User manual

Computer Gateway User Manual 4-46 5/96
4.6.3
4.6.3 Get Data Return
This message from the CG is in response to either type of Get Data request (message types
3 and 4). The data returned includes both values and value status. The number of words
returned for each point varies by data type (3 for Reals, 2 for Integers, 13 for ASCII
strings, and 5 for Enumerations).
Eight-Character Tagname Form
Header information: Word 1—Transaction Code = 7
Word 2—Number of Words = 5 plus size of data
Word 5—CG Identifier = 2
Message format: Words 1..4—ACIDP name or blank (8 ASCII characters)
Word 5—return status (integer)
0=normal
1=nonexistent table
4=EXECSTAT incorrect
5=complete with errors
10=get-store table empty
16=ACIDP name invalid
28=invalid data access priority
33=invalid data type specified in Internal
DDT
35=Internal DDT purpose not same as
request
36=Internal DDT header number of words
disagrees with table content
37=data type repeated in Internal DDT
38=Internal DDT contains both enumeration
and ordinal data
39=Internal DDT contains over 300 points
40=number of words specified in message
header disagrees with message content
Word 6—start of values for point/parameters (in same order as
contained in the Internal DDT)
Parameter value formats: Real Words 1 and 2—value (real)
Word 3—value status (integer)
Integer Word 1—value (integer)
Word 2—value status (integer)
ASCII String Words 1..12—value (ASCII characters)
(24 characters) Word 13—value status (integer)
Enumeration Words 1..4—value (ASCII characters)
Word 5—value status (integer)
Ordinal Value Word 1—value (integer)
of Enumeration Word 2—value status (integer)