IAI PSEL, Operation Manual

Page: 712 / 1062

4. Program Edit
218
4.2.4 Specification Method for Local String and Global String
RS232C serial communication is implemented basically by means of exchange of character
strings.
These character strings are called “string”.
Strings sent in the communication transmission format can be used freely in programs, or
specifically they are stored in boxes (columns) in which strings are placed.
These string are classified into global string that can be read or written in all programs, and
local string that can be read or written only in each program.
String are differentiated by the range of their number.
Column number
Global string 300 to 999 (700)
Local string 1 to 299 (299)
The characters constituting a string are stored one by one in each of these fields.
The position of a given field in a string is expressed by column X, and the column to store
each character in can be set freely using a command.
Column
Local strings
299
Column
Global strings
700