command
from
the
controller reselects the local
state
previously in
use.
The
local lockout
state
is cancelled when
the REMOTE ENABLE signal from the
controller is negated, i.e. when the controller
sends NOT REN.
5.2
COMBINED USE OF RS 423 AND GPIB
DEVICES
The instrument can
be used
in a system containing
both GPIB and RS423 compatible
devices.
For example, the GPIB controller
could be a calculator with no recording capability,
whilst
the RS 423 device could be
a
tape
cassette unit, or
a
printer with no keyboard.
Data
requested by the GPIB controller,
e.g. measurement results, are output also
through
the serial interface, provided that DATA
OUTPUT for RS 423 is enabled.
Conversely,
if the instrument is set
to talk only, and is connected to
a
listen
only
printer
or plotter, data requested through the
serial interface is sent also to the GPIB,
provided that DATA OUTPUT for the GPIB is enabled.
However,
if the instrument is set for operation
as a talker/listener, data requested
through
the serial interface does not appear
on the GPIB.
7.18
JWS/1260/2
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