Checking data from serial channel

Robot Controller
1

Is there a way to see if there is data in the serial buffer and if there is not then continue? I have a While loop where I want to see if another piece of equipment has sent data. If it has not then I want to do some other things.

WHILE TRUE DO
szCMDResult := ReadStr(ReadData\Delim:=“-”);

TEST szCMDResult
CASE szTest1:
ENDTEST
!Do something else
ENDWHILE

Thanks

2

So this is what I have come up with. Please tell me if it is stupid and I am just missing something.

I basically catch the error of a time out.

WHILE TRUE DO
szCMDResult := ReadStr(ReadData\Delim:=“-”\Time:=2);

TEST szCMDResult
CASE szTest1:
ENDTEST
!Do something else
ENDWHILE

…

IF ERRNO = ERR_DEV_MAXTIME THEN
TRYNEXT;
ENDIF

Any thoughts?