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Bus Commands
Five types of information are transmitted when the bus is
Command mode (that is, when ATN is asserted):
•
•
•
•
•
Talk addresses and listen addresses were discussed earlier in this appendix.
The other categories are described in the following subsections.
Universal Commands
Universal
whether addressed to listen or not. The commands are listed
Mnemonic
Command
LLO
Local lockout
Universal Device Clear
DCl
PPU
Parallel Poll Unconfigure
Serial Poll Enable
SPE
SPD
Serial Poll Disable
A
Talk addresses
Listen addresses
Universal
commands
Addressed commands
Unaddress commands
commands are
r
ec
Table A-l. Universal Commands
Disables the front panel of the responding device. The REN line
must be asserted in order for lLO to have any effect. If the
instrument is already in Remote mode, the lockout will be
immediate. Otherwise, the lockout will commence when the device
receives its listen address.
All
devices capable ot responding are returned to some known,
device-dependent state. In some cases, a device will perform a
in
self-test
response to a Universal Device Clear.
Directs all devices on the HP-IS that have parallel poll configure
capabilities to not respond to a parallel poll.
Enables Serial Poll mode on Ihe interface.
Disables Serial Poll mode on the interface.
e
e
responding devices
d
iv
by all
Description
Fundamentals
HP-IS
Bus Commands
p
era
ing i n
t
o
the bus
on
in
Table A-I..
35
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