Probleme trigger SNMP V2c

[RomainTiennot]

Hello,
I encounter a problem to add a "Trigger".
The "Trigger" has me up a warning if the value is different from "" (NULL)
Let me explain. I created an item V2c SNMP to monitor a printer ".1.3.6.1.2.1.43.16.5.1.2.1.2"
Return values are either "" if there is no error or "Error (116-324)"

example:
iso.3.6.1.2.1.43.16.5.1.2.1.2 = STRING: "Error (116-324)" <<< ERROR
iso.3.6.1.2.1.43.16.5.1.2.1.2 = "" <<< OK

I do not find a way to make an SNMP alert
Can you help me?

(Sorry for my english) ..

Roman

[RomainTiennot]

This is resolved.
I changed the type of data received in the configuration of the item in DATA.

Thx
Romain