User manual

Computer Gateway User Manual 4-31 5/96
4.4.5
Sixteen-Character Tagname Form
Header information: Word 1—Transaction Code = 102
Word 2—Number of Words = 18
Word 5—CG Identifier = 1
Word 6—Host Task Identifier = DI
Message format: Words 1..8—ACIDP name (16 ASCII characters)
Words 9..13—reserved for future use (fill with integer zeros)
Word 14—OPER_DMD (integer) 0=OFF, 1=ON
Word 15—PPS (integer) 0=OFF, 1=ON
Word 16—TAKE_I_P (integer) 0=OFF, 1=ON
Word 17—SCHEDULED (integer) 0=OFF, 1=ON
Word 18—PS_MSG (integer) 0=OFF, 1=ON
Use information: The CG resets each of the parameter values represented by words
14 through 18 to OFF upon dispatch of this message in order to
prepare for the next "trigger" event (which may occur while the
ACP is running). The host processor must provide for the event
of this message arriving while the associated ACP is executing.
The ACP needs to examine this data to determine why it was
activated. SCHEDULED is set ON whenever the ACP is to be
executed because of either CYCLIC or PERIODIC scheduling.
PS_MSG is set ON whenever a message for this ACP is being
held at the CG. PPS is defined at heading 2.2.1.3. OPER_DMD,
and TAKE_I_P are defined at paragraph 6.4.
The host processor reaction to this message should include
• Activation of the addressed ACP (passing to it the message
information contained in words 5 through 9.
• Dispatch of an ACIDP execution state change (to run) to the CG.
Note that words 19 through 76 are variable in length and are
significant to certain revisions of CM50S and CM50N. Thus, the
size of the message (contained in header word 2) can vary from 18
to 76 words.