Addressing
By using the front-panel I/O and SELECT keys, the HP-IB interface can
be placed in either talk only mode (Printer connected to HP-IB) or
addressed talk/listen mode (Controller connected to HP-IB) (see
“I/O
Port Configuration” in chapter
5
of the
HPl65OBIHP 1651B Front-Panel
Reference
manual). Talk only mode must be used when you want the
instrument to talk directly to a printer without the aid of a controller.
Addressed
talk&sten
mode is used when the instrument will operate in
conjunction with a controller. When the instrument is in the addressed
talk/listen mode, the following is true:
l
Each device on the HP-IB resides at a particular address ranging
from 0 to 30.
l
The active controller specifies which devices will talk, and which
will listen.
l
An instrument, therefore, may be talk addressed, listen addressed,
or unaddressed by the controller.
If the controller addresses the instrument to talk, it will remain configured
to talk until it receives an interface clear message (IFC), another
instrument’s talk address (OTA), its own listen address (MLA), or a
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.
Programming Over
HP-18
HP 1650B/HP 1651B
2-2
Programming Reference
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