SSH Script Advanced Sensor, string return value not displayed

Hi

I have here a SSH Script Advanced Sensor for monitoring a asterisk with a script.

I have on some return values from the digium cards a string instead a number.

Can i use string and display them in PRTG where i can set an alarm on it like:

- OK = Green
- Yel = Warning
- Red = Alarm

?

Here a part of the script, that gives a integer back for the moment:

# Check DIGIUM Card Port 1
DIGI1=$(asterisk -rx "dahdi show status" | sed -n '2p' | cut -d " " -f 22)
echo -n "<result>
       <channel>DIGIUM Port 1 Status</channel>
         <value>"
if [ "OK" = "$DIGI1" ]; 
then
	echo "1"
else
	echo "-1"
fi
echo "</value>
		 <unit>custom</unit>
		 <customunit></customunit>
</result>"

asterisk linux ssh-script-advanced-sensor