Rockwell Automation 1775-S4B,D17756.5.3 User Manual SCANNER/MSG HND - Manual (Page 128)

Using Report Generation Functions
Chapter 11
11Ć3
Definition: To search the data terminal input buffer for a character.
Abbreviation: G
Format: G()
Description: The getchar function returns the binary bit pattern of the first
character in the input buffer. The 1775-S4B scanner reads the decimal
value of the character and clears the character from the input buffer.
Commands and operators can use this value specified by the getchar
function. Refer to table 9.D for the binary conversion information. If no
character is in the input buffer or if you enter a NUL character, the getchar
value is zero.
Example using the getchar function:
If you enter:
IF (G().EQ. 65) @MP_A
The 1775-S4B scanner executes procedure @MP_A if the first character
entered is decimal 65 or the ASCII character A.
Definition: To test the data terminal input buffer for a character.
Abbreviation: TESTC
Format: TESTC()
Description: The testchar function tests the input buffer for a character
and returns one of the following values:
If the value is: Then the input buffer:
1
0 Contains a character
Is empty
The testchar function does not clear a character from the input buffer.
Commands and operators can use this value specified by the testchar
function.
11.2.1
Getchar
11.2.2
Testchar