User manual

Computer Gateway User Manual 4-39 5/96
4.5.1
Sixteen-Character Tagname Form
Header information: Word 1—Transaction Code = 106
Word 2—Number of Words = 9 + total for external
name/parameter sets (21 words each)
Word 5—CG Identifier = 2
Message format: Word 1—start of external data table
Data table format: Word 1—table purpose (integer) 1=input table
2=output table
5=history query table
Words 2..5—order of data types in table (integer)
0=no entries
1=real
2=integer
3=ASCII (24-character string)
4=enumeration
*
(ASCII string)
OR
5=enumeration (ordinal value)
13=internal entity id
15=external entity id (ASCII name)**
17=LCN internal time
19=ASCII (40-character string)
These ordering values can be assigned in any sequence; however,
none of the data types can be repeated, and you cannot have both
enumeration and ordinal types in the same DDT.
Words 6..9—number of points of each type (integer array)
These values must be presented in the same order as in words 2
through 5.
Word 10—start of 10-word external name/parameter sets
Name/param set format: Word 1—LCN PIN node ID (2 ASCII characters)
Words 2..9—point name (16 ASCII characters)
Word 10—point name index (integer)
Words 11..14—parameter name (8 ASCII characters)
Word 15—parameter index x (integer)
Word 16—reserved for future parameter index y (integer)
Words 17..21—reserved for future use (fill with integer zeros)
___________________________
*
See Paragraph 4.6.4 for restrictions on the use of Enumeration values in Store Data requests.
**Store (output) of external entity id (ASCII name) is not permitted.