HP 3336A Operating Manual page 42

Model 3336A/B/C Operation
3-123. Step One. Choose one of the Bus Messages for conversion. Begin with the System
@ Management Messages since they are usually easier to convert to controller statements than
the Trigger or Data Messages. Locate the description of the Bus Message in this manual. The
description of each message contains the following information as applicable:
—the response of the -hp- 3336 to the message.
—~the device dependent information required for the controller statement.
—any prerequisite operations.
—suggestions for optimizing the use of the message.
The device dependent information required for the controller statement is always found
-under the heading Implementation.
NOTE
1. The Require Service Message originates at the instrument
rather than at the controller. Consequently, there is no controller
message that implements this message. This does not diminish the
importance of this message to the operator. Study it carefully in
turn.
2. The Status Bit, Pass Control, Abort, and Trigger Messages
can not be implemented because the -hp- 3336 does not have the
capacity or the need to respond to them.
3-124. Step Two. Find the description of the selected Bus Message in the controller
documentation. This description usually consists of the following information:
© —one or more controller statements that implement the message.
—mnemonics for the controller statements.
—syntax of the controller statements.
—suggestions for optimizing the implementation of the message.
3-125. Step Three. Integrate the device dependent information, found in Step One, with the
controller dependent information found in Step Two. The syntax of the controller statement
explains how this should be done.
3-126. Step Four. Record the statements that implement each Bus Message in Table 3-1 as
they are found. The operator needs to translate the Bus Messages only once. Table 3-1 can
be used as a quick reference when writing programs in the future and should be included in
your system documentation.
3-127. When searching for a message in the controller documentation, it is usually best to
start with the Table of Contents. If the message is not referenced there, look in the Index. In
order to use the twelve bus messages, the controller documentation must organize the In-
put/Output Operation programming statements according to the definitions of the twelve
messages. It would be unusual for any manufacturer of controllers to do otherwise. The ex-
act nomenclature, however, used to describe the Bus Messages may vary from one manufac-
turer to another. -
NOTE
& If your controller documentation does not contain a program-
mable statement for a particular Bus Message, the controller may
not be capable of implementing the message.
3-21