User manual

Computer Gateway User Manual 4-34 5/96
4.4.7
4.4.7 Internal DDT Connect or Disconnect Request
The host processor sends this request to initiate the connect or disconnect of a CG-resident
Internal DDT (input values only) to a specified ACIDP that already has a connected ACP.
It also is used to change "trigger" values for a previously connected DDT.
This DDT to ACIDP connection enables automatic precollection of data from points
specified in the DDT whenever the ACP is to be initiated as the result of a "trigger" event
(schedule, point process special, or operator demand). See paragraph 3 in Appendix C.
Eight-Character Tagname Form
Header information: Word 1—Transaction Code = 45
Word 2—Number of Words = 19
Word 5—CG Identifier = 3
Message format: Word 1—action requested (integer) 0=connect
1=disconnect
2=change triggers
Word 2—Schedule trigger (integer) 0=OFF, 1=ON
Word 3—Point Process Special trigger (integer) 0=OFF, 1=ON
Word 4—Operator Demand trigger (integer) 0=OFF, 1=ON
Words 5..8—ACIDP name (8 ASCII characters)
Words 9..14—ACPROG (12 ASCII characters)
Words 15..19—DDT name (9 ASCII characters + unused byte)
Use information: Same as for the sixteen-character tagname form explained below.
Sixteen-Character Tagname Form
Header information: Word 1—Transaction Code = 145
Word 2—Number of Words = 28
Word 5—CG Identifier = 3
Message format: Word 1—action requested (integer) 0=connect
1=disconnect
2=change triggers
Word 2—Schedule trigger (integer) 0=OFF, 1=ON
Word 3—Point Process Special trigger (integer) 0=OFF, 1=ON
Word 4—Operator Demand trigger (integer) 0=OFF, 1=ON
Words 5..9—reserved for future use (fill with integer zeros)
Words 10..17—ACIDP name (16 ASCII characters)
Words 18..23—ACPROG (12 ASCII characters)
Words 24..28—DDT name (9 ASCII characters + unused byte)