Monitoring Printers With SNMP
If your printer supports SNMP, you can monitor its status. The kind of information provided depends on your printer. Your printer's return values should be numeric.
To set up the monitoring, you have to find an MIB file for your device and use MIB Importer to convert it to an *.oidlib file that works with PRTG. Please see Finding MIB Files and Using MIB Importer for more details.
Once converted, you can create a printer device in the PRTG web interface and set up an SNMP Library sensor on it, using your new oidlib file. Please note that this will only work for the counters that give back numeric values. String values won't be shown.
To use SNMP counters that return string values, please use an SNMP Custom String sensor and enter the OID value for your printer's counter manually (add one sensor for each counter).
You can also use the natively available SNMP HP LaserJet Hardware sensor and the Windows Print Queue sensor.
Monitoring Printers Using the Printer's Web Interface
As alternative: If your printer provides a web page with status messages, you can consider monitoring this web page for certain key words (for example "low toner" or similar) using an HTTP Advanced sensor. This, however, depends very much on the structure and information given on your printer's web page, so we cannot give you further assistance with that.
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For more background information, please see SNMP, MIBs and OIDs - an Overview.
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