Rockwell Automation 1775-S4B,D17756.5.3 User Manual SCANNER/MSG HND - Manual (Page 127)

Using Report Generation Functions
Chapter 11
11Ć2
Input access functions give you the capability of entering characters into a
procedure during procedure execution. Figure 11.1 shows you the
relationship of the three input access functions to the data terminal
keyboard.
Figure 11.1
Input Access Functions
DATA
TERMINAL
KEYBOARD
INPUT BUFFER
TESTLINE () Ć Specifies a
value of 0 if no carriage return
terminated line is in the input
buffer; specifies a value of 1 if a
line is in the input buffer.
GETCHAR () Ć Specifies
the binary value from the
first character in the input
buffer (no character = 0)
and clears that character
from the input buffer.
TESTCHAR () Ć Specifies a
value of 0 if no character is in
the input buffer; specifies a
value of 1 if a character is in the
input buffer.
These functions work with the inquire command to provide interaction
between the procedure and your input from the keyboard. When you use
these functions or the inquire command, the 1775-S4B scanner stores
characters that are input from the data terminal in the input buffer. The
inquire command waits until all data is entered and [ENTER] is pressed
before continuing procedure execution. The input access functions allow
you to timeout the keyboard while the rest of the procedure continues to
execute. The input access functions include:
Getchar
Testchar
Testline
We describe these functions in the following three sections.
11.2
Input Access Functions