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Talk only mode must be used when you want the system to talk directly to a
printer without the aid of a controller. Addressed talk/listen mode is used
when the system will operate in conjunction with a controller. When the
system is in the addressed talk/listen mode, the following is true:
•
Each device on the HP-IB resides at a particular address ranging from 0 to
30.
•
The active controller specifies which devices will talk and which will listen.
•
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)
•
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)
•
a universal unlisten (UNL) command.
HP-IB Bus Addressing
Because HP-IB can address multiple devices through the same interface card,
the device address passed with the program message must include not only
the correct instrument address, but also the correct interface code.
Interface Select Code (Selects the Interface)
Each interface card has its own interface select code. This code is used by
the controller to direct commands and communications to the proper
interface. The default is always "7" for HP-IB controllers.
Programming Over HP-IB
HP-IB Bus Addressing
2–4
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Содержание HP 16500B
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