Interface Operation
79
Remote/Local Operation
The IEEE488 interface defines separate “REMOTE”
and “LOCAL”
states.While in the LOCAL
state, which is following the initial application of
power, the instrument will only respond to commands from the instrument’s
front panel. Placing the instrument in the “REMOTE”
state by way of the
defined interface command, the instrument will only respond to commands
received via the interface or until released into the “LOCAL”
state by the
defined interface command. In either state, the instrument’s present status can
be read by the interface.
If the instrument is in the ‘REMOTE”
state and “LOCAL LOCKOUT”
has
not been commanded, then press the MNU key to return the instrument to the
“LOCAL”
state.
Address Selection
When the IE-BAT option is fitted, an additional item is available from the
MNU
key, this is the selection of the interface address. This is accessed by
pressing the MNU
key on the front panel. The last menu selection (press
either the MNU
key or any of the arrow
keys until this selection is displayed)
will be the prompt to change the IEEE488 address, if this is selected (by
pressing any of the Units/Enter keys) then the present address will be
displayed and the user may enter a new address by pressing the arrow
keys
until the desired address is shown. Press any of the Units/Enter keys to select
the displayed address or press the MNU key to abort the entry.
IEEE488 Handshake Lines
All the timing requirements of the bus interface are handled by the hardware
handshake system used by the IEEE488 interface. During decode of a
command all further received data are held-off by this hardware handshake
until the decode has been completed. If you want to synchronize the activities
of the controller and the 2000 instrument in this respect, then use the
SRQ
capabilities of the 2000 instrument. Additionally note that a two-second delay
is forced between sending a Device Clear (either DCL or SDQ bus command)
and sending data to the 2000 instrument.
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