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Communicating s
Over the HP-IB
Bus (HP 9000
Series 200/300
Controller)
Local, Remote,
and Local
Lockout
Programming Over HP-IB
2-2
If the controller addresses the instrument to talk, it will remain configured
to talk until it receives an interface clear message (IFC), another
address
instrument's talk
universal untalk (UNT) command.
If the controller addresses the instrument to listen, it will remain
configured to listen until it receives an interface clear message (IFC) its
own talk address (MTA), or a universal unlisten (UNL) command.
card, the device address passed with the program message must include
not only the correct instrument address, but also the correct interface
c o d e .
Interface Select Code (Selects Interface). Each interface card has its own
interface select code. This code is used
commands and communications to the proper interface. The default is
always "7" for HP-IB controllers.
Instrument Address (Selects Instrument). Each instrument on the
HP-IB port must have a unique instrument address between decimal 0
and 30. The device address passed with the program message must
include not only the correct instrument address, but also the correct
interface select code.
DEVICE ADDRESS = (Interface Select Code) X 100 + (Instrument Address)
For example, if the instrument address for the HP 1652B/53B is 4 and the
interface select code is 7, when the program message is passed, the
routine performs its function on the instrument at device address 704.
The local, remote, and remote with local lockout modes may be used for
various degrees of front-panel control while a program is running. The
instrument will accept and execute bus commands while in local mode,
and the front panel will also be entirely active. If the HP 1652B/53B is in
remote mode, the instrument will go from remote to local with any front
panel activity. In remote with local lockout mode, all controls (except the
power switch) are entirely locked out. Local control can only be restored
by the controller.
(OTA), its own listen address (MIA), or a
by
the controller to direct
Programming Reference
HP 16528/1653B
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