Rockwell Automation 1775-S4B,D17756.5.3 User Manual SCANNER/MSG HND - Manual (Page 129)

Using Report Generation Functions
Chapter 11
11Ć4
Example using the testchar function:
If you enter:
IF (TESTC()) G LABEL_2
In the command line above, if a character is in the input buffer, the
1775-S4B scanner executes the goto command.
Definition: To test the data terminal input buffer for a complete line.
Abbreviation: TESTL
Format: TESTL()
Description: The testline function tests the input buffer for a line. The
1775-S4B scanner defines a line to be one or more characters followed by
a carriage return. The testline function returns one of the following values:
If the value is: Then the input buffer:
1
0 Contains a line of data terminated by a carriage return.
Does not contain a line terminated by a carriage return.
The testline function does not clear a line from the input buffer. Commands
and operators can use this value specified by the testline function.
Example using the testline function:
If you enter:
IF (TESTL()) IN US_6
In the command line above, if a line is in the input buffer, the 1775-S4B
scanner executes the inquire command.
11.2.3
Testline