HP 3336A - Page 47

Operation
3-26
3-146. Status Bit. The Status Bit Message is sent from a device on the bus to the active con-
troller. It communicates the truth state of a predefined condition which may describe a
specific instrument function or the entire instrument condition. The advantage of the
Parallel Poll is that the status of up to eight devices can be checked at the same time. The
-hp- 3336 does not respond to a Parallel Poll. Refer to the controller documentation or the
documentation of an instrument with Parallel Poll capabilities for more information about
the Status Bit.
3-147. Pass Control. The Pass Control Message transfers the management of the bus from
the system controller to another device with controller capability in the system. The -hp-3336
does not have controller capability. See the controller documentation or the documentation
of a device with controller capability for more information about the Pass Control Message.
3-148. Abort. The Abort Message is used by the system controller to regain control of the
HP-IB from the active controller. See the system controller documentation for more infor-
mation about the Abort Message.
3-149. Trigger. The Trigger Message causes a predefined response in each device receiving
it. When more than one device receives the Trigger Message, the predefined response in all
devices occurs simultaneously. The -hp- 3336 does not respond to the Trigger Message. See
the controller documentation or the documentation of a device capable of responding for
more information about the Trigger Message.
3-150. Remote Operation of the -hp- 3336.
3-151. Data. Almost every function of the -hp- 3336 can be activated remotely by sending
Instrument Programming Codes over the HP-IB. The Instrument Programming Codes are
sent using the Data Message.
3-152. Implementation. Usually, there are several controller statements that will implement
the Data Message. Each statement will have some unique advantage. Thoroughly research
this Bus Message in the controller documentation to be certain you are using the optimum
statement for your application. The syntax and mnemonics for the controller statement
come from the controller documentation. The instrument listen address, which is $ for the
-hp- 3336, and the Instrument Programming Codes come from the instrument documenta-
tion. The Instrument Programming Codes and their format are presented in the paragraphs
that follow.
3-153. Instrument Programming Codes. All of the -hp- 3336 programming codes and their
binary, octal, decimal, and hexadecimal values are presented in Table 3-2. Each program-
ming code is an instruction to the instrument. In most cases, sending these instructions cor-
responds to pressing front panel controls during local operation. For instance, receiving the
ASCII characters AM during remote operation has the same effect as pressing the
AMPLITUDE entry key during local operation. There are exceptions to this one to one rela-
tionship. They are:
All ‘ON/OFF’ and ‘SFAST/SLOW’”’ type controls have separate
ASCII instructions to select each mode.
Model 3336A/B/C